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Are you "growing" engine oil? Had the same prob. Diesel thinning the motor oil.

My 1971 was leaking diesel in to the oil and dripping diesel from the Flame Heater Injection Nozzle on to the turbo. According to the tags, the engine was replaced in 1991 and the fuel injection pump was rebuilt in 1989. Rubber seals can easily harden in 20 years. My FDC was already by-passed...

1971 M35 A2. According to rebuild tag on IP, rebuild date 1989. I was getting about 1 gal of diesel in the oil per 120 miles or so. I pulled the injection pump and replaced the two o-seals on the head (thanks Bottleworks). Next I pulled the booster pump off the IP and took it apart. The...

Oh, guess I am about 2 pages too late with this post and pic! HAHA Oh well

The 1 inch pipe T-thing on top of the valve covers that connects them together. I will try to show a pic here... first time posting a pic.

Check your oil level a minute or so after turning the motor off. If it is to high, then you are going to leak. Mine was leaking diesel from the Injection Pump (refered to as the IP) into the motor oil (a very common problem) and filling the crankcase... when it started to get above a half...