Product Description
Genuine Cummins
Cummins 3973853 — Valve Cover Bolt Vibration Isolator / Rubber Seal (Washer)
MPN: 3973853 | Also Known As: vibration isolator, valve cover bolt seal, rubber washer | Sold: Individually (6 required per engine)
Why This Part
- ✓ OE elastomer isolator to damp vibration and maintain clamp load at the valve cover.
- ✓ Direct-fit on late 5.9L and all 6.7L ISB applications (see fitment).
- ✓ Helps reduce seepage & buzz around valve cover bolts.
- ✓ Durable OEM construction—built to Cummins specs.
OE Fit Stock Replacement 6 Per Engine
Quick Specs
| Type | Valve cover bolt vibration isolator / rubber seal |
|---|---|
| OE Part # | 3973853 |
| Qty Required | 6 per engine (sold individually) |
| Location | Under each valve cover bolt head (washer/isolator) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2006–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2024 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: Cummins documentation highlights usage primarily on later 6.7L (EPA13+) applications; late 5.9L usage is common in 2006–2007. Always verify by VIN/ESN before ordering.
Often Paired With
- Valve Cover Gasket w/ Harness (’06–’24): Cummins 5367847
- Oil Cap, Breather & CCV service items as needed
- New valve cover bolts if corroded or damaged
What’s In The Box
- (1) Genuine Cummins Valve Cover Bolt Vibration Isolator / Seal (3973853)
- Sold individually—order quantity 6 for a complete set.
Install Tips
- Clean the bolt head and cover surface; replace gasket if seepage is present.
- Install isolators under each bolt head; torque bolts to factory spec in sequence.
- Recheck for leaks after heat cycle; retorque if required by service manual.
FAQ
HOW MANY ISOLATORS DO I NEED?There are six valve cover bolts—order 6 isolators to service one engine.
WILL THIS FIT MY 2006–2007 5.9L RAM?Yes—commonly used on late 5.9L (’06–’07) applications. Verify by VIN/ESN.
WILL THIS FIT MY 6.7L RAM?Yes—standard for most 6.7L ISB applications from 2007.5–2024 (verify by VIN/ESN).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3973853 for proper sealing and vibration damping.
ARE THESE SOLD INDIVIDUALLY OR AS A SET?Sold individually. Order 6 for a complete engine set.
