Product Description
Genuine Cummins
Cummins 3903834 — Starter Mounting Bolt (12-Point Cap Screw, M10-1.5 × 35mm)
MPN: 3903834 | Also Known As: twelve-point cap screw, starter bolt | Spec: M10-1.5 × 35mm, 12-point head
Why This Part
- ✓ OE hardware that secures the starter to the engine/trans interface.
- ✓ Direct-fit for 1994–2007 Ram 5.9L Cummins (see spacer note below).
- ✓ Hardened, 12-point head for reliable torque and service access.
- ✓ Sold individually; 3 required per engine for a complete set.
OE Fit Hardware 3 Per Engine
Quick Specs
| Type | Starter mounting bolt / twelve-point cap screw |
|---|---|
| OE Part # | 3903834 |
| Thread / Length | M10-1.5 × 35mm |
| Head Style | 12-point |
| Qty Required | 3 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–2007 | 5.9L Cummins (12V, 24V VP44, 24V Common-Rail) | Ram 2500/3500 |
Compatibility Notes: Does not fit trucks with a starter spacer (some dual-disk clutch setups). For industrial 4BT/6BT and other non-automotive uses, verify by ESN before ordering.
Often Paired With
- Starter Motor: OE or quality reman unit (confirm gear reduction & tooth count)
- Companion Bolts: Order 3× 3903834 for a full set
- Thread treatment: Use manufacturer-recommended cleaner/locker and torque to spec
What’s In The Box
- (1) Genuine Cummins Starter Mounting Bolt / 12-Point Cap Screw (3903834)
Install Tips
- Clean threads and mating surfaces; start bolts by hand to avoid cross-threading.
- Tighten evenly and torque to factory spec; recheck after initial heat cycle.
- If a spacer is installed (dual-disk clutches), this bolt may not be correct—verify first.
FAQ
WILL THIS FIT MY 1994–2007 5.9L CUMMINS RAM?Yes—this is the common OE starter bolt for 1994–2007 5.9L Ram 2500/3500. It will not fit applications using a starter spacer (some dual-disk clutches).
HOW MANY BOLTS DO I NEED?Three bolts are required per engine. This listing is sold individually.
WHAT ARE THE THREAD AND LENGTH?M10-1.5 thread, 35mm length, with a 12-point head.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3903834 for proper fit, strength, and durability.
DOES THIS FIT 6.7L TRUCKS?This listing targets 5.9L (1994–2007). 6.7L applications may use different hardware—verify by VIN/ESN.
Product Videos
Custom Field
Vehicle Year 1994-1998
Vehicle Make DODGE
ENGINE 5.9L CUMMINS
