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Mercruiser 3.0 water in oiL Got boat going after a year or
Mercruiser 3.0 water in oiLGot boat going after a year or so. Milky oil comes out of vent on top of valve cover.… read more
Noel Schembri
Noel Schembri
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Diploma
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Is there any other way fresh water can enterthe cylinders on
is there any other way fresh water can enterthe cylinders on a 5.7 liter mercruiser besides the heat exchanger or a bown head gasket ?… read more
Tan
Tan
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Certified Marine Technician
11,409 satisfied customers
Mercruiser Mag 350 overheating. Have replaced raw water
Mercruiser Mag 350 overheating. Have replaced raw water pump. Thermastat looks "charred" with build up that looks like carbon on a spark plug. Ran w/thermastat completely removed. Still overheating. A… read more
Jason
Jason
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Vocational, Technical or Trade School
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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 mercruiser 260 350 chev engine .The starboard side
I have a mercruiser 260 350 chev engine .The starboard side of the engine is getting hot.Question is where does the thermostat go in the housing top or bottom seems to look like it could go either way… read more
Jason
Jason
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Vocational, Technical or Trade School
24,602 satisfied customers
i have water in my oil how can i check if is the riser,exhaust,intake
i have water in my oil how can i check if is the riser,exhaust,intake maniford,head gasket,heads or crack engine and the best way to fix it with out costing me a arm and a leg. the engine is a mercrui… read more
Tan
Tan
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Certified Marine Technician
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I need original parts numbers for marine exhaust manifolds,
I need original parts numbers for marine exhaust manifolds, 1.5 inch spacer and risers for a 1974 454cid 350hp bluewater mercruiser engine… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
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Hi my Mercruiser 1999 5.7 liter engine hydro-locked. Water
Hi my Mercruiser 1999 5.7 liter engine hydro-locked. Water came out of middle two #4 and 6 cylinders on port side.I had an overheating issue earlier and worked better after flushing with fresh water. … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
i am new to boating. have a 1995 chaparral with mercruiser
i am new to boating. have a 1995 chaparral with mercruiser 5.7L engine. have had for 3 years. cranked up to take out this weekend for first time this summer. locked up. took spark plugs out. water in … read more
Tan
Tan
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I have a 1988 Carver Montigue 25 Ft. with a 350 Chevy small
I have a 1988 Carver Montigue 25 Ft. with a 350 Chevy small block, 5.7 Mercruiser, Alpha 1 drive, fresh water cooled. I have discovered anti-freeze is low for unknown reasons. I have no apparent anti-… read more
James
James
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Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a Sea Ray Sundancer 270 with twin 5.7 mercruiser. The
I have a Sea Ray Sundancer 270 with twin 5.7 mercruiser. The starboard engine has water in all 8 cylinders. Any ideas where this would come from. If a head or gasket issue, I'd expect maybe 2 cylinder… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 76 Mercruiser with a 250 Chevy engine. I have water
I have a '76 Mercruiser with a 250 Chevy engine. I have water entering the #6 cylinder. There is no sign of water in the crankcase. Is there a freeze plug in the manifold or do I have a hole or crack … read more
Whitecap36
Whitecap36
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Vocational, Technical or Trade Scho
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I have a 2000 mercruiser 5.0 EFI stern drive. Have a problem
I have a 2000 mercruiser 5.0 EFI stern drive. Have a problem with water getting in to the engine. Pulled all of the spark plugs and turned it over. I saw water pump out form port side cylinders (I bel… read more
Michael
Michael
master marine technician/charter captain
Vocational, Technical or Trade Scho
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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
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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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Mercruiser 350 260 hp, raw water cooled in salt water. Large
Mercruiser 350 260 hp, raw water cooled in salt water. Large amount of water in oil causeing foaming and overfull crankcase. Pulled heads, found lots of water in middle cyls port side and appears to b… read more
Jeremy R.
Jeremy R.
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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
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I have a 2000 mercruiser 5.7, 350. I am changing the oil ...
I have a 2000 mercruiser 5.7, 350. I am changing the oil but unlike my other boats I cannot locate the oil filter. Where is it?… read more
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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

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Dominick

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John White

John White

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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

Jeff G.

Jeff G.

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Noel Schembri

Noel Schembri

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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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