mercedes 603 diesel engine

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kpb70 - 02 Sep 2005 19:29 GMT

i have just bought a 300d gd g wagon fitted with a 603 non turbo diesel
engine.i have just fitted new cam followers and new injectors but the
engine now smokes heavily grey'white smoke with a strong diesel knock.it
was ok when the job was first done and only started to smoke after about
10 miles can anyone help thanks.i am a qualified mechanic but at a dead
end with this.HELP.

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T.G. Lambach - 02 Sep 2005 21:26 GMT

Two variables: Valves and injectors.

Smoke is unburnt fuel so you need to determine why its not combusting
completely.

Given ten miles use before the problem began I'd suspect the valve
adjustment. A TURBO engine at 70 degrees F. has its intakes set to .004
INCH and its exhaust to .014 INCH. Though your engine is not a turbo it
will have similar specs.

If you're confident the valve adjustment is OK, I'd move on to the
injectors - one of them is dribbling - stuck open and the smoke is from
fuel burning in the exhaust manifold. That would also explain the knocking.

Hope this helps.

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T.G. Lambach - 02 Sep 2005 21:49 GMT

The "bad" injector can be found by cracking open one high pressure line
at a time (at the IP) while the engine idles - create an intentional
leak so a cylinder doesn't fire. I've had mixed success with this method
but it sure beats removing all the injectors!

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Karl - 03 Sep 2005 02:35 GMT

The 60x engines have hydraulic elements. You do NOT adjust them.

> Two variables: Valves and injectors.
>
[quoted text clipped - 11 lines]
>
> Hope this helps.

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