This Tech Tip is one of a series we publish for the engine community. It focuses on setting the protrusion of fuel injector tips for Cummins B Series engines. For earlier Dr. Diesel™ Tech Tips on the Cummins B Series engine see
The Cummins B Series engine is a popular engine. It has been widely used in automotive, industrial and marine applications. Cummins B Series as used in automotive applications are found in Dodge trucks as well as some specialized chassis. Cummins B Series as used in industrial applications are found in many wood chippers, Hyster rollers and fork lifts, etc. Most mechanics that work on the Cummins B Series have experience working on the Cummins B Series in Dodge pickups and generalize from that. This can lead to problems.
When installing new or remanufactured Cummins B Series fuel injectors, some people assume that the injector protrusion spec is the same for all applications and just set them for the same spec as used in automotive B Series. This is a common error and can lead to problems because the protrusion is different for the Cummins B series industrial engine.
To help you set the fuel injector protrusion on the Cummins industrial B Series, please take a look below.
Injector Protrusion for the Cummins B Series Industrial Engine
(Note: automotive and marine are different)
|
Min Protrusion
|
Max Protrusion
|
|
|
Inches
|
.1180
|
.1575
|
|
MM
|
3.0
|
4.0
|
If you need to adjust the protrusion on your B Series we have injector seals in different dimensions. However, there is a slight difference between the nominal size of the seal and its actual thickness.
The chart below lists the actual seal thickness for three different B Series Injector Seals.
|
Seal (nominal)
|
MM (actual)
|
Inch (actual)
|
|
1.5 MM
|
1.40 – 1.68
|
.055” – .066”
|
|
2.5 MM
|
2.40 – 2.68
|
.095” – 1.06”
|
|
3.0 MM
|
2.90 – 3.16
|
1.14” – 1.25”
|
We hope that this Tech Tip has been helpful. Foley Engines stocks over 20,000 square feet of engine parts kits for Cummins B Series engines. Please call us at 800.233.6539 or email Dr. Diesel™ at DrDiesel@FoleyEngines.com with any questions to order an engine kit or a Workshop Manual.
Written by Dr. Diesel
Knowledge is power. To help our customers, we share tech tips summarizing some of our opinions, knowledge and information of interest that we have gathered since 1916 when Foley Engines opened for business. If you have any questions or comments, go to “Ask Dr. Diesel™” where you can pose questions about engines, clutches, exhaust scrubbers, etc.
