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What did you do with your GMT400 today...or yesterday....

They look like they are a much better design than the button type. springs keep them in place, I guess one of those springs would have to break for them to walk off the valve or push rod. Not sure if they are cast iron or aluminum, I would need to clean them off to see.

Heads will need to come off to see if the valves are the problem or the heads are cracked, but worst case scnario I have the heads that are on the other 6.2 or the heads that are on the 6.5 that's in 93. I know the ones in my 93 don't have coolant issues and the engine runs so that's a plus I guess. the other 6.2 will also run and had a round about 250-280 compression but I never hooked a cooling system to it, only ran the garden hose through it to run the engine for a while on the stand.
 
looking at some of the things on this early 6.2 being the rockers and the starter bracket both which seem a lot stronger it would seem like GM put in a lot of effort in designing these diesels in the beginning and then cheaped out on a lot once they were out on the market! Dam those GM bean counters!!
 
I was give a case W9 loader. Engine was seized. Pulled injectors, knocker loose into each cylinder. It tirned over a 1/4 turn after about a week.
Its a four cylinder.
Valve stems is rusted into the guides.
I got back to work and never had a chance to finish getting the hood removed(cab and fuel tank filler is holding it from sliding back far enough) so to get the rocker covers removed.
I have a few days off work now so hope I can get back out there and see if them valve stems can be gently made to move.
That was the problem @dbrannon79 s engine
 
I had thought about it this morning of trying something that would help dissolve carbon like some berrymans B12 spray into the intake ports of the head, then using my blow gun in the port while tapping on the valve stem. if it's carbon deposits and they can be cleared that way maybe I won't have to pull the heads right away.
 
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