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

Product Description

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

Direct-fit access hole cover for the front gear housing (timing cover) on the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Replaces a damaged or missing cover to keep contaminants out of the timing gear train. Sold individually.

• OE-style fit: Matches Cummins reference 3903463 for proper sealing and alignment.
• Protects the gear train: Closes the inspection/service opening on the front cover.
• Service-friendly: Straightforward install with basic hand tools.
• Durable construction: Interstate-McBee quality for long service life.

Specifications

What’s Included

• (1) Access hole cover, P/N M-3903463

Vehicle Fitment

Always verify by engine serial number (ESN) when possible.

• Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
  • Model Years: 1989–1998
• Other B-Series applications where Cummins 3903463 is specified (confirm by ESN).

Installation Notes

• Inspect the sealing surface and replace any gasket/O-ring or sealant as required (not included).
• Clean surfaces thoroughly; avoid over-torquing fasteners.
• Follow the Cummins service manual torque specs and procedures.

Why Buy From CPP Diesel

• ESN-verified fitment support from diesel specialists
• Fast shipping, easy returns, competitive pricing
• Extensive inventory of related B-Series engine parts

FAQ

What does this part do?

It seals the service/inspection opening in the front gear housing (timing cover) to protect the timing gears from dirt and debris.

Does it include the gasket or hardware?

No—this listing is for the cover only. Replace the gasket/O-ring or apply the approved sealant per the service manual.

Will it fit my 1998.5–2002 24-valve?

This listing is intended for 12-valve (1989–1998) applications. Verify by ESN for late-1998 and other variants.