Give these guys a call
Blue Ridge Marine 1-800-621-2215. From my understanding they stock parts and do service work on Chrysler/Nissan diesel engines. The M4-33 was used in marine applications. Let me know if that helps.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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