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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
23,215 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
Vocational, Technical or Trade School
23,215 satisfied customers
350 magnum EFI/MP Bravo One 5.7 1995 S/N OF598119.
Overheating under load, at 3000 rpm, replace sea pump new due to it was leaking by pulley, no change, also check water flow (sea) to the sea pump, check good, also run engine and disconnected hose to the exhaust manifold good water flow, ran up to 3000 in neutral good flow , then i replaced circulating pump since original from 1995! no change still over heats last I replaced thermo stat and again no change! I run in neutral as high as 3000 + no problem, only when in gear under load. Could a head gasket do this? also, the moment you reduce power in gear you can see temp drop down old boat old engine I hate giving up like to know if it is time!!! … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,215 satisfied customers
I have a 99 Mercruiser 350 (5.7l) with a Bravo III outdrive.
I have a 99 Mercruiser 350 (5.7l) with a Bravo III outdrive. I have a 140F thermostat. It usually runs around 155F. It started to go to 165 then drop to 160 then back up to 165. I replaced the raw wat… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 2001 Mercruiser 7.4L MPI on a Bravo 3, Serial #
I have a 2001 Mercruiser 7.4L MPI on a Bravo 3, Serial # ***** My temp gauge goes up and down from 160 to 170. I'm planning on changing the sender and checking the wires on the sender and gauge but th… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,215 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
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
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 have a 2007 sea ray 230 select with a 350 mag and bravo three
I have a 2007 sea ray 230 select with a 350 mag and bravo three deive. The other day we took it out and I ran it WOT with the captains call on it ran hot after about 10 minutes. We shut it down to coo… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 1989 Bayliner Capri with A Ford 5.0 Litre/302 Engine
I have a 1989 Bayliner Capri with A Ford 5.0 Litre/302 Engine and OMC Inboard/Outboard Drive. I replaced the water pump on the engine and in the drive and the engine is still overheating and the drive… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
just took 4winds out for test run, smelled something burning,
just took 4winds out for test run, smelled something burning, the elbow behind the right exhaust manifold was smoking from paint burning, no problem with the other side… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 2001 4.3L. It will start to over heat the faster
I have a 2001 4.3L. It will start to over heat the faster I go, but sometimes it will start to cool down going fast. I've replaced the impeller and the thermostat but it keeps running hot. I can't fig… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 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
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
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
Mercury & Mercruiser Diagnostics
Master's Degree
99 satisfied customers
About a year ago, I changed my raw water pump on my Caravelle
About a year ago, I changed my raw water pump on my Caravelle (305 Volvo Penta) no problems with the change. 2 pieces were missing and the boat only had 80 hours on it. Now the boat starts getting hot… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
My friend is buying a used 2001 searay with 28 hours on it
My friend is buying a used 2001 searay with 28 hours on it from a used boat dealer. The starboard riser is hot to the touch after about 3 to 5 seconds of leaving your hand on it. The port riser is coo… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
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
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
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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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