A-3906081-AI Sleeve, Wear; Rear Crankshaft SealOne New Aftermarket Replacement Rear Crankshaft Wear Sleeve for Cummins B Series and C Series Diesel Engines This rear crankshaft wear sleeve installs over the crankshaft journal at the rear main seal location, restoring a smooth sealing surface when the original journal is worn or scored. It is used in conjunction with the rear crankshaft oil seal and is a critical component for eliminating rear main oil leaks on Cummins 4B, 4BT, 6B, 6BT, 6C, ISB,
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