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I have a 1990 Larson with an original mercruiser alpha 1 Gen
I have a 1990 Larson with an original mercruiser alpha 1 Gen 1 4.3 l v6 I've been having an overheating problem at low idle the temp gauge would get up to 200 to almost 250 if I didn't speed up to get… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
I have a 2003 Larson with a 4.3L V6 Mercruiser Alpha engine
I have a 2003 Larson with a 4.3L V6 Mercruiser Alpha engine – 2B carb. Problem – last year had the boat out on the water, 40-50 minutes in shut her off to drift and fish. Wouldn't restart – checked ca… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
Have 2015 Tahoe 215 starts and runs fine low throttle then
have 2015 Tahoe 215 starts and runs fine low throttle then justa after plaining out alarm starts sounding and engine power oscilates and cuts back power… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a mercruiser 4.3 raw cooled. Running on muffs the exhaust
I have a mercruiser 4.3 raw cooled. Running on muffs the exhaust water is v hot but temp gauge ok. The pipes from balls on top of thermostat housing are cold does this sound right? Thanks… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 2006 Maxum 1800 Sr3 with 4.3 mercruiser. First run
I have a 2006 Maxum 1800 Sr3 with 4.3 mercruiser. First run of the season, started great, ran fine, 20 mins in I came off cruising into neutral and the alarm started.Checked gauges (all fine), turned … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
We have a Universal Atomic Diesel Engine M-30. We are getting
We have a Universal Atomic Diesel Engine M-30. We are getting a frothy brown gunk in the coolant - it is not oily and washes off the radiator cap easily-water soluble. When we first noticed it, we flu… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I ran my 2009 Yamaha F20msh for about a hour on the lake with
I ran my 2009 Yamaha F20msh for about a hour on the lake with no inital problems. Then we shut it off and parked for for 3 hrs. When I returned and cranked it back up and took off, 10 minutes into our… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a 1999 Crownline 225 with a 454MPI. It runs great but
I have a 1999 Crownline 225 with a 454MPI. It runs great but has left me stranded the last two weekends. Here is the issue: After running on the water for an hour long boat ride, we stop for about an … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
I have a Yanmar Yanmar Marine Diesel Engine Model 4JH4-HTE.
I have a Yanmar Yanmar Marine Diesel Engine Model 4JH4-HTE. When cruising at 70% power the the water temperature (as indicated by the standard water temperature guage) increases to 220 F. This seems t… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Im looking at buying a Wellcraft 175s 1999 18 open bow boat
I'm looking at buying a Wellcraft 175s 1999 18' open bow boat w/4.3l Volvo engine. I've never owned a boat before. This is a private party purchase. Any problems w/this boat I should look out for? Tha… read more
James
James
Marine Mechanic
Vocational, Technical or Trade Scho
4,111 satisfied customers
I have. 1979 90HP Merc OB. The tell tail water discharge is
I have. 1979 90HP Merc OB. The tell tail water discharge is becoming hotter over the last two years to the point you cannot put your hand in it after the motor is run for 10 to 15 minutes. I changed t… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
Ford Mustang Boss 302 was running my ford 302 inboard engine
was running my ford 302 inboard engine the other day with hose water hook up ears...and noticed it ran kind of hot ..almost tea temp water comming out...seemed to be spitting water out exhaust dischar… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Last trip to the lake, my 96 Reinell with 305 Chevy and Alpha
Last trip to the lake, my 96 Reinell with 305 Chevy and Alpha Mercruiser outdrive ran perfectly. Last night I used my hose hook-up to test start it and something was not right. There was not any water… read more
James
James
Marine Mechanic
Vocational, Technical or Trade Scho
4,111 satisfied customers
My 4.3L V6 started fine and ran well for a half hour the first
My 4.3L V6 started fine and ran well for a half hour the first time we put her in the water this season. She then began to to choke herself out when we increased the throttle. It ran relatively smooth… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I just purchased a 1991 Larson 190 All American with a 4.3L
I just purchased a 1991 Larson 190 All American with a 4.3L i/o mercruiser engine . The boat is in great shape however the motor will not turn over the starter seems to work. We tried to manually turn… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
I just purchased a 1991 Larson 190 All American with a 4.3L
I just purchased a 1991 Larson 190 All American with a 4.3L i/o mercruiser engine . The boat is in great shape however the motor will not turn over the starter seems to work. We tried to manually turn… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I ran aground in sand with a Mercruiser 3.0 engine. Boat runs
I ran aground in sand with a Mercruiser 3.0 engine. Boat runs fine but limited exhaust water coming out of port side but strong on starboard side. Temp guage now doesn't work and engine stays real coo… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 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

22,804 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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