Product Description
Cummins 3920758 — Timing Gear Case Housing / Gear Housing (Inner)
MPN: 3920758 | Also Known As: gear housing, timing gear case, inner timing housing | Related/Cross-Refs (for ID): 3802350, 3903276
Why This Part
- ✓ OE housing that supports and seals the front timing gear train.
- ✓ Direct-fit for 1989–1993 5.9L 12-valve 6BT (VE rotary pump).
- ✓ Restores proper alignment & oil sealing after damage or leaks.
- ✓ Built to Cummins specs for durability and long service life.
Quick Specs
| Type | Timing gear case housing (inner gear housing) |
|---|---|
| OE Part # | 3920758 |
| Qty Required | 1 per engine (sold individually) |
| Notes | Common on B-Series 4BT/6BT platforms; automotive fitment below |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L 12-Valve 6BT (VE rotary) | Dodge Ram 2500/3500 |
Industrial/Off-Highway: Used widely across B-Series 4BT/6BT engines; verify by ESN.
Often Paired With
- Front Timing Cover (with seal): Cummins 3287076 (1989–1993)
- Gear Housing & Cover Gaskets: Cummins 3914385 (housing-to-cover)
- Front Crankshaft Seal Kit: Cummins 3937111 (service kit)
What’s In The Box
- (1) Genuine Cummins Timing Gear Case Housing (3920758)
- Gaskets/hardware sold separately (see “Often Paired With”).
Install Tips
- Clean mating surfaces thoroughly; use new gaskets and torque to spec.
- Verify gear train alignment and endplay per Cummins service manual.
- Inspect crank seal & timing cover; replace if leaking or damaged.
FAQ
WILL THIS FIT MY 1989–1993 5.9L 12-VALVE RAM?Yes—this is the OE inner timing gear case housing used on 1989–1993 5.9L 12-valve 6BT (VE). Confirm by VIN/ESN if components have been changed.
IS THIS THE INNER HOUSING OR THE FRONT COVER?This is the inner gear housing (timing gear case). The front timing cover is separate (commonly 3287076 for 1989–1993).
WHAT GASKETS DO I NEED?At minimum, the housing-to-cover gasket (e.g., Cummins 3914385) and related seals. Replace the front crank seal if there are any signs of leakage.
DOES THIS FIT 1994–1998 P7100 OR NEWER 24V/COMMON-RAIL ENGINES?No—this listing targets 1989–1993 VE-pump 12V applications. Later engines use different housings.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3920758 for proper fit, alignment, and sealing.
