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I have a slickcraft in/out with a mercruser 350 and a alpha
I have a slickcraft in/out with a mercruser 350 and a alpha one outdrive that is overheating since we replaced the outdrive with a new alpha one with a new stainless prop. Under idle and low rpms it h… read more
Jason
Jason
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Vocational, Technical or Trade School
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Have a re built 5.7 Mercruiser that over heats after 3000
Have a re built 5.7 Mercruiser that over heats after 3000 rpm. risers look clear new outdrive. last time had it out left side felt hotter then right … read more
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Jason
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Freshwater cooled mercruiser bravo 5.7 overheats under load
i have a freshwater cooled 1999 mercruiser bravo 5.7 that overheats under load (really quickly). It will not overheat on the mooring at fast idle. I have replaced the raw water pump, manifolds / riser… read more
Noel Schembri
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Greetings, I am working on a 1989 Mercruiser Alpha One with
Greetings, I am working on a 1989 Mercruiser Alpha One with 5.7 GM. I would like to convert the stock thermostat housing which has 6 ports and sets quite high on the intake manifold, to the newer, low… read more
Tan
Tan
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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
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Mercruiser 4.3LX V6 with Alpha Gen 2 drives. Thunderbolt Ignition.
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Tan
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I have a 06 mercruiser/alpha with a closed cooled system went
I have a 06 mercruiser/alpha with a closed cooled system went to run it after 2 weeks and it overheated no water to the heat exchanger the pump on the sterndrive is working the impeller on the engine … read more
James
James
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I have a 1993 Merc 350 Magnum 5.7 L with Alpha 1 outdrive.
I have a 1993 Merc 350 Magnum 5.7 L with Alpha 1 outdrive. Engine overheats under heavy throttle (usually runs about 170 according to gauge), but not while keeping below 3000 rpm. Checked flow from ou… read more
Tan
Tan
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I have and alpha 1 Mercruiser. I see crank raw water pumps
I have and alpha 1 Mercruiser. I see crank raw water pumps for boats. Is there one of these pump kits made for the Alpha so I dont have to get into the outdrive to fix an impeller? I would like to cha… read more
Tan
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I have restored a 1974 Chris Craft XK-19 boat. Fresh water
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Whitecap36
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I have a 78 Mercruiser 305 chevy ser #4975730, I would like
I have a 78 Mercruiser 305 chevy ser #4975730, I would like to get a diagram on coolant hose routing and thermostat location (above center block or in intake manifold). Engine overheats at full thrott… read more
Tan
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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.
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What is the correct gear ratio for the outdrive on a MCM 5.7Lv8
What is the correct gear ratio for the outdrive on a MCM 5.7Lv8 the boat is a Rinker, Engine serial # XXXXX Trans serial # XXXXX there is a 1.84:1 on at the moment but we think it has been changed, an… read more
capt ron 1959
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i have an 1985 mercruiser 5.7 alfa1 outdrive it overheat at
i have an 1985 mercruiser 5.7 alfa1 outdrive it overheat at idle and at high rpms. if you stop the flow of water to the elbows it runs normal temp and the temp at the elbows is 160degrees.… read more
shane j forrest
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I have an 1989 17 vip boat. It has a 2.3l engine with an omc
I have an 1989 17' vip boat. It has a 2.3l engine with an omc outdrive. I know there is a conversion to make it a mercrcruiser outdrive. What I need to know is which particular outdrive and conversion… read more
Dominick
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i have a 5.7 l mercruiser inboard that is overheating at trolling
i have a 5.7 l mercruiser inboard that is overheating at trolling speed only. changed the impeller and it's still happening. runs cool at higher rpms in fact if it starts to climb when trolling 2.5 mp… read more
ROCKET
ROCKET
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I have a 5.0l Mercruiser. A few minutes after starting the
I have a 5.0l Mercruiser. A few minutes after starting the engine, the water from the thermostat housing to the engine water circulating pump, and the starboard manifold becomes very hot, the water to… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
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
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Meet the Experts:

Ted G.

Ted G.

Marine Mechanic

4,115 satisfied customers

40 years experience, Safe boating instruct., Failure Analysis, Expert Witness

Dominick

Dominick

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John White

John White

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11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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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

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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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