Product Description
Genuine Cummins
Cummins 3904217 — Main Bearing Cap Bolt, 14mm (Hex Head Cap Screw)
MPN: 3904217 | Also Known As: main cap bolt, hexagon head cap screw | Spec: M14 x 2.0 x ~119 mm thread/length
Why This Part
- ✓ OE fastener for crankshaft main bearing caps on B-series 5.9L (12-valve).
- ✓ Direct-fit replacement with correct thread pitch and shank length.
- ✓ Restores clamp load for bearing alignment and bottom-end durability.
- ✓ Sold individually; 14 required per engine for a complete set.
OE Fit Engine Bottom-End 14 Per Engine
Quick Specs
| Type | Main bearing cap bolt (hex head cap screw) |
|---|---|
| OE Part # | 3904217 |
| Thread/Length | M14 x 2.0 x ~119 mm |
| Qty Required | 14 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1997 | 5.9L Cummins 12-Valve (6BT) | Ram 2500/3500 |
Industrial/Off-Highway: Common on 4BT/6BT B-Series (verify by ESN before ordering).
Often Paired With
- Main bearing set (standard/oversize as needed)
- Oil pan gasket (replace when resealing)
- Assembly lube & torque wrench for proper preload
What’s In The Box
- (1) Genuine Cummins Main Bearing Cap Bolt (3904217)
- Order quantity 14 for a complete engine set.
Install Tips
- Clean threads and bore; lightly oil threads if specified by service manual.
- Torque in stages and sequence per Cummins procedure; verify bearing clearances.
- Do not mix bolts by position; inspect for stretch or damage during teardown.
FAQ
WILL THIS FIT MY 1989–1997 5.9L 12-VALVE?Yes—this OE main cap bolt fits 1989–1997 Ram 2500/3500 with the 5.9L 12-valve (6BT). Always verify by VIN/ESN on rebuilt or swapped engines.
HOW MANY BOLTS DO I NEED?There are 14 main cap bolts on the 5.9L B-Series. This part is sold individually—order 14 for a complete set.
WHAT ARE THE THREAD AND LENGTH SPECS?M14 x 2.0 thread, approximately 119 mm overall length—correct for the OE application.
ARE THESE TORQUE-TO-YIELD?Follow the Cummins service manual for torque/angle specs. Replace any stretched or damaged bolts; do not exceed factory procedures.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3904217 for proper fit, clamp load, and durability.
Product Videos
Custom Field
Vehicle Year 1989-1997
Vehicle Make DODGE
ENGINE 5.9L CUMMINS
