I have a truck with a Cummins Big Cam 3 that is leaking a fair amount from the rear of the pan as well as both sides about in the middle of the pan. I've tried retorqueing the bolts but that didn't help at all. I bought a new gasket which is thicker and supposed to help with pans that are leaking. I'm wondering if I should try the new gasket or just go ahead and replace the whole pan. Also, does anyone know the tightening sequence for the pan bolts? I've only been able to find one diagram online that shows a tightening sequence but it seems pretty obscure and since it's the only one I've found don't have much confidence in following it.
Leaking Oil Pan - Replace Gasket or Pan?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Ryan.W, Apr 15, 2024.
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If you have an aluminum pan with the rear buttress used from 1948-mid way thru the BC 3 series I highly recommend NOT putting the 6 bolts in it to the clutch housing. The aluminum pans had cracking issues on the rear corners because of these bolts putting pressure on corners by pulling them away from engine block. In early 80’s Cummins sent out a bulletin to completely remove those bolts as a fix. Every old NH pan I’ve seen in a truck with those bolts still there are cracked. My ‘51 Diamond T included.W923 Thanks this. -
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