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I bought a 1985 300D from a guy who said he ran it low on oil.

The top of the engine has a tapping noise when the engine is running. The valves and lifters look OK when I had the valve cover off.

I have a spare head and spare injectors but haven't had time to do any further troubleshooting.

It seems it would be hard to run the 300D low on oil because there does not need to be much oil in the crankcase to get picked up by the pump.

Could it be a bad injector? Can you elaborate on sound and how they go bad, etc.?


Thanks