Compression pressures

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Mar 22, 2008 | 11:04 AM

BLK_RAM

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From: Upstate Ny.

Compression pressures

Could someone chime in and tell me what the are the allowable compression pressures on a early 1st generation 89 12valve Cummins. I can't find any info on those spec's in my service manual.

Mar 22, 2008 | 12:57 PM

bgilbert

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From: Terre Haute,IN

Minimum 300 psi old engine, minimum 350psi new engine. No more than 100psi difference in any cylinder. Expect to see 350-450psi.

Mar 22, 2008 | 02:07 PM

big stinky

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From: Vancouver island

how does one check the compression? Through the injector hole?

Mar 22, 2008 | 04:54 PM

jogl

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From: SW Ontario, Canada

Yes, through the injector hole.

Need to buy, or make up out of an old injector, an adapter.

JP.

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