Product Description
Cummins 3918673 — Timing Gear Case Front Cover Gasket (Gear Cover Gasket)
MPN: 3918673 | Also Known As: timing gear case front cover gasket, gear cover gasket | Cross-Ref: 3916401
Why This Part
- ✓ OE gasket that seals between the steel front cover and the timing gear case to stop oil leaks.
- ✓ Direct-fit for 1994–2002 Ram 5.9L Cummins (12-valve & 24-valve).
- ✓ Factory materials & profile for reliable sealing and easy install.
- ✓ Ideal when servicing KDP, front main seal, or front cover work.
Quick Specs
| Type | Front gear cover (timing cover-to-gear case) gasket |
|---|---|
| OE Part # | 3918673 (cross-ref 3916401) |
| Qty Required | 1 per engine (sold individually) |
| Where It Installs | Between steel front cover & timing gear case (not between gear case & block) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–2002 | 5.9L Cummins (12V 1994–1998 & 24V 1998.5–2002) | Ram 2500/3500 |
Industrial/Off-Highway: Used on many 4B/6B 5.9L applications; verify by ESN. Cummins notes primary usage on certain 5.9 B-engine variants.
Often Paired With
- Front Main Seal Kits: 3937111 (service kit) or 3802820 (seal w/ wear sleeve)
- KDP Kit: Industrial Injection 249B01 (Killer Dowel Pin repair)
- Install Tools: 3824498 / 3824500 (front seal installer & wear sleeve installer)
- Brake-clean & surface prep; inspect cover flatness before assembly
What’s In The Box
- (1) Genuine Cummins Timing Gear Case Front Cover Gasket (3918673)
Install Tips
- Clean, dry mating surfaces; follow Cummins sealant call-outs (if specified) per service manual.
- Hand-start bolts, then torque evenly to spec; recheck after heat cycle.
- Great time to inspect/secure the dowel pin (KDP) behind the gear case.
FAQ
WILL THIS FIT MY 1994–2002 5.9L CUMMINS RAM?Yes—designed for 12-valve (’94–’98) and 24-valve (’98.5–’02) 5.9L Ram 2500/3500. Always verify by VIN/ESN.
WHERE DOES THIS GASKET GO?Between the steel front timing cover and the timing gear case—not between the gear case and the block.
DO I NEED SEALANT?Follow the Cummins service procedure. Some areas may require a small dab of RTV at joints; avoid over-applying.
SHOULD I REPLACE THE FRONT MAIN SEAL AT THE SAME TIME?It’s smart to replace the front seal while the cover is off (e.g., kit 3937111 or seal 3802820) and inspect the KDP.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3918673 with factory material and fit.
WILL THIS FIT 2003+ 5.9L COMMON-RAIL TRUCKS?No—2003+ applications use different front cover/gasket designs; order by VIN/ESN for those years.
