Product Description
CUMMINS 3990732 OEM TAPPET AND PUSHROD SIDE COVER FOR 1989-1998 5.9L 12V CUMMINS
The genuine Cummins 3990732 tappet and pushrod side cover is the factory-correct replacement side cover for 1989-1998 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L 12-valve Cummins engine.
This OEM stamped-steel cover protects the pushrods and lifter valley while helping maintain proper crankcase sealing and reducing oil leaks caused by warped, rusted, or damaged factory covers.
Designed to Cummins OE specifications, the 3990732 side cover delivers proper fitment, durability, and long-term sealing reliability for stock, towing, restoration, and performance applications.
FEATURES
- Genuine OEM Cummins tappet and pushrod side cover
- Stamped steel factory-style construction
- Direct-fit replacement for 5.9L 12-valve engines
- Helps eliminate side cover oil leaks
- Protects pushrods and lifter valley from debris
- Maintains proper crankcase sealing
- Ideal for restoration and rebuild projects
FITMENT
- 1989-1993 Dodge Ram 2500 5.9L 12-valve Cummins
- 1989-1993 Dodge Ram 3500 5.9L 12-valve Cummins
- 1994-1998 Dodge Ram 2500 5.9L 12-valve Cummins
- 1994-1998 Dodge Ram 3500 5.9L 12-valve Cummins
- Select industrial and off-highway 6BT Cummins applications
Fitment Note: This cover is designed for 12-valve B-Series engines only and will not fit 24-valve or common-rail Cummins engines.
WHAT'S INCLUDED
- 1 Cummins 3990732 OEM tappet and pushrod side cover
RELATED PARTS
- Cummins tappet cover gasket
- Cummins tappet cover bolt grommet seals
- Cummins tappet noise panel
- Cummins valve tappets and lifters
CROSS-REFERENCE
- Cummins 3927916
- Cummins 3911821
- Cummins 3910819
- CUM3990732
- PAI 141342
INSTALLATION NOTES
- Clean the sealing surface completely before installation
- Install a new tappet cover gasket and bolt grommets
- Torque hardware evenly to factory specifications
- Inspect for oil leaks after the initial heat cycle
- Verify proper crankcase ventilation operation
SPECIFICATIONS
- Brand: Cummins
- Part Number: 3990732
- Product Type: Tappet and pushrod side cover
- Engine Compatibility: 5.9L 12-valve Cummins 6BT
- Fitment Years: 1989-1998
- Material: Stamped steel
- Application: Side block pushrod and lifter cover
- Quantity Required: 1 per engine
- Approximate Shipping Weight: 6.9 pounds
- Condition: New genuine Cummins OEM part
FAQ
Will this fit my 1989-1998 5.9L 12-valve Cummins Ram?
Yes. Cummins 3990732 is designed for many 1989-1998 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L 12-valve Cummins engine.
Does this include the gasket and bolt grommets?
No. This listing includes the metal side cover only. New gaskets and bolt grommets are recommended during installation.
Will this fit a 24-valve or common-rail Cummins engine?
No. This side cover is designed specifically for 12-valve B-Series applications only.
When should I replace the tappet and pushrod side cover?
Replacement is recommended when the original cover is rusted, warped, leaking oil, or damaged.
Is this a genuine Cummins OEM part?
Yes. This is a genuine Cummins OEM tappet and pushrod side cover.
