Compression test on 85-92 diesels

Jul 17, 2003 3 Replies

I made a compression tester out of an old injector. What kind of reading should I get? I tried it on an 84 turbo diesel that I couldn't get started and got a maximum of 240 psi even after pouring a bit of oil in the cylinders.



stan



It's been awhile but from memory the factory compression min was somewhere around 300psi. At 300 starting required very good glow plugs and a good battery(fast)! The new spec was close to 400psi.

Hi

Thanks fo rthe reply. Does a warm vs cold engine make a big difference?

stan

JackT wrote:

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