What's the spec for minimum compression on these engines?
Last week I took a warm engine compression test with the HF tester using the injector adapter and reported #1 was 200 psi while the rest was 300 to 325. There was a problem with the adapter and multi connections and allowed leaks. The needle never held steady after cranking.

The good news is that I have finally modified the HF setup to be leak free and very easy to use and the needle stays put! I took a reading on #1 on a cold engine via the glow plug hole and got 260 psi..

I am gonna adjust the valves then do a hot compression test and see what the numbers will be with my "new" compression test set.

I

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked