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Old 04-29-2005, 11:14 AM
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Planning on replacing the pre-chamber seals on 85 300D, anyone else done it?

I'm planning on replacing the pre-chamber seals on my 300D and I was wondering if anyone has done the same and if there's anything to pay particular attention while doing it. I bought the tools recently so it shouldn't be too hard.
I think I have a leaking seal on #5 cylinder since the compression reading was lower on it than the rest. I've seen some bubbles around the ring when I had a fuel leak on that injector so I'm assuming I need to replace it. I plan on replacing all the seals while I'm at it, if they're not too expensive. I'll also clean and inspect the prechambers at the same time as well.

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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 04-29-2005, 11:24 AM
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DJ,

Having been a factory trained MB mechanic for 30 years, I can't think of one good reason to waste the time doing what you plan to do. The little bubbles are normal and have nothing to do with your compression.

Peter
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Old 04-29-2005, 03:53 PM
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I was thinking the bubbles were indicating some kind of seapage. The compression in cylinder #5 is coincidently nearly 100 PSI less than #1.

Readings were:#1 to #5
380, 380, 380, 340 and 295
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Old 04-29-2005, 03:59 PM
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If the prechamber seals were the primary cause of that compression values, I think you'd be able to feel and/or hear the combustion gases RACING out of there. If it were me, I'd be double checking valve clearances first.
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Old 04-29-2005, 04:23 PM
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The values were taken after a correct valve adjustment.

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