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-   -   Simple compression test question - '78 300D (http://www.peachparts.com/shopforum/showthread.php?t=222115)

rgnprof 05-12-2008 08:05 PM
Simple compression test question - '78 300D
 
Do you leave the injector heat shields in place while checking compression - OM617 non-turbo engine? Thanks.

ryan

jkoebel 05-12-2008 08:11 PM
Don't you generally compression test through the glow plug holes, not the injector holes?

rgnprof 05-12-2008 08:40 PM
I tried that - just couldn't get my gauge hooked up to 4 and 5 - this is actually easier and I was pulling and rebuilding the nozzles anyway.

ryan

ForcedInduction 05-12-2008 09:34 PM
Quote:
Originally Posted by rgnprof (Post 1853040)
Do you leave the injector heat shields in place while checking compression - OM617 non-turbo engine? Thanks.
yes.

rgnprof 05-13-2008 08:58 AM
Thanks. That's what I thought, but when I went to test cylinder 1, I think the heat shields blew out of some of the other cylinders and I didn't even notice (found several on the ground underneath and in the engine compartment).

ryan

chasinthesun 05-13-2008 12:59 PM
Oh boy ,yes ,I think its happened to all of us,only some wont admit it.Youll need new ones ,thats recommended .Next time get a magnet stick and pluck em out,its easy enough .The wedge side goes down.

nhdoc 05-13-2008 01:05 PM
my tester makes a good seal at the top of the prechamber and I didn't use a heat shield when I tested mine and all seemed OK. I don't know why you would need to use them to do a compression test.


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