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I recently replaced my impeller and thermostat in my
Hi I recently replaced my impeller and thermostat in my mercruiser 502. Boat has been running great and between 165-175 water temps, then the other day it spiked up to about 190 within a minute of tak… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I HAVE A MERCRUISER 350 MAG THE ENGINE TEMPERTURE GOES FROM
I HAVE A MERCRUISER 350 MAG THE ENGINE TEMPERTURE GOES FROM 100 TO 250 IN 15 MIN THEN ALARM GOES OFF . I KEPT BOAT IN A FLUSING MODE FOR 20 MIN WITH WATER RUNNING AND ALARM DID NOT GO OFF … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 1987 sea ray with twin 5.7's that I just bought.
Hello, I have a 1987 sea ray with twin 5.7's that I just bought. The port engine is overheating at idle speeds and it's losing fluid. Ive seen it boil out of the cap, also boiling into the overflow an… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
Went in a sea Ray boat and it's beeps really loud and then
Went in a sea Ray boat and it's beeps really loud and then says Mercury , engine hot and then now says overheating … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I own a 2012 sea ray 280 with Mercury 350 mag seacore. Put
I own a 2012 sea ray 280 with Mercury 350 mag seacore. Put in water yesterday. After about 20 min high temp alarm with guardian mode activated. Dash gauge shows a normal engine temp. No boiling over, … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Hi, I own a 2008 185 sport w/3.0L TKS Alpha type Mercruiser
Hi, I own a 2008 185 sport w/3.0L TKS Alpha type Mercruiser 4 cyl motor. To date it has 80 hrs on the clock and I've been miticulous about winterizing and servicing the fluids except for the cooling s… 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
My 5.0 2004 merc cruiser in a 24 sea ray sundeck has intermittent
My 5.0 2004 merc cruiser in a 24' sea ray sundeck has intermittent overheating. ranges from 155 to 185. does not get much hotter than 185 but of course alarm spounds arount 177. Did this last week so … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Tan went for a test run on the 25 outlaw -- speedometer works
Tan went for a test run on the 25 outlaw -- speedometer works fine thanks for the help there -- oil pressure 40 psi -- water temp 170 -- charging good -- stopped and put fuel in her prior to launch --… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
What is better for power a 3.0l mercruiser inboard (2006) or
What is better for power a 3.0l mercruiser inboard (2006) or an evinrude 115hp outboard (2007) and why??… read more
KKassel
KKassel
OWNER
High School or GED
381 satisfied customers
i have a mercury black max,. 2 stroke, oil injected outboard
i have a mercury black max,. 2 stroke, oil injected outboard 150 - 175 hp. when the boat is under load and travelling at top speed (approx 30 kots) the temerature guageshows engine runing cool then wh… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
5.7L 350, OF601827,stern drive Alpha/gen. The impeller,both
5.7L 350, OF601827,stern drive Alpha/gen. The impeller,both manifolds & risers,thermostat,water pump have been replaced(new) this month. The engine still heats til the alarm goes off as the temp rises… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
-Boat; 1989 Sea Ray Sundancer 280 w/ 5.7L v-8, Alpha One outdrives -Problem
-Boat; 1989 Sea Ray Sundancer 280 w/ 5.7L v-8, Alpha One outdrives -Problem - Portside engine begins to run hot under load. Idle and cruising upto 3100 rpm - no problems. When I hammer throttle (3200 … read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 1983 145hp Volvo inboard -outboard. Never had any
I have a 1983 145hp Volvo inboard -outboard. Never had any problems. This year I had the fresh water cap assembly changed. the threads were broken off. first run in the lake it over heated. They( the … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Chevrolet 350 Cu inch marie engine inboard / outboard - overheat
Chevrolet 350 Cu inch marie engine inboard / outboard - overheat horn comes on when started, goes off when underway, temp gauge does not go too high. where are intakes to check cleanliness? how to che… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I just baught a 1987 Sea sport. Volvo penta 290a/200f 305.
I just baught a 1987 Sea sport. Volvo penta 290a/200f 305. Test drove it twice and it ran great. Got it home drove it away from the dock after i warmed it up and brought it up on a plane and ran it @ … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
I am trying to replace my impellar on a 350mag Mercruiser engine.
I am trying to replace my impellar on a 350mag Mercruiser engine. I haven't replaced it since I bought the boat in 2005. My question is, do I need to replace it and where is it? Is it behind the recir… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have a chevy 350 in my 1998 Supra ski boat. It runs hot ...
I have a chevy 350 in my 1998 Supra ski boat. It runs hot at idle speed only. When unloading it off the trailer it has a tendancy to run up to 200 sometimes 225 degrees until I can get it outside the … read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 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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