Do you leave the injector heat shields in place while checking compression - OM617 non-turbo engine? Thanks.

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

Don't you generally compression test through the glow plug holes, not the injector holes?

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
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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

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

yes.

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

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

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.

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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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz