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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
Vocational, Technical or Trade School
22,043 satisfied customers
Jason, I have 1987 Bayliner with 454 engines. It runs well
Jason, I have 1987 Bayliner with 454 engines. It runs well at normal speeds and engine temperature seem fine on both engines. However, when you go at full throttle at 2800 rpm there is a white/gray sm… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I replaced an impeller for the first time. I did it like the
I replaced an impeller for the first time. I did it like the u tube vidieo and lubricated it with dish soap too. After that I took the boat out and it slowly heated up to 160 before I got to the lake.… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 1989 bayliner 2455 ciera sunbridge with the 5.8 motor,
I have a 1989 bayliner 2455 ciera sunbridge with the 5.8 motor, just put new exhaust manifolds on and first time out motor got hot about 220 deg motor then had a slight knock ,oil pressure dropped. sh… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 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
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 am having water Temprature issues my 4LH-STE has 800 hours
I am having water Temprature issues my 4LH-STE has 800 hours and has never had a single problem. About 4 months ago just after leaving the marina snd acellerating the boat up to speed my Temp. alarm w… read more
boatmechanicma
boatmechanicma
3 satisfied customers
I have a 2000 mercruiser 4.3L in a bayliner boat. Every once
I have a 2000 mercruiser 4.3L in a bayliner boat. Every once and awhile the check water temp light/alarm comes on. It seems to do it when its really hot out and in high water temps...90 degree water..… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
I have a 25 ft Davis Bahia with a 5.7 GI-EF model engine in
I have a 25 ft Davis Bahia with a 5.7 GI-EF model engine in it with a fresh water colsed loop cooling system. A couple of weeks ago the raw water impeller disintegrated on me just off the boat ramp. W… 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
I have a Volvo Penta 7.4 Gxi in my 1988 Bayliner. The lower
I have a Volvo Penta 7.4 Gxi in my 1988 Bayliner. The lower helm is not used - so I always use the flybridge. All of the instrumentation seems to read high - voltage always pegged high, ol pressure ru… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I recently bought a 1988 bayliner with a 2.5L 4 cyl gm engine
I recently bought a 1988 bayliner with a 2.5L 4 cyl gm engine in it,it has an omc outdrive. Some of the things wrote on the outdrive are (cobra 2000 v6). The person i bought this boat from had just ha… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
i have a mercruser 5.0 inboard and when i run 4000 rpm it runs
i have a mercruser 5.0 inboard and when i run 4000 rpm it runs hot about 190 f if i run for a period of 5 minutes or more but if i run 3000 rpm it stays below 190 f . i also have duel props on the out… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
hey name is steve 2 issues boat is a bayliner 03 2455 tierra
hey name is steve 2 issues boat is a bayliner "03 2455 tierra cruiser merc 5.0 i/o 1-merc 5.0 i/o at high speeds overheating 30 mph but when brought down to 25 mph water temp is perfect also at idle w… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
2004 had a new 350 mercruiser installed in 1980 boat always
2004 had a new 350 mercruiser installed in 1980 boat always ran at 180 heated up to 220 upon stopping told by installer of motor that it was normal. This year heated up to 200 would not cool down, sho… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have a 1988 searay with 2 454 340 hp fresh water cooled engines.
I have a 1988 searay with 2 454 340 hp fresh water cooled engines. when I bought it back in 1998 the starboard engine ran 10 degrees hotter then the port engine I replaced the raw water impeller clean… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 1986 mercruiser that overheats at idel speed. I have
I have a 1986 mercruiser that overheats at idel speed. I have changed the lower unit impeller, and thermostat with no luck. The new thermostat rating is 140 degrees, but at high speed the engine runs … read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
2000 bayliner with a 3 litre. Gauge shows 175 to over 200 ...
2000 bayliner with a 3 litre. Gauge shows 175 to over 200 degrees depending on when the thermostat is open or closed. Thrmostat and sending unit changed but made no difference. Does anyone have an ans… read more
Jeff
Jeff
Owner
Vocational, Technical or Trade Scho
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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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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.

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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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