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Old 11-22-2008, 10:21 PM
Graham's Avatar
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 3,339
Originally Posted by Gordo View Post
Ok, I realy did it this time.
Don't feel too bad. I had what was probably the wing nut off the aircleaner go through the turbo on our '85 300D which blew pieces into the cylinders and wrecked the engine.

I had had the oil changed at a quick change place and they took the air cleaner off. That's the only way I know anything could have got into turbo. At first the car was sluggish - Nut probably stuck in waste gate or turbo - Took it for an Italian tune-up to try and clear whatever was ailing and that did it! Should have heard the noise! Limped home - New rebuilt engine (that was in 2001), new paint job (2005) and car looks still drives and looks like new. But it cost me $10K!!

I would take the cylinder head off and make sure everything is OK. If money is an issue by all means try and get piece out, but don't spend any money doing it.
85 300D14 GLK250,72 350SL, 98 E320
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Old 11-25-2008, 10:28 AM
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Join Date: Sep 2006
Location: New Hampton, NH
Posts: 132
The bad:
I tried to get the prechamber out and was not able to make the bike tool method work. The knock is not constant I tried opening each injector line to isolate it as a combustion problem, but the Knock was not effected. If I am going to pull the head I might as well do everything (rings, sleeves, valves, etc). If I am going to do that it might be more cost effective to look for a decent used engine.

The good:
I drove the car and the knock became intermittent and then disappeared after about 5 miles.

I wonder if the chunk has welded itself to the piston or to the head? It has not effected the turbo (yet) which makes me think it is still in there. How soft are the pistons? Are they softer the the cast aluminum that the intake is made out of? Is there a possibility that the chunk disintegrated? I think I will keep driving and if this thing comes back to haunt me I will keep you all posted. Thanks for all your help. Next time I see my proctologist I will ask if I can borrow his endoscope.
1980 300TD with 1985 300TD Turbo motor and 240D 4 speed.
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Old 11-25-2008, 11:33 AM
Registered Hack
Join Date: Mar 2008
Posts: 4,612
Forget the prechamber, you really want to be inspecting the inside thoroughly at this point. I offered it as a fix b/c there was a chance that your intruder could be removed. The aluminum chunk is not going to melt or disintigrate, the pistons themselves are aluminum; granted they are all different alloys, the characteristics will not vary enough.

Removing the head sounds like a good idea before you go buy a whole new motor. Even if the top of the piston now has a scar on it, it will be ... ok. Minor disfuguring of the shape of the piston or the rod may have resulted if the chunk was not caught in the center. Replacing it is an option too.

Before considering any of this, you should find out what is REALLY going on. OFF WITH HER HEAD!!

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Old 11-25-2008, 11:49 AM
Diesel911's Avatar
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Join Date: Sep 2007
Location: Long Beach,CA
Posts: 24,419
What did you use to turn off the Pre-chamber retaining ring?
It could be that the Bicycle Hub Tool/Slide Hammer setup needs a very heavy slide hammer. I have seen some pics on Ebay of the complete set and the origional slide hammer is pretty big looks like the hammer part is at least 4 pounds.
84 300D, 82 Volvo 244Gl Diesel
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