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My Crusader 454 gas engine is overheating after 20 minutes
my Crusader 454 gas engine is overheating after 20 minutes of running at 3000 rpm, when i back it down it cools within 2 minutes. ive checked sea strainer, heat exchanger and everything is fine there.… read more
NicholasH311
NicholasH311
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Overheating, I've cleaned the risers with were pretty bad.
I've cleaned the risers with were pretty bad. do i need to go further ?? … read more
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1989 34 searay express 34 both engines run at 165 degrees
1989 34 searay express 34 both engines run at 165 degrees but gauges show 40 degree difference … read more
Tan
Tan
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My 454 marine engine on the port side overheats at gher rpm.
My 454 marine engine on the port side overheats at higher rpm. We installed a new impeller and back flushed the heat exchanger. We also took off the riser and cleaned it with acid and replace the exha… read more
Jason
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454 fresh water cooled crusaders. Question: will water in
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I have a crusader 350cdi 270 engine in my ChrisCraft 1982.
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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
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I have a 7.4 L , closed cooling, inboard. The motor was running
I have a 7.4 L , closed cooling, inboard. The motor was running around 160 to 180. Replaced the raw water pump but it did nothing. Old one was in good shape. Pulled out the thermostat, that got me hom… read more
Jason
Jason
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I have twin Volvo Penta 8.1 Gil-F engines in a V-drive configuration.
I have twin Volvo Penta 8.1 Gil-F engines in a V-drive configuration. My port engine runs hot when in idle. If I am running at speed or if I have at least 1500 RPM it cools fine. I have changed the im… read more
Jason
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i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold sensors throw an alarm at about 175 degrees. The engine temp with a temp gun is 165, the manifold are the same and the risers get up to 20… read more
James
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I have a Rinker 232 with a mecruiser 5.0l alpha one engine
I have a Rinker 232 with a mecruiser 5.0l alpha one engine with steam coming from the exhaust. Cleaned both risers and replaced the thermostat but still have the same problem. Starboard riser is also … read more
Noel Schembri
Noel Schembri
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hi there, 1997 38 carver sant. runs hot like 210 degrees and
hi there, 1997 38 carver sant. runs hot like 210 degrees and every part has been changed.454s 650 hours and i am afraid to go far because it will overheat.… read more
Jeremy R.
Jeremy R.
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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
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I have 1986 454 Crusaders, the right engine steams a small
I have 1986 454 Crusaders, the right engine steams a small bit at idle. I have installed new raw water pump,new exhaust manifolds, new 4" risers, new exhaust elbows,new oil cooler and had the heat exc… read more
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Vocational, Technical or Trade Scho
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I have a 1988 Mastercraft with 351 that will rise in temperature
I have a 1988 Mastercraft with 351 that will rise in temperature to 190-200 in about 10 minutes of operation. If I slow down and idle, it cools back to 160 and stay there. I have replaced raw water pu… read more
Tan
Tan
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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
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Vocational, Technical or Trade Scho
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After a couple of hour run at least 3/4 throttle, my 1999 Mercruiser
After a couple of hour run at least 3/4 throttle, my 1999 Mercruiser 4.3 risers doesn't seem to be heating equally. The starboard riser seems it's normal hot to touch, while the port riser is barely w… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
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I have a 1988 searay with 2 454 340 hp fresh water cooled engines.
I have a 1988 searay with 2 454 340 hp fresh water cooled engines. when I bought it back in 1998 the starboard engine ran 10 degrees hotter then the port engine I replaced the raw water impeller clean… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Marine Mechanic

4,145 satisfied customers

40 years experience, Safe boating instruct., Failure Analysis, Expert Witness

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

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

Jason

Jason

Marine Mechanic

24,193 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,730 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Noel Schembri

Noel Schembri

Marine Mechanic

3,381 satisfied customers

Advanced technical diploma

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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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