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Mercury 5.7 1997. Runs get until it heats up to 170 than
Runs get until it heats up to 170 than backfires and loss of power … read more
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Technical or Trade School
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1997 Mercruiser 350 Mag Tournament ski. Engine is carbonated
1997 Mercruiser 350 Mag Tournament ski. Engine is carbonated and prix 600 hrs. of all fresh water time on her. last year I had an overheat as I was leaving the dock, so I shut her down and trailered h… read more
Jason
Jason
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Vocational, Technical or Trade School
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Poor water flow out the port side exhaust. I already
Poor water flow out the port side exhaust. I already replaced risers and checked water pump. All good. Shutter is missing on port side so the old shutter might be lodged in the exhaust. Not sure how t… read more
Jason
Jason
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Vocational, Technical or Trade School
22,043 satisfied customers
My mercruiser engine raw water cooled the port riser very
hi my mercruiser engine raw water cooled the port riser very hot to touch engine temp normal… read more
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Jason
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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
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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
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(###) ###-####excellent running condition. Last week got a little
(###) ###-####excellent running condition. Last week got a little low in the anchoring spot and sucked up a ton of muk leaving the location. Ruined the starboard impeller so changed it. Boat runs exac… read more
Jason
Jason
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Vocational, Technical or Trade School
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So we swapped out the exhaust manifold on Erics port Volvo
So we swapped out the exhaust manifold on Eric's port Volvo penta 5.7L today (I think he was asking you questions at the same time I was today). We got the old gaskets scraped off and all put back tog… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 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
i have twin Mercruiser 305 ci (MIE228) in a 1978 Bertram 28
i have twin Mercruiser 305 ci (MIE228) in a 1978 Bertram 28 the port engine has been overheating with the temp gauge showing rapid increase at higher rpm, then dropping when rpms are reduced and engin… read more
Tan
Tan
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I have a 1984 sportcraft with a mercruiser 350 starboard exhaust
I have a 1984 sportcraft with a mercruiser 350 starboard exhaust hose gets and smells hot but manifold and riser do not get too hot to lay your hand on and feels the same temp as port side also temp g… read more
Jason
Jason
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Vocational, Technical or Trade School
22,043 satisfied customers
I have a mercruiser 260 350 chev engine .The starboard side
I have a mercruiser 260 350 chev engine .The starboard side of the engine is getting hot.Question is where does the thermostat go in the housing top or bottom seems to look like it could go either way… read more
Jason
Jason
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I have a 1999 Stingray with a 4.3 mercruiser sterndrive. I
I have a 1999 Stingray with a 4.3 mercruiser sterndrive. I started the engine for the first time the year ( on the trailer, with garden hose attached ). A lot lore water exited the exhaust ports on th… read more
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Jason
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Vocational, Technical or Trade School
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I just converted my yamaha stern drive manifolds to mercruiser
I just converted my yamaha stern drive manifolds to mercruiser manifolds with three inch risers and new rebuilt gm v8 5.7 litre engine. and one side is hotter than the other when i run the engine. i p… read more
James
James
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Vocational, Technical or Trade Scho
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hi, i recently purchased a 2003 rinker 232 with a 5. merc alpha
hi, i recently purchased a 2003 rinker 232 with a 5. merc alpha one. The boat was out of the water for a season and i just put it in 2 mos ago. Unknown service history. Boat runs bullet proof for a 3 … read more
Tan
Tan
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After a couple of hour run at least 3/4 throttle, my 1999 Mercruiser
After a couple of hour run at least 3/4 throttle, my 1999 Mercruiser 4.3 risers doesn't seem to be heating equally. The starboard riser seems it's normal hot to touch, while the port riser is barely w… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
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Just installed a partially dressed remanufacturered 260HP 350
Just installed a partially dressed remanufacturered 260HP 350 Chevy long block (5.7 Mercruiser). Have a Alpha 1 Gen II OD. We replaced starter, 140*thermostat and housing, GLM manifolds and risers, OD… read more
ROCKET
ROCKET
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I recently had some trouble with the starboard bank getting
I recently had some trouble with the starboard bank getting hot on my 1989 Omc 350 King Cobra. Was told it was most likely my Exhaust manifolds and risers were ready for change out and I had pulled th… read more
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ROCKET
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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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