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I Have a 2009 3360 regal with 2 8.1GiE-K volvo penta's in
I Have a 2009 3360 regal with 2 8.1GiE-K volvo penta's in it. On of the engines is exhibiting erratic temperature fluctuations. After the engine has been running for a while, at least 20 minutes under a load, the temp will fluctuate from 200 degrees to less than 100 degrees in less than 20 seconds. I don't think the engine can physically change this much in such a short amount of time. Any ideas, temp sensors, temp switch? I'm not sure how the sensors in the risers interact with the temp switch in the thermostat housing. … read more
Jason
Jason
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Vocational, Technical or Trade School
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I HAVE 89 MERCRUISER WITH BIG BLOCK, 3 YEARS AGO I CONVERTED
HELLO , I HAVE 89 MERCRUISER WITH BIG BLOCK, 3 YEARS AGO I CONVERTED IT TO ***** MANIFOLDS COOLANT RISERS FRESH WATER COOLED HAS BEEN COOLING PERFECTLY THE MANIFOLDS I HAD USED AT THE TIME WERE USED A… read more
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One engine on a dual installation shows temp drop on gage
one engine on a dual installation shows temp drop on gage when up on plane..GM 5.7 EFI mercruisers with Bravo III outdrives. That engine I replaced the themostat the same issue.replaced the sending un… read more
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Jason
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I have a pair of 5.7's V8 Crusaders in a boat I just had
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Tan
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I just put my 89 Merc 350 in the slip and had a lot of smoke
I just put my 89 Merc 350 in the slip and had a lot of smoke coming out. I thought it was fogging oil, but it continued to smoke. Took it on a 1/4 mi run and engine started to load up and stalled. Got… read more
Jason
Jason
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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
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454 fresh water cooled crusaders. Question: will water in
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Jeremy R.
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Ive got a 1995 Sea Ray with a 5.7 Bravo,the engine was replaced
I've got a 1995 Sea Ray with a 5.7 Bravo,the engine was replaced back in 2003, the temperature gauge stays at 150 degrees here lately, seems it used to get to 150 for about 20 seconds then drop down t… read more
Jason
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Tan My starboard engine runs about 20 degrees hotter than
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Tan
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I am in the process of buying a 1995 Carver 355 with 454 crusaders
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Tan
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I started the boat for the first time this season. It stated
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Jason
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I have 1996 volvo penta 4.3 moter in my boat and i just replaced
I have 1996 volvo penta 4.3 moter in my boat and i just replaced the Thermostat and the rubber impeller and it doesnt ever rich 160 degrees it runs cold all the time… read more
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I have a 7.4 mercruiser fuel injected with a bravo 3 outdrive.
I have a 7.4 mercruiser fuel injected with a bravo 3 outdrive. It is raw water cooled with raw water pump below alternator. the engine would start to run hot when I went over 2500 rpm. I took thermost… read more
Tan
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Hi I have a 02 496 merc portside exhaust not much water coming
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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.
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I have a 3.0 Litre merc inboard it is running hot at 3800 RPM
I have a 3.0 Litre merc inboard it is running hot at 3800 RPM about (normal running RPM ) I slow down to 3200 RPM and temp drops to normal 160 degree… read more
Tan
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I have a Crusader 454 330 hp overheating. Older engines. Replaced
I have a Crusader 454 330 hp overheating. Older engines. Replaced manifolds and risers 2 yrs ago. Also replaced U cooler, and water pump. Replaced zincs and ran acid through u cooler and heat exchange… read more
Noel Schembri
Noel Schembri
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I have a 5.7 fuel injected I believe about 270 HP factory installed
I have a 5.7 fuel injected I believe about 270 HP factory installed original in a 2000 WA250 Sportcraft engine is running about 190-200 degrees usually stays about 170 this has been a gradual increase… read more
Mechman45
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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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