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Good advice, and I won't have to pull off anything. I Googled "diesel engine popping through the exhaust" and read that the cause is the exhaust valve not opening properly and the compressed gasses are exiting the intake valve when it opens, so I turned the engine over with the stop valve closed...

Ya know, I just registered on this forum today because of the excellent information I got from Forklift's post about adjusting valves on an SP 135 Lehman. This is the first thread I've read, and gotta tell you all that I've been missing out on a great forum. Eleven years ago I couldn't decide...

Good afternoon all, My 1990 Lehman SP135 engine has developed a noise while running that sounds like an exhaust leak coming back through my air intake manifold. I noticed this once recently right after start up a month or so ago but it went away within a few minutes and didn't occur again until...

@ Forklift; Thanks for the detailed description on valve adjustment on the SP 135. It went just like you spelled out in your post. Unfortunately, it did not fix my current issue, and I will be starting a new thread regarding my issue to hopefully get a few ideas.