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Mercruiser 4.3 overheating on my boat I already changed
Mercruiser 4.3 overheating on my boat I already changed impeller on the outdrive, the thermostat and the risers have been changed still overeating...… read more
Boat Doc
Boat Doc
253 satisfied customers
i have twin Mercruiser 305 ci (MIE228) in a 1978 Bertram 28
i have twin Mercruiser 305 ci (MIE228) in a 1978 Bertram 28 the port engine has been overheating with the temp gauge showing rapid increase at higher rpm, then dropping when rpms are reduced and engin… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Mercruiser 4.3LX V6 with Alpha Gen 2 drives. Thunderbolt Ignition.
Mercruiser 4.3LX V6 with Alpha Gen 2 drives. Thunderbolt Ignition. Standard carburetor. Problem: Starboard Engine High Speed Overheating At idle and speeds up to 2000 rpm, temp is ok. After getting up… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 06 mercruiser/alpha with a closed cooled system went
I have a 06 mercruiser/alpha with a closed cooled system went to run it after 2 weeks and it overheated no water to the heat exchanger the pump on the sterndrive is working the impeller on the engine … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Yesterday our boat searay 260 would idle fine getting on
yesterday our boat searay 260 would idle fine getting on plane it got and the alarm would go off we got a new impeller on and a new thermostat and today it did the same thing it still idles fine but i… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
1,031 satisfied customers
I have restored a 1974 Chris Craft XK-19 boat. Fresh water
I have restored a 1974 Chris Craft XK-19 boat. Fresh water use only - no salt water use. It now has a 2007 Chevy 350 replacement crate motor. It uses the log style, wet marine manifolds with "hump ris… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
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1988 big block 454, 34 searay, idle it runs fine 140-145,
1988 big block 454, 34 searay, idle it runs fine 140-145, good water flow out both exhausts,any power the temp max spike right away 202+ I have to shut it down right away. New impeller, new thermostat… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I HAVE A 85 MERCRUISER 5.7 WITH AN ALPHA ONE OUTDRIVE. IT
I HAVE A 85 MERCRUISER 5.7 WITH AN ALPHA ONE OUTDRIVE. IT HAS A NEW WATER PUMP IN THE OUT DRIVE, I PUT A NEW THERMOSTAT IN, AND HAVE MADE SURE THE MANIFOLDS AND RISERS ARE CLEAR BY PUSHING WATER THROG… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a mercruiser 5.7L engine. aside from the choke unit,
I have a mercruiser 5.7L engine. aside from the choke unit, is the intake manifold the same as an automotive? I searching for a running hot situation, with all raw water components being new. (manifol… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Dominick, I am having a similar issue with my 1998 7.4Gi volvo
Dominick, I am having a similar issue with my 1998 7.4Gi volvo penta engine.. At idle the temp is below 175 degrees, at 3000 RPM's it climbs over 175 to almost 180. At WOT,it will overheat. So far I h… read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 satisfied customers
I have just had a new SX-A outdrive installed on my boat, which
I have just had a new SX-A outdrive installed on my boat, which already had a Volvo 5.7L engine. Is it sufficient to winterize it by attaching a winterizing kit to the lower unit and running 3-4 gallo… read more
John White
John White
Marine Mechanic
Vocational, Technical or Trade Scho
306 satisfied customers
I have an 1989 17 vip boat. It has a 2.3l engine with an omc
I have an 1989 17' vip boat. It has a 2.3l engine with an omc outdrive. I know there is a conversion to make it a mercrcruiser outdrive. What I need to know is which particular outdrive and conversion… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have an older (1976) mercruiser 233 (351) which I purchased
I have an older (1976) mercruiser 233 (351) which I purchased with a serious overheating problem. I have replaced the outdrive impeller with a kit and checked most of the cooling system for blockages … read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have an over heating problem in the starboard bravo 2 mercruiser;
I have an over heating problem in the starboard bravo 2 mercruiser; oil pressure is good and there appears to be adequate coolant. Is the water intake clogged and if so where do you repair it from… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I bought a boat that I have been working on all summer. It
I bought a boat that I have been working on all summer. It didn't have exhaust manifolds or plumbing for the cooling system, after alot of research I finally got it all together. I replaced everything… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
i have a 1988 4.3 liter mercruiser. changed water pump in outdrive.
i have a 1988 4.3 liter mercruiser. changed water pump in outdrive. new bellows exhaust, gimble new water hose. checked risers,manifolds,engine circulating pump.new thermostat. temp. flucuates between… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a 5.0l Mercruiser. A few minutes after starting the
I have a 5.0l Mercruiser. A few minutes after starting the engine, the water from the thermostat housing to the engine water circulating pump, and the starboard manifold becomes very hot, the water to… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
28 ft searay...2 350 smblks.....one starts overheating
28 ft searay...2 350 smblks.....one starts overheating slowly after 20....30 min running at 3500 rpms......where should i start to ck ? Thanks Bob… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

Dominick

Dominick

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1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

John White

John White

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11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

Captain Dave

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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