Originally Posted by petecooke

Thanks Army. I will bring the block to the shop. That thing is a beast to lift. Nothing like a steel block.

Originally Posted by petecooke

Kerry,

Isn't that required when you put new rings in a cylinder?

Should I just use my old rings that were on the damaged piston?

Thanks for the reply.

pete

Originally Posted by t walgamuth

I would have had my machinist measure the taper and examine the bores, then if within specs he would hone it and install new rings on measured for wear good pistons after cleaning the ring grooves.

I would have him also look at the piston. It does not look that bad to me though, If he said it was good enough, I would have tried to clean it and just use the piston probably without tearing the short block down if the bores looked good.

Originally Posted by petecooke

I have a 1983 240d with zero compression on the #3 cylinder. Car has about 200k miles. All the other cylinder messure between 340-400 compression.
I pulled the motor about 6 months ago and it's been sitting in my garage since then.

I squirted some oil in the #3 cylinder and the compression instantly jumped to over 300 psi so I assumed I had bad rings/piston/cylinder.

Yesterday, I pull the valve cover and set the cam so that there was valve clearance between both the intake and exhaust valves. I assume by doing this both valves would be seated tightly and there would not be any air coming out of the intake or exhaust ports.

After doing the above, I shot forced air into the injector port and all the air came out the intake port. I did the same thing to the other cylinders and the cam/engine rotated as should happen if the valves were seated.

Now I think the problem has always been with the intake valve on #3.

The questions I have are the following:

Why would squirting oil in the #3 cylinder cause the compression to go to over 300 if the intake valve is stuck open?

Is it possible to fix this problem without removing the head?

Will a machine shop need to rebuild the head or is this something I would be able to handle with the proper tools? I do have many tools/gauges but not a commercial press.

What should be my next step in resolving this problem?

Thanks for any advise.

pete

Originally Posted by petecooke

I had a few bad valves that weren't seating perfectly. They were replaced along with all the valve stem seals. I also had the cylinders checked and they were fine. The engine is back together and running strong.

It was a serious learning experience.

Thanks for all the help.

pete