Monte Carlo V6-260 4.3L DSL (1983)
Piston: All Technical Service Bulletins
Diesel Engine - Service Pistons
Number:
84-105
Section:
6A (VI)
Date:
April, 1984
Subject:
SERVICE PISTONS - 4.3L V6
AND 5.7L V8 DIESEL ENGINES
Model and Year:
1982-84 IMPALA/CAPRICE, MONTE
CARLO, EL CAMINO, CELEBRITY AND 1982-83 MALIBU
TO:
ALL CHEVROLET DEALERS
Service Pistons
The piston pin and retainer have been changed for 1984 model diesel engines. This change utilizes a longer piston pin which is chamfered on each end,
along with a round wire retaining ring. To accommodate the round wire ring, the retainer ring groove in the piston has been changed from a square cut
groove to a rounded groove. It also contains a pry-out notch (see illustration).
Some service pistons now being used incorporate the round wire retainer. Eventually, all service pistons will. Goodwrench engines being produced now
also contain the round wire ring retainer.
Procedures for removing and installing the round wire ring are contained in the 1984 model service manuals. The service pistons used in past model
engines may contain both designs of retaining rings. It is important to remember that the pistons, piston pins, and piston pin retainers MUST NOT be
interchanged. Become familiar with each component. The round wire ring goes with the pin that is chamfered on each end and the piston has a pry-out
notch. The flat snap ring goes with a square end piston pin and the piston does not have a pry-out notch.