International MA1200 Engine >> REVISED TOP COMPRESSION RING

International MA1200 Engine >> REVISED TOP COMPRESSION RING

Revised Top Compression Ring On
Navistar DT-466 Engines


In order to reduce engine emissions and crankcase blow by,
Navistar International has revised the top compression ring on
1990 DT/DTA-466 engines.

The top compression ring is now plasma coated on the face and
directly replaces the former chrome plated ring for all engines,
including those manufactured prior to the 1990 model year.
Intermixing of plasma coated and chrome plated rings in the same
engine is acceptable.

The revised ring can be identified by its foggy/grey appearance
and a white Dykem stripe. The former ring is bright in
appearance and is marked with a blue Dykem stripe. Markings
found on the side of the piston ring must be installed facing up
(see illustration).

The revised ring is only available as part of a piston ring
package which carries Part #1 810 358 C94 replacing Part #1 810
358 C93.


The AERA Technical Committee


July 1991 - TB 790

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