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Mid 80s mercruiser inboard 305 4 barrel. Raw water cooled,
Mid 80s mercruiser inboard 305 4 barrel. Raw water cooled, only fresh water for life of boat. Replaced manifolds Ans risers last year no problem. Replaced impeller sender and have tried with 2 known g… read more
DavidJ25
DavidJ25
Marine Mechanic Supervisor
Vocational, Technical or Trade School
53 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
Vocational, Technical or Trade School
22,804 satisfied customers
Have a 454 Crusader engine which is overheating a bit and
Have a 454 Crusader engine which is overheating a bit and blowing stream . When it reaches about 180 I drop rpm and stays around 160 . All liquid levels are fine . No milky oil . Checked impeller it's… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
I have a 2006 Crownline 202 with a volvo pent 5.0. It has
I have a 2006 Crownline 202 with a volvo pent 5.0. It has always performed well, but last season I had trouble with overheating. The temp gauge would get to about 196 degrees and the alarm would sound… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I just repowered my 28 bertram with two reman 5.7's these are
i just repowered my 28 bertram with two reman 5.7's these are the older block 010 gm's (pre vortec). i have new risers, manifolds, raw water pump, and all hoses are new. the boat is fresh water cooled… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 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
11,507 satisfied customers
i have a volvo penta 3.0 gs marine engine that is building
i have a volvo penta 3.0 gs marine engine that is building alot of water pressure through out the cooling system has blown a ciculator pump hose . motor keeps a good temp at 150 degrees and thermostat… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a over heating problem on my 350 mpi merc br 3. I have
I have a over heating problem on my 350 mpi merc br 3. I have changed the raw water pump and risers and the thermostat. This is not in the water. It is on mufs. had the problem last year and changed i… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
One of my engines is overheating at a slow rate. The raw water
One of my engines is overheating at a slow rate. The raw water cooled engine temperature normally sits at 175 degrees, but has been increasing slowing (over past 8 months) to 200 degrees at present. R… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer I noticed it was running hotter than what I remembered....~190-200. I checked the impeller and it looked OK. I replaced the thermostat … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
1988 big block 454, 34 searay, idle it runs fine 140-145,
1988 big block 454, 34 searay, idle it runs fine 140-145, good water flow out both exhausts,any power the temp max spike right away 202+ I have to shut it down right away. New impeller, new thermostat… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 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 a 1989 mastercraft tristar boat. The boat is running
I have a 1989 mastercraft tristar boat. The boat is running hot, 200-220 F. I take the thermostat out and it runs cool 130 F. I put in two different 143 F thermostats and no change. I did a water flow… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
I have a mercruiser 5.7L engine. aside from the choke unit,
I have a mercruiser 5.7L engine. aside from the choke unit, is the intake manifold the same as an automotive? I searching for a running hot situation, with all raw water components being new. (manifol… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
what is the normal operating temperature for exhaust manifolds
what is the normal operating temperature for exhaust manifolds for a 1995 mercruiser 5.0lx… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a over heating problem with a 260 hp Mercruiser chevy
I have a over heating problem with a 260 hp Mercruiser chevy thru the hull drive engine.It is overheating so I removed the thermostat,boats in Miami,still over heats and the cooling water is black and… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 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
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
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