Quote:
Originally Posted by WVOtoGO
Can’t say much on the G Wagon issue. Sorry.
But, I will mention a thing or two on your GM issue.
I can’t see a piece of a GP knocking a hole in a piston.
If you did a compression test and found little/no compression in a particular cylinder. Pull the rocker cover and check that you didn’t just break one of the little plastic/nylon keepers that hold the rocker over the valve and pushrod. If that’s the case (Quite common. We did a 6.5l rebuild due to this issue.), then hope/pray that the pushrod is still there. If so, it’s a $5.00 quick fix. If it (pushrod) hopped up and went down an oil return port (as with the #3 intake on our 6.5L) and got wrapped up in the crank, than it’s a bit bigger job to fix. That is... Assuming you do want to see what it could have done to the skirt of another piston before it wound up in the oil pan (that it knocked a hole in). 
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I appreciate that advice. I actually did take the rocker covers off this weekend hoping that it would be a simple problem like that. Unfortunately everything looks ok with the rockers/pushrods. I am no expert, but I could see that they were all there and nice and tight. It actually runs, it just blows smoke out the oil filler like a steam train. It ticks and blows smoke at the same time. Not much out of the exhaust, but it looks like some oil is working its way out one of the tailpipes, I guess the exhaust is really saturated with engine oil.
In the end I think I will fix it and give up my dream of a diesel G. I have too much money into it and the body is in good shape so if I can get 5 more years with a rebuild it would make sense to do it.