2600-3200rpms, it slowly goes to about 190*. Increase initial timing - We recommend 14 to 18 degrees initial timing. Twenty Reasons Why Your Engine is Overheating In this Truck Radiator guide we are going to go over 20 reasons why your engine may be overheating. 0l starter 2006 mercruiser 5. 305 and 350. I didn't bother increasing throttle to he point tat the temp rose to hot, it thing the cause of the high RPM overheat has been discovered - now on to finding and repairing the root cause!. 7 is doing the same thing. Your Clymer Manuals MerCruiser Alpha One, Bravo One, Two and Bravo Three Stern Drives, 1995-1997 B744 online manual is viewable with a magazine reader and features the same content as the printed manual. Slowly remove the radiator filler cap when the engine has completely cooled. overheating. Portable and easy. Overheating can also be caused by a worn or damaged water pump impeller. Wide open throttle RPM range chart for Mercruiser powered boats. 0 mercruiser for a run today and when i stoped saw smoke and strait away realised i left the earfuffs on so it was extreamly hot so took boat out of water let it cool down i let it run with water in the yard for a wile there is no knocks or odd sounds but gets hot and. 4 liter inboard oil for mercruiser 7. Most cases of overheating are caused by failed sea water intake pumps. It will either start and idle fine, then stall or spit back through the intake when you accelerate hard, or it will take FOREVER to start and then run 95% clean at high idle to redline. When your AC compressor kicks in or power steering is activated as you suddenly turn the steering wheel, the sudden drag o. Inboards, Bravo, TRS and all the Speedmaster drives have a separate intake pump on the engine. Any good Fresh Water Cooling System should have excess cooling capacity. 1-liter engine has a notorious weakness, a failure mode that GM will not cover after the warranty expires. We're talking about engines that start easily and accelerate smoothly, but then, after a few minutes at a steady speed, either surge in speed or misfire, causing the car to "buck. You have the heads off so at least look at an intake valve but all caution sport - saving only $110 for marine work some is easier some aggravated by harsh use, fresh or ambient water cooled issues plus improper off season storage as applicable. I purchased a boat with what ended up being a blown 1989 Mercruiser 4. 2001 f350 transmission overheating. Alternator faq, frequently asked alternator questions answered, Understanding alternators. The Chevy 3. 0L 350 CID 5. We recommend upgrading. 0 liter V8 engine, it's important to inspect both mechanical and cooling system components. To summarize, at idle, no bubbles, at plane speed, (sorry, tach is broken) guessing 2000-2500 RPM, the bubbles are fast and furious. 99 vw beetle overheating. 0ltr engine how to install boat propeller shaft on a 90 hp 4stroke yamaha motor tool belt df70 suzuki how to adjust the idle speed on a 1995 mercury 90 hp outboard motor 1988 evinrude 30 overheating 2003 mercruiser 7. A special procedure must be followed to adjust idle rpm. In practical terms, the position of the distributor which yields the highest idle speed is within a very few degrees of where it should be set. 3L MerCruiser is overheating. Even at idle. Could scale in the block and heads be the cause? Any way to treat this, besides tearing it all down? Thanks for the help. I am having an issue with my boat overheating at idle or in drive at the lowest speed (650-800rpm). High Output Alternator Frequently Asked Questions. 0L/LX ALPHA ONE ENGINE. 7L, 350 MAG, 7. It overheats when under load, ie when planning at around 3500 rpm, below this at 1500 rpm the temp stays constant at 140-160'. 1 overheat; mercruiser 7. 2l mpi 2,006 oil pressure; mercruiser 7. DOWNLOAD MerCruiser engine and sterndrive repair manuals straight to your computer in seconds—fix your problems now. The Y38-4 and Y38-4A remanufactured Two Barrel MerCarb Carburetors have one idle mixture screw with the gas inlet next to the electric choke. It can be a temporary problem such as weed or debris wrapped around your lower unit. 2003 jetta overheats at idle. CP Performance is the world's leading marine mail order superstore for all your performance boating needs! We carry the finest selection of Performance Marine Parts, as well as a large library of technical information to help you get your boat working in the finest order!. 2L 502 MAG Horn Output Possible Cause Corrective Action Engine Usage Available For Consumer Key on, engine not running. Mercruiser 260 overheating. garage in Havasu for the season with no overheating alarms. 3 overheating at idlemercruiser 4. Hello, I own a 1987 Volvo 740 GLE wagon with an automatic transmission. Impellar need replaced? Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. MerCruiser 454 over heating cooling thermostat troubleshooting. The consequences of an “open failure” may be less catastrophic than those of a “closed failure”. 2 horizon overheats my 3 0l my mercruiser is overheating on mercruiser 350 mag could water in fuel filter cause overheating at idle one side of 5l v8 mercruiser overheating overheated rough running mercruiser overheating 15hp evinrude overheating 4. I purchased a boat with what ended up being a blown 1989 Mercruiser 4. The Causes of Internal Engine Knock, and How to Eliminate it. 0 repair manuel 1990. 2) Loss of power. 7 problem with 496 mercruiser 8. Another telltale sign of your coolant temperature sensor not functioning properly is if your engine is overheating frequently. New T stat 140, clear oil cooler, new aluminum headers. I had the dealership replace the manifold gasket the first time at about 40,000 miles before it got to. Shop for an idle air control valve at your local AutoZone store or online, and benefit from our customized selection. CP Performance is the world's leading marine mail order superstore for all your performance boating needs! We carry the finest selection of Performance Marine Parts, as well as a large library of technical information to help you get your boat working in the finest order!. Bruce Recently returned from long trip and our 87 Coachmen started running rough under load. We offer premier Marine brands from Tohatsu, Volvo Penta, GM Marine, Marine Power, Mercury, Crusader Engine and more. Overheating issues are classified as 'overheating engine mechanical,' 'engine overheats cooling system,' or a combination of both. Once the idle circuit has been tuned it is time to direct attention to the main metering circuit. Problem CONDITION POSSIBLE CAUSE CORRECTION 7) Idle cut-off solenoid not working. 4 l mercruiser overheats at idle; 99 mercruiser 5. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury 115 hp outboard engines were designed primarily for factory service Mercury 115 hp outboard technicians in a properly equipped shop. 7) Check idle solenoid, especially for power/ground, replace solenoid if necessary. 7 water in cylinders; 1987 mercruiser manual; 1995 mercruiser 5. 7 I idle mine at 600 and never have had a problem. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer. Probably better sites for this - but I just like this forum so much. To place an order please use our secure online ordering. 4 mpi overheating v8 magnum 7. The prop spins in one direction causing the motor pull to one side, making steering tiring. 1995 cruiser 2470 overheating troubleshoot; mercruiser 5. I've just bought a second hand mercruiser seacore engine, 5. Volkswagen Jetta Engine Overheating Due to Damaged Water Pump Impeller - 85 reports. Family Marine. I have brought the boat into my local mercruiser dealer and we have not been able to overcome the problem, even with tech support from Mercruiser. The Chevy 3. The prop spins in one direction causing the motor pull to one side, making steering tiring. I'm having problems with my 1992 MerCruiser 4. Volkswagen Jetta Engine Overheating Due to Damaged Water Pump Impeller - 85 reports. We specialize in Volvo Penta Volvo Penta engines, outdrives, propellers, and other accessories, but we also carry MerCruiser, PCM, Cummins, Perkins, etc. 0 overheating idle, 1998 7. I had the dealership replace the manifold gasket the first time at about 40,000 miles before it got to. Overheating 85. 50 or numerically-higher rear gears. Idle to about 2600 rpms the temp is ok. Is the Idle speed screw adjusted to achieve an IAC Position of about 5% at hot idle? Perform another TPS Autoset, whenever you adjust the idle speed screw on the throttle body. I have a 2006 Sea Ray 240 Sundeck with Mercruiser 350 MAG MPI and Bravo 3 Drive. 0ltr engine how to install boat propeller shaft on a 90 hp 4stroke yamaha motor tool belt df70 suzuki how to adjust the idle speed on a 1995 mercury 90 hp outboard motor 1988 evinrude 30 overheating 2003 mercruiser 7. The last couple of times I have hooked up the "earmuffs" to the lower unit to flush the engine its almost like there's an airlock of some sort, and after a while I get the overheat alarm. 00 gear ratio. Overheating was experienced at low rpm but rev up above idle and it was ok. Due to the location of marine engines - enclosed in a boat - there is little air flow to help cool the engine after the combustion air is sucked into the engine. Improper repair to a MerCruiser engine can render it unsafe or result in further damage. A low engine-coolant level or poor radiator hose connection can lead to an overheating vehicle with a 7. While coolant leaks lead to the engine overheating, air leaks lead to reduced performance. powered by smf consumer credit counseling service of maryland. Step 1 - The idle air control valve is located on the throttle bore (in most cases) and is designed to adjust engine air intake at idle which. 4 possible reasons for 454 7. INSTANTLY DOWNLOAD outboard repair manuals straight to your computer in seconds. 0 service manual; mercruiser 1 7 dti service manual; mercruiser 4. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. big bore hayabusa overheating. Does the repeated throttle lever pumping prime the system with fuel? With the previous 120 engine, a previous owner put a fuel primer bulb in the fuel line, so I always gave the primer bulb a few squeezes before attempting to start it. 0 liter on a '95 Four Winns. 7 L engine that is overheating, Changed impeller and thermostat. But with the proper tools, adjusting your ignition. 3L Alpha One 4. 7 problem with 496 mercruiser 8. Volkswagen Jetta Engine Overheating Due to Damaged Water Pump Impeller - 85 reports. INSTANTLY DOWNLOAD outboard repair manuals straight to your computer in seconds. 0 Leaking idle air control (IAC), intake manifold or throttle body. At idle speed, my boat lists from left to right, and eventually goes in a circle. 4 mpi service manual oil pressure at idle 7. 2L, GM V8 305-350-454-482-540 CID. 0 mpi spark plugs; mercruiser factory repair manual; mercruiser overheating at idle; mercruiser. Too restrictive of exhaust system. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surging. Re: 87 Mercruiser overheating at idle (under 1000rpm) OK, I back flushed and then ran the boat with the muffs on and the supply hose off - dumping into the bilge. It will either start and idle fine, then stall or spit back through the intake when you accelerate hard, or it will take FOREVER to start and then run 95% clean at high idle to redline. Rough Low Idle and Engine Shakes, Hesitation and Lack of Power During idle and leak from fuel injector • Engine overheating • A/C system improperly. 4 idle issues I have a 97 Mariah Z210 and it performs similarto yours. How to Winterize Your Mercruiser. When attempting to diagnose an overheating MerCruiser 5. after taking the gas cap off and pushing the fuel rail valve. It is reliable and usually the annual maintenance performed during winter layup will prevent overheating problems. The reason I ask is one is throttle body and the other is multi port. Why is my mercruiser 454 engine overheating. Brought an IR thermometer with me. The prop spins in one direction causing the motor pull to one side, making steering tiring. 7 water in cylinders; 1987 mercruiser manual; 1995 mercruiser 5. Engine Overheats (Mechanical) 2. freightliner fl70 overheats. The HP500 continues to provide flawless performance as the exclusive power of the APBA's exciting Factory V-Bottom Series. 90-863757--1 DECEMBER 2001 2001, Mercury Marine PCM 555 DIAGNOSTICS SN 0M000000 and ABOVE SERVICE MANUAL 2. 3L Alpha One 4. The shutters can start making a "clakity" noise. This troubleshooting guide will focus on actions needed to correct engine overheating issues for MerCruiser Inboard motors. The description and specifications contained herein were in effect at the time this guide was approved for printing. marquis spa overheats. I have a 88 3. The overheat occurs at idle-1500 rpm. Idle mixture screws in too far causing extreme lean condition at idle. Question of the day. 2l alternator; mercruiser 6. It has a Rochester 2bbl carb that is different to any other Rochester 2bbl shown in my Mercruiser repair manual so that dosent help much. 7 Mercruiser sterndrive raw water cooled. A downloadable repair manual is a digitally delivered book of instructions providing step-by-step repair procedures, maintenance and a troubleshooting guide. Me&wiser 470, 485, 488, 17OMR and19OMR This chapter covers theMerCruiser 224 cid 4-cylinder engine variously designated as 470, 485 and 488. It is reliable and usually the annual maintenance performed during winter layup will prevent overheating problems. Trouble shoot overheating mercruiser 3. DIAGNOSE – ENGINE IDLES TOO HIGH. Download a 200HP Yamaha, Suzuki, Evinrude, Mariner, Johnson, Mercury outboard repair manual in seconds. IAC valve? The AAC valve increases the engine idle speed until the engine warms up and then the IAC is supposed to take over, provided it's clean, working properly and the manual idle speed adjustment is set low enough to allow the IAC to control the engine idle speed (should be about 675 rpms with the engine fully warmed up, the transmission in D and fully stopped with your foot on the brake). You have the heads off so at least look at an intake valve but all caution sport - saving only $110 for marine work some is easier some aggravated by harsh use, fresh or ambient water cooled issues plus improper off season storage as applicable. Boating is significantly more pleasurable when your engine is in perfect tune - when it fires with the first turn of the key, when idling is smooth and when acceleration is razor-sharp. This INSTANT DOWNLOAD 175 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. Authorized dealer with large inventory, great prices, fast shipping!. Within about 50 miles of home topped off (half tank) with 89 octane to see if it would help. When testing for the first time in the water, It overheated, alarm went off. When attempting to diagnose an overheating MerCruiser 5. A low engine-coolant level or poor radiator hose connection can lead to an overheating vehicle with a 7. Its source must be located immediately. phrases mercruiser 4. Though the most common problem is overheating, the opposite may also happen and will create long-term problems. I'm having problems with my 1992 MerCruiser 4. We're talking about engines that start easily and accelerate smoothly, but then, after a few minutes at a steady speed, either surge in speed or misfire, causing the car to "buck. If you don't have 2 psi at idle, then change the impeller and if it still overheats then change the stats too. Marine Parts Express is the largest retailer of marine engine parts in North America. The answer to your propulsion needs. aprilia pegaso 650 1997 overheats. Trucks having overheating problem and cant figure out why, entire cooling system has been replaced, sadly im thinking headgasket :(any other suggestions? 10 Answers. 2) Loss of power. , alleging that the company's DF300 outboard overheats, causing safety concerns and shortening the life of the engine, according to court documents. Inspecting Exhaust Manifolds And Risers. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer. Alarm goes off, I lift the hatch, and it seems like its overheating before the thermostat housing. Boat Tech - Mercruiser, Sterndrives, Outboards, Engines Q&A has 1,515 members. This is a brand new Mercruiser engine which came complete with new engine mounted water pump, new risers, manifolds and new thermostat. 7 mercruiser troubleshooting 2006 mercruiser wiring diagram 2007 mercruiser. The throttle positon sensor consists of two parts: a potentiometer, and a combined idle/full throttle switch. 7L 350 MAG 7. garage in Havasu for the season with no overheating alarms. Boat engines have the same operating principles as do land vehicle engines, but having trouble with your boat engine can leave you and your family in a precarious predicament. Keep in mind that there may be more than one reason a 4. I replaced the thermostat and cleaned the plastic balls and springs in the thermostat housing. From 3200rpms on up temp keeps going up and at WOT it hits 225* before I back off. This boat has. overheating. New T stat 140, clear oil cooler, new aluminum headers. Could scale in the block and heads be the cause? Any way to treat this, besides tearing it all down? Thanks for the help. Boat Tech - Mercruiser, Sterndrives, Outboards, Engines Q&A has 1,515 members. MERCURY MERCRUISER MARINE ENGINES GM V6 262 CID (4. Hi I have a Mercruiser 5. INSTANTLY DOWNLOAD a MerCruiser engine & sterndrive repair manual straight mercruiser overheating when full throttle 05 mercruiser 350 mag mpi exhaust mercruiser service parts list 1983-1993 mercruiser 4. It will either start and idle fine, then stall or spit back through the intake when you accelerate hard, or it will take FOREVER to start and then run 95% clean at high idle to redline. 3L MerCruiser is overheating. possible causes of water in mercruiser crankcase possible reasons for 454 7. INSTANTLY DOWNLOAD a MerCruiser engine & sterndrive repair manual straight k008221 mercruiser 1997catalog motor mercruiser 5. At higher speeds, the boat tracks perfectly straight. Two men in Alaska are suing American Suzuki Motor Corp. The lawsuit was filed in June in Superior Court in the First Judicial District at Ketchikan. mercuriser 454 overheating troubleshooting mercuriser 470 overheats what is best fix mercury 496 overheat mercury 6. Mercruiser 350 Mag Service Manual Pdf mercruiser 5. The former never performed any maintenance and the engine ingested saltwater due to eroded manifold/risers and was damaged beyond repair. And pressure while driving is fine. The bypass poppet typically opens around 1800 to 2000 rpm. Explore the physics, engineering, design and general guidance of the GM Chevy 350 engine. MerCruiser 5. This INSTANT DOWNLOAD 175 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. 0 V8, 300hp, and had the mechanics start it on ground which they did before putting it in my Larson Senza 226. after taking the gas cap off and pushing the fuel rail valve. Alternator faq, frequently asked alternator questions answered, Understanding alternators. This will ensure that we will deliver you the correct marine carburetor. possible causes of water in mercruiser crankcase possible reasons for 454 7. Troubleshoot an Overheating Problem Should I remove my thermostat? Why do I overheat when going fast? Troubleshoot a No-Crank Condition Troubleshoot a No-Start Condition My Engine Backfires and/or Surges and has Lack of Power What is an Anti-Syphon Valve? My Engine blows Steam from the Exhaust Why do I hear a "clakity" sound while at idle?. The lawsuit was filed in June in Superior Court in the First Judicial District at Ketchikan. Hello Everyone, I've just inherited a 1977 Larson Shark w/ a 120/140 mercruiser alpha one i/o SN 3514130. Re: Mercruiser 7. Get Cruising With MerCruiser Complete Inboard Gas Engines. A vacuum leak on a fuel injected engine will cause high idle. They work with the existing brackets, hoses, & fittings. 3l service manual free 1990 mercruiser 4. I can immediately cool it down by revving the motor up to 1200rpm+. But mine is only when I am at idle 800 rpm it starts to rise bump it to 1000 rpm and it will drop right back down to 150 please post back if you figure out the problme I have replaced the impeller pump already in the lower unit that did nothing different. Learn about this problem, why it occurs, and how to fix it. On an Alpha drive, this pump is in the drive. Mercruiser Alpha 1 Overheating only at idle. They provide voltage to your switchbox or CDM's. 0 overheating, mercruiser 470 overheating. The last couple of times I have hooked up the "earmuffs" to the lower unit to flush the engine its almost like there's an airlock of some sort, and after a while I get the overheat alarm. Download a 35HP outboard repair manual in seconds. Your engine can overheat for a variety of reasons. 2600-3200rpms, it slowly goes to about 190*. Inboards, Bravo, TRS and all the Speedmaster drives have a separate intake pump on the engine. 3L 150,000 miles The car overheated, the water didn't seem to be flowing and was backing out of the overflow. mercruiser 6. loss of power troubleshooting: bogging down [108,913 views] We've launched an improved GY6 Technical Center for 2014! We're in the process of bringing all of these old articles to the new system. Many years ago the writer bought a Commer van with a stuck engine. 4 mpi overheating v8 magnum 7. 3 l alpha one problems with mercruiser 470 low compression. Boat Tech - Mercruiser, Sterndrives, Outboards, Engines Q&A has 1,515 members. Impellar need replaced? Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Gimbal Housing assembly has rubber components that can rot and/or rip and leak. The last time we ran her she overheated. I have forward flushed and backward the entire circuit with garden hose with the drive off. 4 mercruiser overheating 4 Cylinder, 305 CID 5. 3 overheating at idlemercruiser 4. If the air/fuel mixture is too rich for the engine while you are running at cruise speeds, the engine may tend to load up and foul the spark plugs, while if the air/fuel mixture is too lean the engine may misfire at idle and at light loads or tend to run hot or overheat. I've had a couple occasions when my starboard engine would overheat slightly while trolling after running for awhile. Trouble shoot overheating mercruiser 3. Follow the links below to your heat exchanger. If the mode button is pressed to a different screen, the flashing alarm signal will remain flashing to indicate there still is a problem. Starts and runs great on land on the hose and then once on the water starts right up but after 10 min or so of low speed or at idle starts to run rough or stalls. 0L Alpha One 4. 4-liter motor. I have an overheat problem of my own with a Mercruiser 888 (1972 twin Wellcraft Nova). Consult your Authorized MerCruiser Dealer before attempting this procedure. 350 runs great at idle but bogs down during acceleration Im running out of ideas i recently bought a gm crate engine for my 76 blazer ive replaced just about. 4 overheating; mercruiser 7. Idle speed adjustment screw location mercury 140hp 2 stroje trim problems suzuki outboard will not start advance throttle above idle 1995 mercruiser 454 overheating valve adjustment on 1983 honda outboard 275 hp where is the water pump on a 1992 yamaha 6 outboard 1974 johnson 50 hp idle adjustment yamaha power tilt / trim oil 2004 8hp merc. 5hp Mercury 1999 overheating at idle; 7. 7 lx/v8 cause for a mercruiser 7. Too restrictive of exhaust system. The Y38-4 and Y38-4A remanufactured Two Barrel MerCarb Carburetors have one idle mixture screw with the gas inlet next to the electric choke. View and Download MerCruiser 3. 4l no spark mercruiser 6. 2 mpi ecm; mercruiser 6. Hello Everyone, I've just inherited a 1977 Larson Shark w/ a 120/140 mercruiser alpha one i/o SN 3514130. 0 mercruiser mpi; alpha 1 3. Mercury's MerCruiser gas engines give you speed during launch and as you sail across the open seas, lakes, or rivers. It almost always tends to be the gauge in this scenario, as an actual loss of oil pressure for any amount of time when an engine is up to temperature would cause noticable noise almost immediately not to mention damage. 3 overheating at idlemercruiser 4. It is a 1989 4. 9hp 4 stroke outboard. 496 MerCruiser Engine Overheating 2001-2007 When a MerCruiser engine overheats, catastrophic damage to the engine will occur if the cause isn't repaired immediately. First, the pistons are made of aluminum, which has a very high thermal expansion coefficient. Trouble shoot overheating mercruiser 3. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury 115 hp outboard engines were designed primarily for factory service Mercury 115 hp outboard technicians in a properly equipped shop. 0 litre lx horsepower 1990 mercruiser alpha one 5. Step 1 - There are several combinations of misfire conditions, steady or random, at idle or under power, which may or may not be detected by the computer and trigger a check engine or service engine soon light, read trouble codes to help pinpoint the cylinder(s) in question and follow the repair guide below. Overheating can also be caused by a worn or damaged water pump impeller. The car may stall, which would strongly suggest that ignition control module may be the cause of the overheating you're experiencing. Shift outboard into neutral and check for a steady stream of water coming out of the water pump indicator hole. 0L Alpha One 4. There are many reasons why you could have an faulty ECU. When attempting to diagnose an overheating MerCruiser 5. At the end of last summer, I noticed it running a little warmer (about 160*), so I replaced the impeller. Was overheating on me, i replaced the impeller. 5 hp outboard 05 4. mercruiser 260 hp engine manual 1998 4 3 mercruiser. 1 problems with 2005 6. DOWNLOAD MerCruiser Engine Sterndrive Repair Manuals 4 3L 4. He just might save your weekend on the. 2) Loss of power. There are four holes in the Merc plate totaling a larger surface area than the L and S plate and 2. The shutters can start making a "clakity" noise. 7 Mercruiser overheating my mercruiser 5. Ever wonder why your boat is overheating? Just take a few minutes and listen Justin from SkipperBud's of Madison, WI. 2 Liter Repair Manual Search Phrases problems 2006 mercruiser 350 free service manual pdf 2006 mercruiser 350 horizon thermostat. 3L MerCruiser is overheating. DOWNLOAD MERCRUISER ENGINE & STERNDRIVE REPAIR MANUALS. Your browser does not support frames. The throttle positon sensor consists of two parts: a potentiometer, and a combined idle/full throttle switch. 0 mpi spark plugs; mercruiser factory repair manual; mercruiser overheating at idle; mercruiser. Pop Quiz: The owner of a 30' powerboat hops aboard his boat one day to go for a cruise, but his inboard V-8 engine is slow to start. Finally solved the overheating in the 5. Personal watercraft, or jet skis, require preventive maintenance on a regular basis. Does it only overheat at idle? Are you sure the fins are going the correct way and all going the same direction when the impeller was installed?. 2 mpi ecm; mercruiser 6. I have an OMC stern drive 5. 2 idle; mercruiser 6. This boat has. 0 low oil. This is the Highly Detailed factory service repair manual for theMERCURY MERCRUISER MARINE ENGINES GM V6 262 CID (4. MerCruiser 5. 3 Measured 4 Timing 5. Authorized dealer with large inventory, great prices, fast shipping!. On running the engine I measured 5 gallons in 90 seconds at idle, 5 gallons in 75 seconds at 2000rpm and 5 gallons in 50 seconds at. On running the engine I measured 5 gallons in 90 seconds at idle, 5 gallons in 75 seconds at 2000rpm and 5 gallons in 50 seconds at. 2Full throttle RPM5000 - 5750Cylinder ConfigurationI-3Displacement(CID/CC)92. MerCruiser: 60, 80, 90, 470, 485, 488, 170MR, and 190MR Book Excerpt: Mercruiser Stern Drive Repair Manual 1964-1985 (plus 1986-1987 TR, TRS) FUEL SYSTEM Fuel system problems must be isolated to the fuel pump, fuel lines, fuel filter or carburetor. Any good Fresh Water Cooling System should have excess cooling capacity. Overheating issues are classified as 'overheating engine mechanical,' 'engine overheats cooling system,' or a combination of both. If the idle vacuum is less than 12 inches Hg. Carburetor Troubleshooting Guide. Still overheats after about 20 minutes of running idle or full speed. 1 horizon manual; mercruiser 8. If no water is coming out of the water pump indicator hole or flow is intermittent, stop engine and check water intake holes for obstruction. 3 Mercruiser, runs awesome , nice and smooth, but Im having an issue with it runnning hot at idle, it runs right up to the red zone on gauge, then if i run it at a high idle or more it cools down to the halfway mark, the risers feel hot but not too hot to touch and the thermostat housing feels cool, as also the 2 hoses running into manifold. It overheats when under load, ie when planning at around 3500 rpm, below this at 1500 rpm the temp stays constant at 140-160'. In the 6 years I've owned this boat, it has always run a little above 140*. The prop spins in one direction causing the motor pull to one side, making steering tiring. Inspecting Exhaust Manifolds And Risers. The HP500 continues to provide flawless performance as the exclusive power of the APBA's exciting Factory V-Bottom Series. Unlike streetcars that need to start cold, get acceptable fuel economy, and idle in traffic without overheating, racecars don’t experience as much of a variance in operating conditions. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. Mercruiser Alpha 1 Overheating only at idle.