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My boat is a 1998 SeaRay 210SD with 5.0 L EFI. With a recent
My boat is a 1998 SeaRay 210SD with 5.0 L EFI. With a recent spark plug change and ESC change in the distributer it runs strong, After about 2-3 minutes at WOT , the temperature first drops then shoot… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
1990 Mercruiser 5.7 Litre, operating in salt water. Port
1990 Mercruiser 5.7 Litre, operating in salt water. Port exhaust elbow much hotter than starboard. I have thermostat housing with 6 tubes (raw water in; to water pump; 2 to exhaust manifolds; and 2 to… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,634 satisfied customers
318 Chrysler Marine engine, raw water cooled. Replaced thermostat
318 Chrysler Marine engine, raw water cooled. Replaced thermostat & sensor on leeward engine as it is running very cold. The temp gauge was tested and works fine. The manifold is cold. Engine continue… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Tan here is a follow up based on your suggestions... The
Tan here is a follow up based on your suggestions... The pressure test of the cooling system did not reveal any real issue. There was a slight drop in pressure of the port engine but very very close t… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 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, i need to know how the sea pick up water flow thru the
Hi, i need to know how the sea pick up water flow thru the engine as only one elbow is cooled but the right one is hot.Also the stop valve inside the exhaust pipe is burn. The engine is a 5.L mercruis… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
4,094 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
2,634 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
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar ), installed new 160 degree thermostat. Engines starts fine, temp goes to 180 and stays there. Can cruise for hours below approx. 2500 r… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
HI my name is Joe i have a 1998 5.7 mercruiser alfa 1 generation
HI my name is XXXXX XXXXX have a 1998 5.7 mercruiser alfa 1 generation 2 with a heating problem. The starboard side of the motor gets extremely hot. The water temperature rises to 180 degress or highe… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
I give up. I have a 2002 Mercruiser 5.0L MPI with bravoIII.
I give up. I have a 2002 Mercruiser 5.0L MPI with bravoIII. Keeps overheating. I replaced EVERYTHING!! Thermostat , Water Circulating pump twice, Sea water impeller, Exhaust Mans & Elbows. Hoses are u… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
converted my v8 mercruiser log stye manifold system to the
converted my v8 mercruiser log stye manifold system to the Center rise model...The problem is that one side of the exhaust runs warm and the other side runs hot ? The temp guage on dash is normal...Wh… read more
Kenny
Kenny
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Master's Degree
99 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
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
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 satisfied customers
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
Associate Degree
402 satisfied customers
Have 1997 5.7L Raw water cooled 210 hours original engine on
Have 1997 5.7L Raw water cooled 210 hours original engine on SeaRay Sundancer 240. Last year replaced both exhaust elbows and risers. Since then Starboard exhaust side runs warm to hot. Port side is c… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, 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

22,043 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

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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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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