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i just took an 85 d150 with a 318 apart and the number 4 main bearing cap was cracked completely in half but still together like a puzzle piece. it didn't even nock but it lost oil pressure after warm up and the oil got dirty real fast after it was changed. i went to the junkyard today and pulled a number four main bearing cap off of a 1990 d150, everything matched up perfect on the crankshaft and bearing side but the cap was taller which would add strength to the cap where mine broke... idk if it is going to work in mine but i would think that if they changed it in 5 years it would be because that was a common problem.

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15y ago
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Q: Your 85 Dodge 318 looses oil pressure after warm up?
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