Over the years Cummins has offered a variety of front gear covers for their B Series engines. These front gear covers are not interchangeable and vary by the fuel injection pump.
Dr. Diesel™ has put together a chart comparing the Cummins B Series front gear covers and the applicable fuel injection pump.
Injection Pump Style |
B Series Front Cover |
Note |
P Style |
One Style |
4 Bolt Front End |
Rotary |
One Style |
3 Bolt (very popular) |
A Style |
3 Different Styles |
4 Bolt Hole Emissions Style |
We hope that this Dr. Diesel™ Tech Tip has been helpful. If you need to swap your Cummins B Series front cover, check out Dr. Diesel™ Tech Tip #234: How to Change the Front Gear on a Cummins B Series Engine for a handy checklist

Written by Dr. Diesel
Knowledge is power. Power to build ties to engine users. To build a relationship with our customers, we share with you our 105 years of knowledge in many ways. We have this special section called “Ask Dr. Diesel™” where you can pose questions about engines, transmissions, industrial hand clutches, exhaust scrubbers, etc.