Product Description

CUMMINS 3918673 OEM TIMING GEAR CASE FRONT COVER GASKET – RAM 5.9L (1994–2002)

Stop front cover oil leaks the right way with a genuine Cummins 3918673 timing gear case front cover gasket. This OEM gear cover gasket restores the factory seal between the timing gear housing and front cover on 1994–2002 Dodge Ram 2500/3500 5.9L Cummins (12V & 24V), helping protect your front main seal, timing components, and accessory drive from oil contamination and dust intrusion.

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Built to Cummins’ exact specifications, the 3918673 gear cover gasket uses OE-quality material and precise cut geometry to maintain proper clamp load and sealing around the entire gear case perimeter. When you’re chasing leaks, doing a timing cover reseal, or upgrading to a new OEM timing cover, this gasket is the correct part number to use for a long-term, leak-free repair.

Key Features

• Genuine Cummins OEM – not a generic aftermarket copy.
• Direct-fit gear case/front cover interface gasket for 1994–2002 5.9L B-Series engines in Ram 2500/3500.
• Designed to withstand high temperature, oil saturation, and vibration in severe-duty use.
• Correct bolt hole and port geometry for fast, hassle-free installation.
• Helps prevent oil leaks, timing cover seepage, and dust intrusion at the front of the engine.
• Backed by Cummins for OEM fit, form, and function.

Fitment – Where This Gasket Is Used

Engine Platform:

• Cummins 5.9L B-Series ISB / 6BT – inline-6 diesel

Primary Vehicle Fitment (On-Highway):

• 1994–2002 Dodge Ram 2500 5.9L Cummins (12-valve & 24-valve)
• 1994–2002 Dodge Ram 3500 5.9L Cummins (12-valve & 24-valve)

Additional Engine Uses (Service / Industrial):

• Cummins 4BT / 6BT B-Series engines using gear cover P/N 3918673 or equivalent gear case pattern.

Always confirm by engine serial number (ESN) when working on non-Ram, industrial, or export applications.

Best Used When

• Front timing cover removal for Killer Dowel Pin (KDP) repair or inspection.
• Replacing a damaged or corroded CUMMINS 3941759 OEM TIMING GEAR COVER 5.9L.
• Major front engine reseal or timing gear service.
• Chasing persistent oil leaks around the timing gear case/front cover joint.

Cross-Reference & Related Cummins OEM Parts

These related Cummins genuine parts are often used when the timing gear case/front cover is opened up:

• CUMMINS 3914385 OEM TIMING COVER GASKET – 5.9L 12V (1989–1993) – front timing cover gasket for earlier 12-valve B-Series engines.
• CUMMINS 3941759 OEM TIMING GEAR COVER – 5.9L (FRONT COVER) – genuine front timing cover; Cummins recommends pairing with 3918673 when replaced.
• CUMMINS 3938157 OEM OIL PICKUP TUBE GASKET – 5.9L (1989–2002) – OE pickup-tube flange gasket, often serviced during major front/low-end reseals.

Cross-reference numbers (for ID only, not direct CPP alternatives):
Cummins 3916401 – related gear cover gasket PN (varies by application); Interstate-McBee M-3918673; PAI 131481; RG-3918673 (Real Gaskets).

Installation Notes

• Thoroughly clean all mating surfaces and remove old gasket material without gouging the aluminum housing.
• Dry-fit the gasket to confirm hole alignment before applying any sealant.
• Follow Cummins service information for bolt torque and tightening sequence.
• Inspect the Killer Dowel Pin (KDP)
• Verify front crank seal condition and replace while the cover is off to avoid re-doing the job.

Specifications for cummins 3918673

FAQ – CUMMINS 3918673 GEAR COVER GASKET

Does CUMMINS 3918673 fit both 12-valve and 24-valve 5.9L Cummins engines?

Yes. This genuine Cummins gear cover gasket is used on 1994–2002 Dodge Ram trucks equipped with the 5.9L B-Series, including late 12-valve (’94–’98) and 24-valve ISB (’98.5–’02) engines, where the engine uses the matching OEM timing gear case and front cover. Always confirm fitment by engine serial number (ESN) if you’re unsure.

Should I use any sealant with this gear cover gasket?

Cummins typically installs this gasket dry on clean, flat mating surfaces, but some applications may call for a light coating of approved sealant at specific corners or joints. Follow the factory service manual or Cummins service information for your exact ESN. Avoid excessive RTV, which can squeeze out and contaminate the oil system.

What else should I replace while I’m in the front cover?

Most techs replace the front crankshaft seal, inspect or correct the Killer Dowel Pin (on 12V engines), and check the timing gear cover itself for damage. Pair this gasket with a new front cover like the CUMMINS 3941759 OEM TIMING GEAR COVER 5.9L when the original cover is warped, pitted, or cracked.

Is this gasket compatible with aftermarket KDP repair kits?

Yes. The 3918673 gasket seals the OEM timing gear case/front cover interface and is compatible with most aftermarket Killer Dowel Pin (KDP) repair kits that retain the factory timing case and cover. The gasket does not interfere with properly installed KDP tabs or repair brackets.

How do I know if this gasket is causing my oil leak?

Common signs of a leaking gear cover gasket include oil seepage around the perimeter of the timing gear cover, oil tracks down the front of the engine block, and residue collecting on the crank pulley and accessories. Once you’ve ruled out the front crank seal and valve cover, a front cover reseal with a new 3918673 gasket is often the permanent fix.