4.3 mxm locked up

moserofmt

Recruit
Joined
Apr 14, 2013
Messages
5
Oooofta

All I wanted to do was replace the thermostat. I fired the motor up and it locked. I pulled off the sterndrive it's clear, pulled the timing chain cover, cam will move but not the crank, pulled the starter and its clear. What else could it be besides a broken crank? sounds like the engine has to be removed one way or another unless anyone knows or has another idea?

Thanks

1994 4.3 mxm mercruiser
 

fuzzybob

Petty Officer 1st Class
Joined
Oct 26, 2008
Messages
213
Re: 4.3 mxm locked up

Hi, welcome to iboats,

You might try pulling the spark plugs then turning the engine over..... could have water in the cylinders locking it up.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 4.3 mxm locked up

Pull the spark plugs and see if there is water in the cylinders. aka hydrolock.

what's an mxm ?
 

moserofmt

Recruit
Joined
Apr 14, 2013
Messages
5
Re: 4.3 mxm locked up

All spark plugs were pulled previously, no water came out ,

mxm mcm ???
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,111
Re: 4.3 mxm locked up

pull the valve cover to see if all 12 valves are still there
 
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