Product Description
Cummins 3923898 — Genuine Front Timing Gear Cover for 5.9L B-Series
MPN: 3923898 | Also Known As: front timing cover, gear cover, tin front cover, gear housing cover | Cross-Refs (ID only): 3917800, 3917801, 3918675, 4991279
Genuine Cummins stamped steel gear cover that seals the timing gear case on 1994–2002 5.9L Cummins trucks. Built to OE specs for proper fit and alignment of the crank seal and accessories. Cover only—seal & gaskets sold separately.
Features & Benefits
- OE fit & thickness for accurate accessory alignment and long-term sealing.
- Direct-drop replacement for damaged or Dowel Pin–struck (“KDP”) covers on 2nd-gen trucks.
- Corrosion-resistant finish and clean stamped edges for reliable gasket compression.
- Restores factory sealing when paired with new cover gasket and front crank seal.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L 12V (P7100) | Ram 2500/3500 |
| 1998.5–2002 | 5.9L 24V (VP44) | Ram 2500/3500 |
Industrial/Off-Highway: B/ISB/QSB 4B & 6B families (Euro II/BS3 era)—verify by ESN for non-automotive equipment.
Compatibility Notes:
- Designed as the OE front timing/gear cover for 1994–2002 5.9L applications. Earlier 1989–1993 trucks may use different cover P/Ns.
- Does not include front crankshaft seal or cover gasket; add correct parts below.
Specifications
- Type: Front timing gear cover (stamped steel)
- OE Part Number: 3923898
- Cross-References (ID): 3917800, 3917801, 3918675, 4991279
- Quantity Required: 1 per engine (sold individually)
Often Paired With
- Gear cover gasket: 3918673 (cover-to-gearcase)
- Front crank seal (seal only): 3804899
- Front crank seal service kit (with wear sleeve/installer): 3937111
What’s In The Box
- (1) Genuine Cummins Front Timing/Gear Cover (3923898)
- Seals/gaskets sold separately (see “Often Paired With”).
Installation Tips
- Inspect for Killer Dowel Pin (KDP) issues; install a KDP tab while the cover is off.
- Use new 3918673 gasket and a fresh front crank seal; clean surfaces and torque to spec.
- Verify damper runout and seal lip orientation; recheck for leaks after warm-up.
FAQ
WILL THIS FIT MY 1994–2002 5.9L CUMMINS RAM?
Yes—3923898 is the OE front timing/gear cover for 1994–2002 5.9L 12V & 24V applications. Confirm by VIN/ESN.
DOES THE COVER INCLUDE THE FRONT CRANK SEAL?
No—order the seal separately (3804899) or use the service kit (3937111) which includes a wear sleeve/installer.
WHAT GASKET DO I NEED?
Use gear cover gasket 3918673 between the cover and gear housing. Replace if disturbed.
CAN I USE THIS ON INDUSTRIAL 4BT/6BT/ISB?
Often yes, but industrial applications vary—verify by ESN and pump configuration before ordering.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins cover 3923898 for proper fit and durability.
