Interstate-McBee M-3926126 Rear Main Crankshaft Seal w/ Wear Sleeve – 89–18 Cummins 5.9L / 6.7L

Stop rear main leaks the right way. The Interstate-McBee M-3926126 kit includes a rear crankshaft seal and wear (repair) sleeve for a precise, OEM-style fit on 1989–2018 Cummins 5.9L & 6.7L applications. Built from durable materials to meet or exceed factory specs, this aftermarket kit restores sealing on worn crank surfaces and helps prevent repeat leaks.

• Complete solution: Rear main oil seal + wear/repair sleeve for grooved crank surfaces.
• OEM-style fit & performance: Matches Cummins ref. 3926126.
• Durable construction: Materials and dimensions engineered for long service life.
• Aftermarket value: Interstate-McBee quality at a budget-friendly price point.

What’s Included

• (1) Rear crankshaft oil seal
• (1) Wear/repair sleeve

Specifications

Vehicle & Engine Fitment

Always verify with your engine serial number (ESN) for exact compatibility.

• Dodge Ram 2500/3500 – 5.9L/6.7L Cummins
  • 1989–1998 5.9L 12-Valve (6BT)
  • 1998.5–2002 5.9L 24-Valve (ISB)
  • 2003–2007 5.9L Common-Rail (ISB)
  • 2007.5–2018 6.7L Cummins (ISB)
• Additional Cummins platforms (select applications): B/ISB/QSB 5.9, C-Series 8.3L, ISC, ISL, QSC, QSL (verify by ESN).

Install Notes

• Inspect the crank sealing surface. If grooved, install the wear sleeve per instructions.
• Use the correct depth/driver tool; do not cock or over-drive the seal.
• Lightly oil the lip; follow factory torque specs and procedures in the Cummins service manual.

Why Buy From CPP Diesel

• ESN-verified support from real diesel techs
• Fast shipping and easy returns
• Matched parts for the job (seal installers, rear cover gaskets, flywheel bolts)

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