Engine problem or normal?

Middle top of driver side.
 

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While not ideal, a crack in that location (and other stud to water jacket) locations are not considered job stoppers.

Mart.
 
Although I have never seem a crack there (my "part number" cracks are always in their usual location), I agree with "Mart" that that particular crack is not a "game-stopper". While I'm no expert, I wonder if the installation of a quality thread insert ("Keen-Sert". "EZ-Lok", or some such)may not be a good idea.
 
Maybe I could get more specifics on this. I’m ready to pull it and trash the block because I thought it was no good do to this issue. I’m getting exhauste gas into the cooling system, motor is in truck and didn’t think I had other options?
 
Maybe it is a job stopper, then, do you think the crack goes all the way into the exhaust port? It's hard to offer definitive advice via the computer without seeing the parts first hand and discussing with the person with the problem. I wonder if it would be worth rigging up for a pressure test??

The post above is the first mention of exhaust in the coolant.

Mart.
 
Under the deck the material is round and then becomes the exhaust runner.
Not to uncommon that deck and exhaust splits when it cracks in the thin part around the stud...and exhaust is coming up into the coolant. That can be fixed with a longer stud or thread insert.
If the cracks showing goes straight all the way down into the exhaust it´s more of a challenge.
 
I don't know if I would rely on the exhaust gas test. I had a friend who had a positive test. He removed the engine and tore it down to build a new block. I pressure tested the old block for him and found no problem. I rebuilt the engine and it has been running for 2 years with no problems.
 
flatjack9 said:
I don't know if I would rely on the exhaust gas test. I had a friend who had a positive test. He removed the engine and tore it down to build a new block. I pressure tested the old block for him and found no problem. I rebuilt the engine and it has been running for 2 years with no problems.
Click to expand...

I know this a question that really can’t be answered but the above message causes me to worry about pulling the motor. I’m at a point now where I’m ready to pull it out and go through it. Before I do has anyone had any experience like I listed above when they were running no thermostats? Didn’t know if not haveing them in, and there being no restrictions would cause guild to overflow when I give it gas at idol?
 
I don't think the little coolant lose is a issue ,they do drop a little as has been said you should be focusing on if its over heating or not ,its not wise to pull a motor to bits with out doing some testing, you put a catch can on the tube and see how much you get .A thermostat can add to your problems not nessarly help .The oil pressure I have a simler problem on a merc block, 5 at idal 15 at revs , so Manual gauge goes on next ,Ted
 
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