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Old 12-17-2003, 11:47 AM
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Join Date: Jun 2000
Posts: 45
diesel woe: rattling noise

On my 300D sedan, I am getting a nasty knocking noise from the engine.

sounds like "tang tang tang tang", like metal hitting metal. It increases in speed with engine speed.


more apparent when the car is not fully warmed up.

only happens on take off, when engine is under load, but at low RPM. Once cruising over 40 mph, it goes away.

fuel injectors?
could a cracked prechamber make this happen?

chain stretch?
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Old 12-17-2003, 11:52 AM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Most likely injector knock, could also be a bad chain tensioner.

While idleing, loosen the cap nut on the injectors one at a time. If the knock goes away when you loosen one, chances are it's a bad injector. If it doesn't, suspect something else.

Sadly, new injectors don't always fix knocking, and if fact can make it worse if something else is the cause.

Low compression from tight valves will also cause knock, so will late injection timing.

Check the timting chain for stretch (do a search) and adjust the valves, too.

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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