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How to bench test Merc riser ell 865331A02 for leaks. Engine
how to bench test Merc riser ell 865331A02 for leaks … read more
Jason
Jason
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Vocational, Technical or Trade School
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Overheating brand new rebuild 454 7.4, new rw pump new
new rw pump new pickup hose through transom rebuilt long block new thermostat housing new intake manifold new exhaust risers everything is brand new 140 thermostat we idle at temp increase rpm start to over heat new circulating pump new oil cooler all checked for restricting and all clear increase rpm heat goes up when mechanic to boat out first sterile temp climbed to 225 degrees … read more
Jason
Jason
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Tan, I have twin 1987 mercruiser 260s that the inboard manifold
Tan, I have twin 1987 mercruiser 260s that the inboard manifold on the starboard engine is overheating. I replaced the manifold with a new GLM manifold and exhaust elbow 3". It still overheated. I rep… read more
Tan
Tan
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what causes a 7.4 to run 200 degrees when its twin runs 175
what causes a 7.4 to run 200 degrees when its twin runs 175 degrees. I have changed everthing then I crossed wired everthing to the port motor.It still runs 200 deg. Ive used a laser temp. gun and com… read more
Jason
Jason
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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.
5,362 satisfied customers
I just recieved two rebuilt engines, one works great and the
I just recieved two rebuilt engines, one works great and the other over heats. The oil in the port engine has less than one hour useage. New oil and filter put in a few weeks ago. I was told that the … read more
Captain Dave
Captain Dave
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Master's Degree
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OK...Put your cap on...Been at this for 3 decades, but this
OK...Put your cap on...Been at this for 3 decades, but this one is killing me. 7.4 MPI ser# XXXXX that the temp will not stabilize. At idle with plenty of water, or in the lake, after it warms the tem… read more
Jeremy R.
Jeremy R.
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I asked this question before but did not get an answer that
I asked this question before but did not get an answer that could solve the problem...Okay here it goes again. I have a 1981 mercruiser 260 hp .. I have just changed over my exhaust manifold system fr… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
Twin inboard 454 crusader 7.4 XLs starboard engine seems to
Twin inboard 454 crusader 7.4 XL's starboard engine seems to put out more steam than the port engine. Nothing obviously overheating. Temps at the gauges 175. Any thoughts… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
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I purchased a 1995 Wellcraft 3200 Martinique with twin Mercruiser
I purchased a 1995 Wellcraft 3200 Martinique with twin Mercruiser 7.4 L MPI in April... I thought they were 310 HP, but after going back and looking at the old add, they are 330 HP engines... My quest… read more
capt ron 1959
capt ron 1959
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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
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
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Presently the starboard exhaust elbow on my 1999 7.4 MPI is
Presently the starboard exhaust elbow on my 1999 7.4 MPI is running hotter than the port side; 145deg. starboard, 88 deg. port. It would seem that there might be a restriction causing this, but I'm wo… read more
Joe
Joe
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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.
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1984 235 HP 5.0 over heats, stbd side flows better than port,
1984 235 HP 5.0 over heats, stbd side flows better than port, risers and manifold are clear what gives?… read more
briggs archer
briggs archer
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have twin 454 7.4 340hp mercruisers in my wellcraft,, installed
have twin 454 7.4 340hp mercruisers in my wellcraft,, installed fresh water cooling on both engines as directions,, both engines lose water in fresh water tank when running but they stay full when not… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
I have a 5.7 fuel injected I believe about 270 HP factory installed
I have a 5.7 fuel injected I believe about 270 HP factory installed original in a 2000 WA250 Sportcraft engine is running about 190-200 degrees usually stays about 170 this has been a gradual increase… read more
Mechman45
Mechman45
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I have two inboard motors when they are in idle, the one motor
I have two inboard motors when they are in idle, the one motor is running at 145, the other is running at 175, I changed out the thermostates, what else could the problem be?… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
Ihave a 3870 Cruisers with 2 454 Magnum 380 Horizon ...
Ihave a 3870 Cruisers with 2 454 Magnum 380 Horizon engines. At survey we had a considerable amount of white smoke coming from the port engine. The owner and surveyor said that it was condensation wit… read more
Captain Dave
Captain Dave
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Master's Degree
2,808 satisfied customers
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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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