Piston Ring Clarification on Cummins 4.5 & 6.7L B Series ...

Piston Ring Clarification on Cummins 4.5 & 6.7L B Series Diesel Engines

The AERA Technical Committee offers the following information regarding piston ring clarification on Cummins 4.5 & 6.7L, B Series diesel engines. Two different intermediate piston ring designs are used in these engines and the specific use depends upon the engine serial number. The type of piston ring can be identified by the type of coating applied to the ring face.

? The chrome faced intermediate piston ring will have a bare metal appearance. ? The phosphate coated intermediate piston ring will have a black appearance.

The piston ring end gap for the two different design intermediate piston rings is unique to its design and varies from each other. Refer to the chart below to determine the specifications to use when checking piston ring end gap for these engines. It should also be noted that the intermediate rings' inside bevel faces down from the top of the piston when correctly installed.

Page 1 of 2 This information is provided from the best available sources. However, AERA does not assume responsibility for data accuracy or consequences of its application. Members and others are not authorized to reproduce or distribute this material in any form, or issue it to their branches, divisions, or subsidiaries, etc. at a different location, without written permission.

? AERA Engine Builders Association. All rights reserved.

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Top Phosphate Coated Intermediate Chrome Faced Intermediate Oil

4.5L and 6.7L Engines Ring Gap

End Gap Specification

Minimum .012" (.300 MM)

Maximum .018" (.460 MM)

.032" (.820 MM)

.047" (1.180 MM)

.021" (.520 MM) .010" (.220 MM)

.034" (.880 MM) .023" (.580 MM)

Page 2 of 2

This information is provided from the best available sources. However, AERA does not assume responsibility for data accuracy or consequences of its application. Members and others are not authorized to reproduce or distribute this material in any form, or issue it to their branches, divisions, or subsidiaries, etc. at a different location, without written permission.

? AERA Engine Builders Association. All rights reserved.

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