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I have a 2012 350 5.7L EFI running hot at the risers and
I have a 2012 350 5.7L EFI running hot at the risers and manifold 205 but thermo housing running at 168 … read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
3,332 satisfied customers
I have a 2005 Mercruiser 5.0 MPI, Bravo 3 with a sea water
I have a 2005 Mercruiser 5.0 MPI, Bravo 3 with a sea water cooled system. Noticed I wasn't getting a lot of water out of port side exhaust and alarm above 3000 RPM. Starting by changing impeller, but … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
Recently had manifold and risers opened and checked.
Recently had manifold and risers opened and checked. Replaced with new gaskets. At that point the engine starting overheating at idle, 225+ add a little throttle 1000rpm, it would cool off below 160. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,907 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
24,907 satisfied customers
I have a 1987 four winns with a 7.4 L mercruiser I just had
I have a 1987 four winns with a 7.4 L mercruiser I just had the engine rebuilt and I put everything on and ran it. My exhaust manifolds are getting hot so I'm wondering if I plumbed them properly. Doe… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
i have a overheat problem with a merc 8.1 horizon. One engine
i have a overheat problem with a merc 8.1 horizon. One engine runs good to about 3200 rpm and then begins to get hot. Water pressure seems high. The second engine has little water pressure and runs ho… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,907 satisfied customers
Have 2001 Baja 212 Islander with 6.2 Mercruiser MX EFI with
Have 2001 Baja 212 Islander with 6.2 Mercruiser MX EFI with Bravo One outdrive. I have noticed that the starboard riser eventually gets to hot to touch for longer than a second, the port riser is warm… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,907 satisfied customers
(###) ###-####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
Marine Mechanic
Vocational, Technical or Trade School
24,907 satisfied customers
Hi, i need to know how the sea pick up water flow thru the
Hi, i need to know how the sea pick up water flow thru the engine as only one elbow is cooled but the right one is hot.Also the stop valve inside the exhaust pipe is burn. The engine is a 5.L mercruis… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Hi. I have a 2003 Mercruiser 4.3 MPI alpha one Gen II. I recently
Hi. I have a 2003 Mercruiser 4.3 MPI alpha one Gen II. I recently performed the following maintenence: New exhaust bellows, driveshaft bellows, shift bellows, water hose, and impeller. On the test run… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
What temp should my 81' mercruiser 120 run at? IF i infrared
What temp should my 81' mercruiser 120 run at? IF i infrared temp the top of the elbow, how hot should I worry about? what is the flow rate for an mc-1 impeller, how can I test it?… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Yesterday our boat searay 260 would idle fine getting on
yesterday our boat searay 260 would idle fine getting on plane it got and the alarm would go off we got a new impeller on and a new thermostat and today it did the same thing it still idles fine but i… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 300 searay with twin 5.0 mercruisers. the water temperture
I have a 300 searay with twin 5.0 mercruisers. the water temperture is approx 175 while cruising and when under load it increases close to 200. Ihave replaced thermostats and impellers. When I had the… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a lift-kept Sea 29 in maryland with twin MCM 5.0 EfI
I have a lift-kept Sea 29 in maryland with twin MCM 5.0 EfI mercruisers 1999-2001. I want to make it easier to winterize and reuse during the winter months. I am trying to decide between the san juan … read more
KKassel
KKassel
OWNER
High School or GED
381 satisfied customers
i have a 2000 searay 280 with 7.4l. water temp. at idle is
i have a 2000 searay 280 with 7.4l. water temp. at idle is 170. at cruising speed it creeps up to around 190. It goes back to 170 at idle speed. I change the impeller and thermostat, no change. Could … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 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 am about to replace the raw water manifolds on a year 2000
I am about to replace the raw water manifolds on a year 2000 2bbl mercruiser engine /bravo 1 combination equipped with the factory mercruiser freshwater cooling kit. Engine has seawater pump low starb… read more
John White
John White
Marine Mechanic
Vocational, Technical or Trade Scho
306 satisfied customers
Hi - I have a 96 Searay w/7.4LX Merc sterndrive. Yesterday
Hi - I have a 96 Searay w/7.4LX Merc sterndrive. Yesterday it overheated while at idle in the marina (seawater impeller shot) and pegged the temp gauge. After I shut it down and let it cool a little, … read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

3,332 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

24,907 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

Noel Schembri

Noel Schembri

Marine Mechanic

2,759 satisfied customers

Advanced technical diploma

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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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