Diesel Systems - Altitude Performance Adjustments: Overview

Bulletin No. I 83-90
File In Group 6E
Number 8
Date May '83
1982-1983 CADILLAC ALTITUDE PERFORMANCE ADJUSTMENTS 5.7L V-8 DIESEL ENGINE

1982-1983 Cadillacs equipped with 5.7L V-8 diesel engines will be manufactured with either high or low altitude diesel systems. A vehicle with a high altitude system will be invoiced with option NA6. The type of system can also be identified by the emission label attached to the fan shroud. The label will indicate that the vehicle was designed for principal use at either high or low altitude.

These adjustments are considered Altitude Performance Adjustments and apply only to in-use vehicles. They should not be used to modify vehicles prior to sale.

Dealers must not sell vehicles with low altitude systems for principal use at high altitude.

SPECIAL TOOLS

All tools or equipment required to perform these adjustments are presented in detail in Cadillac Chassis Service Manuals and include the following:

^ Timing Meter, J-33075
^ Intake Air Crossover Screen, J-26996-2
^ Magnetic Tachometer, J-26925