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I was on plane and noticed that I was running my 5.7
Hi, I was on plane and noticed that I was running my 5.7 Mercruiser I/O at 225 degrees. I did not hear the alarm until I went to idle. I let engine idle until engine cooled off. I went at a slow RPM b… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
Just poking around on the site. I have mercruiser 5.0 260
hi just poking around on the site. I have mercruiser 5.0 260 MPI she gets up to around 167 under 3000 rpm thought it was hot … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have a big problem I hope you can help me with. Just had
Hi Jason-This is Chris. I have a big problem I hope you can help me with. Just had my heads resurfaced on my Mercruiser 5.7 with 55 hours. It was a rebuilt that tuliped 2 valves. Ran it for a few hour… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,577 satisfied customers
Ive checked the compression, 102 and 106. Rebuilt the carb
I've checked the compression, 102 and 106. Rebuilt the carb and decarbed the motor. Started up the engine and it idled fine for about 15 minutes. Left the dock and brought to WOT with no problems, whe… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have installed two new AIC control valves before we launched
I have installed two new AIC control valves before we launched the boat this year due to the boat stalling upon start up the year before. Engines are Mercruiser 7.4 2000 models. Upon launching, the bo… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,392 satisfied customers
On a 350 carbed mercrusier, both waterpumps just replaced,
On a 350 carbed mercrusier, both waterpumps just replaced, runs hot ,sets off alarm after 45 mins at idle 700 rpms. Boat is in water, cools down to 170 after running 2000 rpms for about 4-5 mins. Shou… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 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
11,399 satisfied customers
My boat and motor are at my dock. With all the hight temps
My boat and motor are at my dock. With all the hight temps the water is real low and I have a lot of silt and weeds by the dock. I used the boat yesterday (Saturday) and did not have any trouble with … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
Met cruiser 502 with a 160 thermostat. Boat ran aground intake
Met cruiser 502 with a 160 thermostat. Boat ran aground intake filled with sand. Engine overheated. Alarm went off, i immediately shut down. I saw the intake filled with sand, cleaned it off. Restarte… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a 1986 Mercruiser 230 v8 engine. I just recently had
I have a 1986 Mercruiser 230 v8 engine. I just recently had a new water pump, starter and exhaust fan installed. The third time out since the repair I noticed that the exhaust fan starting having a lo… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
1996 Sea Ray with 1999 Mercruiser 5.7 L 350 Magnum. Engine
1996 Sea Ray with 1999 Mercruiser 5.7 L 350 Magnum. Engine starts easily cold and will run for hours at 3,000 rpm at the dock. shut engine down for half an hour and either will not start or starts and… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hello again!, Tonights question is Have I damaged my newly
Hello again!, Tonight's question is "Have I damaged my newly rebuilt Mercruiser engine?" Both of my "Big block" Mercruiser engines were rebuilt last summer. During the winter I often run them while st… read more
Scott Martin
Scott Martin
Service manager
Vocational, Technical or Trade Scho
167 satisfied customers
i have 2006 5.7 mercruiser starts great runs ok till i open
i have 2006 5.7 mercruiser starts great runs ok till i open full throttle get up on plan five minites then starts to backfire i shut it down to 2200 rpms and limp back to marine changed spark plugs di… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I HAVE A INBOARD OUT BOARD 5.7 MERCRUISER. AT HIGH SPEED THE
I HAVE A INBOARD OUT BOARD 5.7 MERCRUISER. AT HIGH SPEED THE ENGINE TEMP GOES UP TO 195 DEGREES AND THE ENGINE SHUTS DOWN. THE TEMP STAY AT 160 AT LOW TO MEDIUM SPEED. ANY HELP WOULD BE GREAT… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
Hi, when I launched my 18 boat with a 4 cyl MercCruiser I/O
Hi, when I launched my 18' boat with a 4 cyl MercCruiser I/O engine, I didn't realize I left out the drain plug. I left the boat for about 15-20 minutes. When I got back I heard the bilge running and … 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 2003 Chaparral 230 SSI w/ a Mercruiser I/O w/ about
I have a 2003 Chaparral 230 SSI w/ a Mercruiser I/O w/ about 80 hours on it. It was serviced and winterized in November 08. I put the boat in and ran for about 10 minutes at which time we began to sme… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
374 satisfied customers
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
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
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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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