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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
25,136 satisfied customers
I HAVE 89 MERCRUISER WITH BIG BLOCK, 3 YEARS AGO I CONVERTED
HELLO , I HAVE 89 MERCRUISER WITH BIG BLOCK, 3 YEARS AGO I CONVERTED IT TO ***** MANIFOLDS COOLANT RISERS FRESH WATER COOLED HAS BEEN COOLING PERFECTLY THE MANIFOLDS I HAD USED AT THE TIME WERE USED A… read more
CalebA820
CalebA820
Technician
Marine technology
22 satisfied customers
Port engine is heating up to 192, replaced manifolds,
Port engine is heating up to 192, replaced manifolds, thermostat and impeller, pumps plenty of water and risers are not hot to touch, thinking maybe a temp sensor? … read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
I have twin Volvo Punta 5.0 Gi engines both have good
Hey Jason, I have twin Volvo Punta 5.0 Gi engines both have good impellers and clear water passages, new thermostats. In the water at idle for only around 10 minutes I'm getting 130ish degrees on the … read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
I have a 2014 Mercruiser 5.7 fresh water cooled. It
I have a 2014 Mercruiser 5.7 fresh water cooled. It overheated yesterday. I put a gallon of coolant in tonight and ran it. It stayed at 160-170 at dock idling for 15 minutes. I took it for a ride and … read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
2004 Mercruiser 5.0 MPI V8 Bravo 3 is overheating. History:
2004 Mercruiser 5.0 MPI V8 Bravo 3 is overheating. History: It was a salt water boat that was drystacked in SC. Boat is a 2004 Sea Ray Sundeck 260. Engine serial number 668946 it has dry joints and a … read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
Engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662.
engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662. use boat in saltwater, engine is open cooled system using seawater for cooling. Temp are running between 185 and 205 on gauge on boa… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Have 1993 volvo penta 570a small block gm 350 starboard engine
have 1993 volvo penta 570a small block gm 350 starboard engine is over heating.had hydro lock two years ago,had rebuilt heads and gaskets done but reused exhaust manifolds.cooling system checked and i… read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
I have a 2000 Mercruiser 7.4L MPI engine on a Bravo 3,
I have a 2000 Mercruiser 7.4L MPI engine on a Bravo 3, serial # ***** I hit the risers with a IR temp gun during the first cruise. At 1000 RPMs, both are 85 degrees. at 3600 RPMs, the port riser is 90… read more
Ted G.
Ted G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,145 satisfied customers
I am looking at a 1986 30 weekender with twin 5.7 mercruisers
I am looking at a 1986 30 weekender with twin 5.7 mercruisers with 1100 hrs. The starboard engine seems to have a white smoke or steam exiting the exhaust and dissipating quickly when a few feet after… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 1978 Egg Harbor sport fish with twin 270 HP Crusader
I have a 1978 Egg Harbor sport fish with twin 270 HP Crusader gas engines (350 GM blocks) - raw-cooled. The starboard engine has never been touched and has around 2200 hours. Over the past couple of s… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
lost my water pump impeller on 98 330 sea ray with v drives
lost my water pump impeller on 98 330 sea ray with v drives last year local shop replaced impeller. they did not flush system so they came back and removed a few pieces of rubber because of a lack of … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Tan My starboard engine runs about 20 degrees hotter than
Tan My starboard engine runs about 20 degrees hotter than port. At item the discrepancy is not noticeable but as Rpms increase it plays itself out… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
1997 mercruiser 7.4 low hours, fresh water use only, manifolds
1997 mercruiser 7.4 low hours, fresh water use only, manifolds too hot to touch! I replaced impeller,checked water flow with earmuffs,enginr temp is ok at 160 degrees. I pulled off starboard riser it … read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
I have volvo d6 310 inboard engines. They top out at 3600 rpms.
I have volvo d6 310 inboard engines. They top out at 3600 rpms. If I run the port engine full out the temps goes to 200f and holds, while the gauge on the starboard engine stays at 185f. There are new… read more
Jason
Jason
Marine Mechanic
25,136 satisfied customers
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold sensors throw an alarm at about 175 degrees. The engine temp with a temp gun is 165, the manifold are the same and the risers get up to 20… 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
I have 1986 454 Crusaders, the right engine steams a small
I have 1986 454 Crusaders, the right engine steams a small bit at idle. I have installed new raw water pump,new exhaust manifolds, new 4" risers, new exhaust elbows,new oil cooler and had the heat exc… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
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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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