PeachParts Mercedes-Benz Forum - View Single Post - Curious: What's that OTHER cap on the back of my 240D injection pump?

tcane · #2 01-18-2002, 01:31 AM

The red cap is probably the oil filler cap if you have the M-series injection pump with the pneumatic governor. The M-series injection pump with the pneumatic governor came on some 240D models. My official M-B engine manual says this type of IP needs to be serviced regularly because it has a separate oil supply whereas the other series of IP with a mechanical governor (type M/RSF) is oiled by the engine's oil system and does not need servicing. However, the M-B manual does not specify how to service the M-series IP (typical short-coming). My Haynes manual also does not cover this series of IP. I do recall a thread where a member wrote that this series of IP had a small dipstick to check the oil level - perhaps this is the red cap that you are referring to. You will need to find out what kind of oil needs to be used (weight, service category, etc.), when it should be changed if it needs to be changed, and other related info. Sorry I can't help you more than this. Perhaps another member can provide more info to help you.

Good Luck!
Tom