Bulletin No. 1.62-2        Group No. 1.62                  December 10, 1998                      Page 1 of 2

 

 

 

PISTON RING COATINGS

 

 

Many suppliers claim to offer high quality cylinder kits and components.  When it comes to ring sets, there are many variables that can have a profound effect on the cost and quality.  The subtle differences in manufacturing processes and high quality materials used in Reliance piston rings offer our customers durability and long engine life regardless of engine application.

 

When selecting a compression ring coating for diesel engines, two of the most popular processes are hard chromium plating and conventional flame–sprayed molybdenum coating.  These familiar wear resistant coatings have been used successfully for some time. 

 

Hard chromium plating may scuff during periods of interrupted or marginal lubrication.  Reliance is careful to only utilize hard chromium plating for ring applications where that process is adequate to provide optimum engine life.

 

Conventional 100% moly coatings are usually sprayed into a channel on the ring peripheral surface.  This method is employed in order to provide conventional moly with a better “grip” on the ring peripheral surface.  This process adds significant cost when compared to other methods of compression ring manufacturing, but offers vastly superior wear resistance for long engine life.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bulletin No. 1.62-2                                                                                                                Page 2 of 2

December 10-1998

 

Shown below is a breakdown of the most popular Reliance ring sets:

 

                                                                                    INTERMEDIATE                 

                                                                                    COMPRESSION                  OIL CONTROL

PART NUMBER                  TOP RING                          RING                                     RING

 

NAR-55759           MOLYBDENUM COATED      DUCTILE IRON                  CHROME PLATED

NRE-48818           MOLYBDENUM COATED      CHROME PLATED           CHROME PLATED

NAR-55630           MOLYBDENUM COATED      MOLYBDENUM                 CHROME PLATED                                                                                  COATED

NAR-51741           MOLYBDENUM COATED      MOLYBDENUM                 CHROME PLATED

                                                                                         COATED

NRE-48380           MOLYBDENUM COATED      MOLYBDENUM                 CHROME PLATED

                                                                                         COATED

NRE-57517           MOLYBDENUM COATED      MOLYBDENUM                 CHROME PLATED

                                                                                         COATED                                   STEEL

 

When overhauling your Deere engine, be sure to use only the highest quality ring sets that include state of the art materials and workmanship.

 

Insist on the best.  Insist on Reliance.