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
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