Hi everyone,

When rebuilding a Cummins 4BT, identifying all the small O-rings and seals in the Lower Gasket Set (P/N 3802375) can be a real challenge, especially when the labels are missing or confusing.

To help the community, I've put together a comprehensive technical breakdown. It includes: ✅ Full English translations for every part number. ✅ Real-product photos for easy visual identification. ✅ Installation tips for the front and rear crankshaft seals.

You can check the full manifest and reference guide here: Cummins 4BT Gasket Kit (3802375) Parts List

Hope this helps with your 3.9L engine projects!

 

Sorry guys, I realized the link in my original post wasn't clickable. Here is the direct link to the Cummins 4BT Gasket Manifest & Technical Guide for those who need it."

 

"Apologies for the broken link earlier. Here is the direct URL for reference: https://yzdlparts.com/cummins-4bt-ga...s-p-n-3802375/"