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Thermostat housing SEEMS to be the only hot spot at 180
thermostat housing SEEMS to be the only hot spot at 180 degrees (which sets alarm off). Pulled and cleaned the housing new 160 t-stat cleared water hoses , temps at 2000 rpms on risers 80 port 95 star… read more
Ted G.
Ted G.
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Vocational, Technical or Trade Scho
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I have a 2008 5.7Gi300J with 250 hours. Just recently the
I have a 2008 5.7Gi300J with 250 hours. Just recently the engine over heats slowly (10 minutes at idle) when in sea water. If I attach hose water it will idle indefinitely without overheat. Thermostat… read more
Jason
Jason
Marine Mechanic
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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
Tan
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I have a volvo penta 1994 7.4 GL Over heating problem, fresh
I have a volvo penta 1994 7.4 GL Over heating problem, fresh water cooled. I installed new water pump, new T stat, cleaned heat exchanger. (new maniflods & risers 4 years ago) while at idle water only… read more
Jason
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2000 volvo 7.4 gi engine overheats new pump checked engine
2000 volvo 7.4 gi engine overheats new pump checked engine circulation pump replaced thermosat an back flushed hose, I suspect exh manifolds?… read more
orcamarine
orcamarine
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Vocational, Technical or Trade Scho
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i have a 1976 mercruiser 250 (350) gm engine. Boat has sat
i have a 1976 mercruiser 250 (350) gm engine. Boat has sat for eight years . I rebuilt engine complete (30 year heavy equip mechanic) My yard installed the engine and outdrive New water pupm twice in … read more
Tan
Tan
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Certified Marine Technician
11,409 satisfied customers
I have a question on the cooling system. I replaced the T
I have a question on the cooling system. I replaced the T stat on the engine. I shoved the water hose in the hole to the large rubber hose and it filled up but did not drain off. I then shoved the hos… read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
Have 1996 Hydrodyne with pcm engine. Wet exhaust manifold
Have 1996 Hydrodyne with pcm engine. Wet exhaust manifold keeps overheating in less than 1 minute run time. Replace transfer water pump impeller. No improvement. Does water pump need to be primed? Che… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a Mercruiser MCM 7.4 litre Bravo that I replaced the
I have a Mercruiser MCM 7.4 litre Bravo that I replaced the heads and manifolds on last fall. Now the engine runs perfectly, however begins overheating at 2000 RPM and higher. I have replaced the seaw… read more
Jason
Jason
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I have checked the T-stat housing, not clogged, and for 5 years
I have checked the T-stat housing, not clogged, and for 5 years I have not overheated, mis-plumbed seems doubtful, being that the input into the T-stat house is much larger hose than the feed from the… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
1,031 satisfied customers
Volvo cooling problem. 4.3 v6. Was overheating, changed impeller.
Volvo cooling problem. 4.3 v6. Was overheating, changed impeller. Now has problem taking a prime, at put in will overheat unless I rec engine over 3000 rpm. After that it will cool down and stay cool … read more
Jason
Jason
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25,136 satisfied customers
I have a 1982 regal 277 with twin 260 mercruiser i/os in it.
I have a 1982 regal 277 with twin 260 mercruiser i/o's in it. My problem is that I have a high speed overheat problem that I have been chasing for 3 years now. When I run over 3500 rpm my port motor w… read more
Jason
Jason
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5.7L 350, OF601827,stern drive Alpha/gen. The impeller,both
5.7L 350, OF601827,stern drive Alpha/gen. The impeller,both manifolds & risers,thermostat,water pump have been replaced(new) this month. The engine still heats til the alarm goes off as the temp rises… read more
Tan
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I have a 1979 mercruiser with 350 chev engine having over heating
I have a 1979 mercruiser with 350 chev engine having over heating problems. How much water should come out of the house right after the stern drive hooked up to garden hose? Trying to trouble shoot pr… read more
K. Kergan
K. Kergan
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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
348 satisfied customers
iam leaking gear oil out of a small hole on the upper unit
iam leaking gear oil out of a small hole on the upper unit on the outdrive .and there is smoke coming out of the intake and exaust manifolds what can i do to solve this problem ?… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
403 satisfied customers
88 Mercruiser 5.7, w Alpha 1. Gets too warm, 200 degrees indicated.
88 Mercruiser 5.7, w Alpha 1. Gets too warm, 200 degrees indicated. Found perforated outdrive to transom hose, fixed it. Still over 180 degrees. Found ruined impeller and melted water tube, rebuilt st… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
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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
master marine mechanic
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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

25,136 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

3,046 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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