Product Description
The CUMMINS 3918999 OEM HARMONIC BALANCER is the factory-engineered vibration damper designed to protect your 5.9L ISB (1998.5–2002) from destructive crankshaft harmonics. When a harmonic balancer begins to fail, you can experience excessive engine vibration, accessory belt issues, premature bearing wear, and even crankshaft damage. Installing this genuine Cummins vibration damper restores smooth rotation and maintains engine longevity exactly as Cummins intended.
This balancer is manufactured to Cummins OEM standards with correct durometer rubber, precision-balanced construction, and OE timing marks. It is the only damper proven to reliably withstand diesel vibration, towing loads, and performance tuning. Do not risk your engine with low-quality aftermarket balancers — choose genuine Cummins.
Key Features & Benefits
- Genuine Cummins 3918999 harmonic balancer – NOT aftermarket.
- Restores proper crankshaft harmonic control and reduces vibration.
- Prevents premature bearing wear and crankshaft fatigue.
- Essential for stock trucks, towing rigs, and tuned engines.
- OE timing marks for perfect alignment and installation.
Fitment
This OEM Cummins harmonic balancer fits:
- 1998.5–2002 Dodge Ram 2500 5.9L ISB (24-valve)
- 1998.5–2002 Dodge Ram 3500 5.9L ISB (24-valve)
Engine Family: 5.9L ISB (24V)
Position: Front of crankshaft
Always confirm using your VIN or engine serial number (ESN).
Recommended Genuine Cummins Parts
These related Cummins parts are often replaced at the same time:
- CUMMINS 3946495 OEM HARMONIC BALANCER DOWEL PIN – 5.9L/6.7L
- CUMMINS 3804899 OEM FRONT CRANKSHAFT SEAL – 5.9L/6.7L
- CUMMINS 3937111 FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L
Installation Notes
- Check crank snout for wear or corrosion before installation.
- Use the correct Cummins-specified torque procedure.
- Inspect accessory belt and tensioner while servicing the balancer.
- Replace balancer bolts if damaged or stretched.
Specifications for cummins 3918999
| Specification | Detail |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3918999 |
| Engine Compatibility | 1998.5–2002 5.9L ISB Cummins (24-valve) |
| GTIN | Not published by Cummins |
| UPC | Not published by Cummins |
| Cross Reference | Cummins 3918999; Mopar 5086860AA (dealer reference) |
| E-Codes / Emissions | OE emissions-compliant part |
| Shipping Weight | Approx. 9 lb |
| Shipping Dimensions | 9 in × 9 in × 3 in |
| Shipping Method | Standard ground |
| Prop 65 Warning | This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov |
FAQ
WILL THIS CUMMINS 3918999 BALANCER FIT MY 24-VALVE 5.9L?
Yes, this is the correct OEM harmonic balancer for 1998.5–2002 5.9L ISB 24-valve Dodge Ram 2500/3500 trucks. For absolute accuracy, confirm using your ESN.
WHAT ARE THE SYMPTOMS OF A FAILING HARMONIC BALANCER?
Excessive vibration, belt misalignment, squealing, looseness in the rubber isolator, or visible wobble at idle. A failed balancer can destroy bearings and even damage the crankshaft.
IS THIS A GENUINE CUMMINS BALANCER OR AFTERMARKET?
This is a genuine Cummins OEM 3918999 vibration damper, not a reproduction or offshore alternative. It meets all OE durability and balance specifications.
SHOULD I REPLACE THE FRONT CRANK SEAL AT THE SAME TIME?
Yes — this is the perfect opportunity. Many technicians replace the balancer along with a new seal such as the Cummins 3804899 front crank seal or the Cummins 3937111 seal service kit .
