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INTERSTATE MCBEE

INTERSTATE-MCBEE M-3937111 FRONT CRANKSHAFT SEAL 89-07 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

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SKU:
MCBM-3937111
MPN:
M-3937111
Shipping:
Calculated at Checkout
$25.55
724-785-4022

Description

Interstate-McBee M-3937111 Front Crankshaft Seal – 1989–2007 5.9L Cummins (Aftermarket)

Replace a leaking front main seal on your 1989–2007 5.9L Cummins with the Interstate-McBee M-3937111. Built to OEM-equivalent specs for reliable sealing, factory-style fit, and long service life—ideal during timing cover/gear case service or whenever oil residue appears at the harmonic balancer.

  • OEM-style fit: Direct replacement for Cummins reference 3937111.
  • Durable materials: Quality elastomer and lip design for consistent sealing.
  • Install-friendly: Works with common installer tools (see tool note below).
  • Aftermarket value: Interstate-McBee quality at a budget-friendly price.

Specifications

Manufacturer Interstate-McBee
Part Number M-3937111
OEM Cross-Ref 3937111 (Cummins)
Position Front Crankshaft (Front Main) Seal
Recommended Installer Tool Cummins 3824498 (or equivalent)

Vehicle Fitment

Always verify by engine serial number (ESN) for edge cases and build dates.

  • Dodge Ram 2500/3500 5.9L Cummins (ISB/6BT)
    • 1989–1998 12-Valve 5.9L
    • 1998.5–2002 24-Valve ISB 5.9L
    • 2003–2007 ISB 5.9L (Common-Rail)
Need 6.7L (2007.5–2018)? The 6.7L typically uses a different seal:
  • Cummins 4931561 – Front crankshaft seal for 6.7L (2007.5–2018).
  • Cummins 4890832 – Front seal kit for ISB/QSB 6.7L (select applications).
  • Cummins 3802820 – Front seal + wear sleeve kit (covers many 1989–2018 applications; confirm by ESN).

Installation Notes

  • Use a proper installer (e.g., 3824498) to avoid lip damage and ensure depth.
  • Inspect crank hub surface; if grooved, install a wear sleeve kit (3802820).
  • Clean mating surfaces thoroughly; follow Cummins service manual procedures and torque values.

What’s Included

  • (1) Front crankshaft oil seal – M-3937111

Why Buy From CPP Diesel

  • ESN-verified fitment support by diesel specialists
  • Fast shipping & easy returns
  • Curated B-series inventory with matching tools and kits

FAQ

Will M-3937111 fit my 2007.5–2018 6.7L Cummins?
Generally, no—6.7L engines typically use a different front seal (4931561) or a front seal kit like 4890832. If you’re servicing a mixed-parts build or using a wear sleeve kit (3802820), verify by ESN before ordering.
Do I need a special tool to install this seal?
Yes. Use an installer such as 3824498 (or equivalent) to set the seal squarely and at the correct depth. Improper installation can cause immediate leaks.
When should I add a wear sleeve?
If the crankshaft sealing surface is grooved or pitted, a wear sleeve is recommended. Cummins kit 3802820 includes a seal and sleeve for many 1989–2018 applications.
Is Interstate-McBee quality comparable to OEM?
Interstate-McBee builds to OEM-equivalent dimensions and materials, delivering dependable sealing performance at a lower price point than OEM-boxed parts.
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Additional Information

YEAR:
1989-2018
MAKE:
DODGE
ENGINE:
5.9L,6.7L
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