350 Mercruiser Engine full of water

84EdH

Chief Petty Officer
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Apr 30, 2011
Messages
575
Hi, I am new to the forum, but have been reading great info on this site for a while. Sorry for the long post

I bought a 1995 Alpha 1 350 Mercruiser for parts as the engine was listed "as low hour engine with cracked block do to only partial winterization" (the block drain plugs were not opened, but the manifold plugs were).((supposedly).

When I went to look at the engine, the guy actually started it on a motor stand and it sounded better than my car! Once home, I went over the external engine which looks almost new with hoses, belts, pulleys, carb etc. all appearing excellent. Oil was clean and full. It started and ran as previous. (started for just a few minutes without water).

I thought maybe I will just get this crack in the block fixed.....and have a good engine, instead of buying a new long block to power my old 1979 Century 3000.

Well, this is what happened. I hooked up the garden hose to the inlet hose leading to the power steering cooler. The water was running while I hooked up fuel and a battery to run it on my engine stand. Before I started the engine, I started hearing water running onto the garage floor from the breather hoses from the valve covers, and somewhere under the bell housing. The valve covers actually filled up with water, as well as the oil pan.

Obviously, this is not good.

Then I thought maybe, just maybe, because the engine was not running, and water was being forced into the engine with garden hose pressure it may have found a way into the engine compartment without there being a fatal crack or cracks internally...........Any chance? Or am I back to a parts engine?

I appreciate any help.

Ed
 

Bondo

Moderator
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Apr 17, 2002
Messages
71,157
Re: 350 Mercruiser Engine full of water

Any chance? Or am I back to a parts engine?

Ayuh,... Welcome Aboard,...

Sorry to burst yer bubble Ed,...

Ya still need a New motor...
 

84EdH

Chief Petty Officer
Joined
Apr 30, 2011
Messages
575
Re: 350 Mercruiser Engine full of water

Update: I tore the engine apart today and found broken, not cracked, block on both sides of engine underneath the intake manifold. Jagged edges and side walls pushed in 1/4 inch. Water was coming out of the head bolt holes....

The heads and pistons look almost new.

Should I buy a long block or buy a bare block and switch parts?
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,337
Re: 350 Mercruiser Engine full of water

the block probably has more internal damage than what you found - needless to say its junk

the internal engine parts are probably all okay, tear it down and inspect all parts - specs are in the OEM manual

you probably can just swap out the parts into a new block, dunno bout the heads though, there could have been water in em too
 

Bondo

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Messages
71,157
Re: 350 Mercruiser Engine full of water

Should I buy a long block or buy a bare block and switch parts?

Ayuh,... Unless yer an accomplished engine builder,...
Buy a Long Block, 'n do the swap...
 

84EdH

Chief Petty Officer
Joined
Apr 30, 2011
Messages
575
Re: 350 Mercruiser Engine full of water

I am not an accomplished engine builder but I love learning the art. the longblock works for me this time. I live near Pittsburgh and our boating season is all too short!

I have some questions about which engine year to purchase, but I will start another thread when I have my questions ready.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,157
Re: 350 Mercruiser Engine full of water

I am not an accomplished engine builder but I love learning the art. the longblock works for me this time. I live near Pittsburgh and our boating season is all too short!

I have some questions about which engine year to purchase, but I will start another thread when I have my questions ready.

Ayuh,... Buy a 96, 'n newer long block, with the vortec heads, along with a matching intake manifold...
It's an Honest 20hp upgrade over yer 95, non-vortec heads...
 
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