Product Description
Stop 4BT tappet/side cover leaks and add clean crankcase ventilation with the INDUSTRIAL INJECTION PDM-08407 Billet Side (Tappet) Cover. This CNC-billet cover ditches the failure-prone rubber gasket and seals to the block with RTV, and it includes a modern integrated breather and install hardware for a tidy, durable solution on your 3.9L 4BT Cummins.
Fitment
- Engine: Cummins 3.9L 4BT (B-Series)
- Position: Tappet/Side Cover on engine block
What’s Included
- Billet aluminum side (tappet) cover
- Integrated crankcase breather
- Mounting hardware
Why It’s Better
- Billet construction resists warping and long-term seepage
- RTV seal design eliminates the weak factory rubber gasket interface
- Integrated breather improves CCV routing and helps reduce mess
- Clean dress-up look that’s easy to service
Recommended Parts (CPP internal links)
- Shop All 4BT Cummins Parts
- 4BT Engine Parts & Accessories
- CPP LEAK STOP 10AN Oil Catch Can Kit (Cummins) — plumb your CCV for less under-hood oil film.
Helpful Notes
- Use a high-quality RTV sealant and follow proper surface prep for best sealing.
- Route the new breather to a safe location or a catch can to control oil vapor.
- Torque hardware evenly in stages to avoid warping the cover.
Cross-Reference / Alternatives
- See more 4BT side/tappet cover & breather solutions in our 4BT engine parts category.
FAQ
Does this replace the factory rubber gasket?Yes. This billet cover is designed to seal with RTV, eliminating the leak-prone OEM rubber gasket interface on the 4BT side cover.
Is a breather included?Yes, this part includes an integrated CCV breather. We recommend routing it to a catch can for the cleanest results.
Do I need any special tools?No specialty tools are required. Ensure clean sealing surfaces, apply quality RTV per instructions, and torque the fasteners evenly.
Will it fit other B-Series engines?This listing is for the 3.9L 4BT. Some B-Series parts interchange, but verify your application before ordering.
