Injection pump, what am I missing? - Mercedes Forum - Mercedes Benz Enthusiast Forums


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Old 04-12-2017, 02:53 PM
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Default Injection pump, what am I missing?

Hello good people of MercedesForum.com! First post, so please be gentle

My step daughter just received her first car from her dad and it is a 1984 300SD. We are in the process of going over it and making sure it is roadworthy for her. I noticed that there is something missing off of the top of the injection pump, and part of it is tied off. Please help with the missing piece? Here is the pic...





Thank you in advance!
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Old 04-13-2017, 07:19 AM
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Two very important parts are missing, the boost aneroid and transmission vacuum control valve.

Without the aneroid your engine will run poorly, smoke a lot and get bad fuel economy.
Without the VCV your transmission will slam shift between gears and destroy the driveshaft.

With the condition of the pump shown, you'd be best off replacing the entire injection pump with a good used one.
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Old 04-13-2017, 03:51 PM
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Thanks FI!

Other than the obvious eBay and/or CL, do you have a good place to go for MB diesel parts?
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Old 04-13-2017, 11:47 PM
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This place lists as having a 300SD.

An injection pump from any 1981-1984 300SD or 1982-1984 300D/CD/TD will work.
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