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Overheating on 1997 Mercruiser 7.4L. THe exhaust tube on the
THe exhaust tube on the right side of the engine is getting hot. Left side runs at 103 degrees F, right side is 170 … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,850 satisfied customers
I have water coming out of spark plug holes, I've already
I have water coming out of spark plug holes, I've already identified issue with exhaust risers, which got water into manifolds. How do I stop water from coming out of cylinders without damaging engine… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,627 satisfied customers
Finding drive oil on the outside of the bravo one drive.
finding drive oil on the outside of the bravo one drive. Near the top but I cant find exactly where it comes from … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,850 satisfied customers
Engine gauge reads between 170-175 degrees. Left side of
Engine gauge reads between 170-175 degrees. Left side of engine is getting significantly hotter than the right...I will burn my hand almost instantly if I touch the exhaust manifold. Water circulation… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,850 satisfied customers
Have a 1981 260 Mercruiser with an overheating issue, has a
Have a 1981 260 Mercruiser with an overheating issue, has a new water pump, exhaust manifolds, new risers, new thermostat housing and and thermostat. Still overheats.Engine runs excellent!… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,850 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
Hi! 2001 Merc 350 Mag with thru hull exhaust: on cold start,
Hi! 2001 Merc 350 Mag with thru hull exhaust: on cold start, water exits both exhausts, soon thereafter only port side. Starboard side riser very hot to touch. Is this normal? or is there a stuck ther… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade School
22,850 satisfied customers
The port manifold is hot, can touch it for second, the Thermostat
The port manifold is hot, can touch it for second, the Thermostat gage is reading 160, let is run for 15 minutes, it take about 5 minutes for the water to come out of the port manifold and is about 40… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Hi there, New problem. Im running hot. in slip get up 145
Hi there, New problem. I'm running hot. in slip get up 145 fast. Driving goes to 170 and keeps creeping up to 180-190 so I shut it down. Then creeps up to 200 with engine off. Turn it on temp goes dow… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
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
Marine mechanic
Diploma
2,627 satisfied customers
5.7L raw water cooled. Starboard side riser running too hot
5.7L raw water cooled. Starboard side riser running too hot to touch. Changed the riser with a new one, no difference. Still running hot on the one side.… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer I noticed it was running hotter than what I remembered....~190-200. I checked the impeller and it looked OK. I replaced the thermostat … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,850 satisfied customers
I have a 1989 mastercraft tristar boat. The boat is running
I have a 1989 mastercraft tristar boat. The boat is running hot, 200-220 F. I take the thermostat out and it runs cool 130 F. I put in two different 143 F thermostats and no change. I did a water flow… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 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
402 satisfied customers
I have a alpa one generationXXXXXand it is leaking
I have a alpa one generationXXXXXand it is leaking gear oil out of two small holes on the side of the unit and when i run the engine i have smoke coming out of the risers what could be the problem ? c… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
402 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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25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

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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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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