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Name:   Shortbus - Email Member
Subject:   Mercruiser 4.3l Alpha 1 gen 2 overheat
Date:   6/1/2018 3:40:53 PM

Was idling engine and starboard riser was getting too hot to touch, port cool.

Engine usually never over 150 was at 180-185.

Replaced 7 year old impeller.

Boat running at 35 mph temp 175.

Cold risers just after running long and fast.

Idle seems to bring engine temp down to 140-150 but starboard riser will get warmer than the other, maybe hot if idles long enough.

Have ordered riser gasket and thermostat kit.  All running fine after impeller but temp not as low as it was.

Any boat geniuses out there?





Name:   GoneFishin - Email Member
Subject:   Mercruiser 4.3l Alpha 1 gen 2 overheat
Date:   6/1/2018 4:58:58 PM

Yes...his name is CAT.. 





Name:   CAT BOAT - Email Member
Subject:   Mercruiser 4.3l Alpha 1 gen 2 overheat
Date:   6/2/2018 9:38:25 AM

HHHHMMMM

 





Name:   GoneFishin - Email Member
Subject:   Mercruiser 4.3l Alpha 1 gen 2 overheat
Date:   6/3/2018 8:26:35 AM

HHHHMMMM=MAKE AN APPOINTMENT





Name:   Shortbus - Email Member
Subject:   Mercruiser 4.3l Alpha 1 gen 2 overheat
Date:   6/3/2018 9:06:45 AM

Steve and Goofy, grab a seat and popcorn. 

I can turn some bolts and shotgun parts way quicker than getting it to you & back.

Did the impeller myself with a buddy's help.

 

Stay tuned!  Some boat repairs! Same boat channel!       (batman theme)





Name:   Shortbus - Email Member
Subject:   Mercruiser 4.3l Alpha 1 gen 2 overheat
Date:   6/7/2018 4:10:06 PM (updated 6/7/2018 4:31:07 PM)

Chapter two. 

 

After impeller and thermostat, engine is running at the proper 140 degrees.

Starboard riser still hotter than port enough for concern.

 

So I call Mercruiser and they answered the phone!

Further the lady answered all my questions with grace and expertise!

Turns out that a hotter Starboard riser is designed in and normal.

She said if you can keep your hand on it, its ok.

I guess its ok then.

 

Well the boat needed all that was done to it, so time to clean it up.

 

And that is the end of the story   -   hopefully.







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