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Old 07-06-2002, 10:30 PM
Don Drake
Posts: n/a
Exclamation Trouble At First Starting

Purchased 1980, 300d, non-turbo diesel on Ebay yesterday. Today when I saw it for the first time I had a problem. All fluid levels checked OK. Oil level looked tobe 1 to 2 Qt's HIGH. It started but is a HUGE Knock up in the front part of the Engine. I Turned it off right away! Could this be timing Belt or fuel pump out of time. I plan to haul to a MB expert next Mon.
Thanks for the help!!! Don Drake
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Old 07-06-2002, 10:39 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
It has a timing chain, not a belt. Could be the chain, or any of the other items which would apply to a gas engine, such as a rod or piston wear problem.
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Old 07-07-2002, 06:41 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I have heard of MB engines running with the piston completely gone, just the rod thrashing around in the bore. PO (it was a new owner who brought it in) claimed he "didn't hear anything funny -- it just runs rough"

Serious knock up front can be a dead chain tensioner letting the chain slap, a bad piston/rod, etc. Can't give much advice without actually hearing the noise. I'd for sure not run it!

I suppose a hole in a piston would allow diesel fuel to accumulate in the crankcase -- you'd be able to smell it in the oil.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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