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INTERSTATE MCBEE

INTERSTATE-MCBEE M-3903463 ACCESS HOLE COVER 89–98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

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SKU:
MCBM-3903463
MPN:
M-3903463
Shipping:
Calculated at Checkout
$6.85
724-785-4022

Description

Interstate-McBee M-3903463 Access Hole Cover – 89–98 5.9L Cummins 12V

OE-style access hole cover for the Cummins B-Series gear/timing housing access port. Built as an aftermarket replacement to the Cummins 3903463 cover, this Interstate-McBee component seals out dirt and debris and restores proper service access on 1989–1998 Dodge Ram 2500/3500 5.9L 12-valve applications.

  • Direct OEM cross: Replaces Cummins 3903463.
  • Correct fit, reliable seal: Designed for the B-Series gear/timing housing access port.
  • Aftermarket value: OEM-equivalent performance at a lower cost.
  • Service-friendly: Restores convenient access for timing/inspection procedures.

Specifications

Brand Interstate-McBee
Interstate-McBee P/N M-3903463
OEM Cross 3903463 (Cummins)
Location Gear / timing housing access port (front gear cover area)
Seal / O-Ring Use with seal 3903475 (sold separately)
Primary Engine 5.9L Cummins 12-valve (B-Series)

What’s Included

  • (1) Access hole cover (seal 3903475 sold separately)

Vehicle Fitment

Always verify by Engine Serial Number (ESN) for edge cases or mixed components.

  • Dodge Ram 2500/3500 5.9L Cummins (12-Valve): 1989–1998
  • Additional applications: Used across Cummins B-Series families (4B/6B/6C) and select ISC/industrial engines; confirm by ESN.

Installation Notes

  • Clean the housing bore; remove any old seal residue and debris.
  • Install a new seal (3903475) if worn or damaged.
  • Hand-tighten/seat the cover firmly; avoid over-tightening. Follow Cummins service procedures.

Warranty

Interstate-McBee new engine parts typically include up to 24-month coverage from date of installation. For specific terms and exclusions, refer to the manufacturer’s warranty policy.

Cross-Reference & Related

  • OEM Cross: Cummins 3903463 (Access Hole Cover)
  • Related Seal: Cummins 3903475 (Access Cover Seal)
  • Note for 2003–2018 common-rail models: These engines use a different CP3 access cover (e.g., 4935281).

Why Buy From CPP Diesel

  • ESN-verified fitment support from real diesel techs
  • Fast shipping and hassle-free returns
  • Deep Cummins B-Series inventory to complete your repair

FAQ

Will this fit my 1989–1998 12-valve 5.9L Cummins?
Yes. M-3903463 cross-references Cummins 3903463 and is used on 1989–1998 Dodge Ram 5.9L 12-valve applications. Verify by ESN if components were swapped.
Is the seal included?
No. The cover and seal are separate. Use 3903475 as the matching seal/O-ring.
Where does this part install?
It closes the gear/timing housing access port, helping keep contaminants out while preserving service access.
What about 1998.5–2002 or 2003+ trucks?
Late-1998.5–2002 24-valve and 2003+ common-rail engines often use different covers. For 2003–2018 CP3 applications, reference Cummins 4935281.
Any torque spec?
Hand-tighten/seat per Cummins service manual. Do not over-tighten plastic or composite covers.
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