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I changed the exhaust manifold and elbow on both port and
Hi. I changed the exhaust manifold and elbow on both port and starbord sides (1995 5.7L mercruiser sea water cooled). The starboard side eloe gasket is leaking from the corner. I an the boat for an ho… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,618 satisfied customers
I have a 2000 sea ray 340 with mercruisers 454 horizon
i have a 2000 sea ray 340 with mercruisers 454 horizon engines. I am replacing the manifold and gaskets and want to make sure i use the right gaskets. I have 3 inch spacers and the gaskets that were o… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
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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
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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
11,406 satisfied customers
We have a 2670 Bayliner Explorer with a 125AQ Volvo Penta
We have a 2670 Bayliner Explorer with a 125AQ Volvo Penta coupled to a 270 outdrive. Built in 1981. Boat long distances in Prince William Sound. Last tune up was about 200 hours ago. I did not properl… read more
Jason
Jason
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Vocational, Technical or Trade School
19,618 satisfied customers
I have a Mercruiser 5.0 efi engine from 1998 With a Alpha
Hello I have a Mercruiser 5.0 efi engine from 1998 With a Alpha One gen 1 drive and also a Alpha thermostat house. The temparature of my exhaust elbows at 3500rpm are 35 degrees and 55 degrees is that… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,836 satisfied customers
I am looking for a Vortex V6 with exhaust manifold and transmission
I am looking for a Vortex V6 with exhaust manifold and transmission for my restored 1940 19'6" Gar Wood wooden boat. Do you have a source or recommendation?… read more
Michael
Michael
master marine technician/charter captain
Vocational, Technical or Trade Scho
256 satisfied customers
I am looking at a 1989 Carver with twin Mercruisers 3.7 liter
I am looking at a 1989 Carver with twin Mercruisers 3.7 liter engines. The cooling system is a closed one and the motors have 150 hrs on them each. Should I have any concerns about these motors? Plus … 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
i have a westerbeke 7.2 gas generator, just changes heat exchanger
i have a westerbeke 7.2 gas generator, just changes heat exchanger but it still runs hot after about 2 mins, any suggestions… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
Marine Power GM 350hp 5.7L inboard engine producing excessive
Marine Power GM 350hp 5.7L inboard engine producing excessive steam vapor wet exhaust when compared to other adjacent engine.… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
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i have a 2006 280 searay with a 496 merc and bravo 3 stern
i have a 2006 280 searay with a 496 merc and bravoXXXXXi have a problems with over heating, and have put on new impeller and new water pump housing,and still have a problem with over heating ,and also… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
1984 omc 3.8 liter fresh water cooled. Having overheating issues.
1984 omc 3.8 liter fresh water cooled. Having overheating issues. replaced lower unit pump (looked ok) and circulation pump (impeller a mess). Originally was able to run boat on a plane to keep engine… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 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
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Vocational, Technical or Trade Scho
1,167 satisfied customers
i have a 5.7 l mercruiser inboard that is overheating at trolling
i have a 5.7 l mercruiser inboard that is overheating at trolling speed only. changed the impeller and it's still happening. runs cool at higher rpms in fact if it starts to climb when trolling 2.5 mp… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a pair of Yanmar 240 HP with 780 hrs on them. The exhaust
I have a pair of Yanmar 240 HP with 780 hrs on them. The exhaust elbows on port engine just rusted through and came apart and filled the engine room with thick black smoke on my MAINSHIP 40. I can see… read more
Professor Diesel
Professor Diesel
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Vocational, Technical or Trade Scho
14 satisfied customers
86 3.7 mercruiser with closed cooling system. Overheated and
86 3.7 mercruiser with closed cooling system. Overheated and when I fill the cooling system water leaks out the back of boat… read more
Michael
Michael
master marine technician/charter captain
Vocational, Technical or Trade Scho
256 satisfied customers
I have a 2001 4.3L V6 Mercruiser with an Alpha outdrive. The
I have a 2001 4.3L V6 Mercruiser with an Alpha outdrive. The stock one piece exhaust elbows rusted out and water got into the engine so I pulled the motor out and rebuilt it. The heads were taken in a… 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

1,488 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

19,618 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,406 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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