EXPERTEC Technical Service Bulletins (47-63-04)

WARNING: This page is about the C3500 HD 6.5 F, Automatic, which is a different variant/trim than selected.

Publication date: 1995-01-04
Reference number: 47-63-04

EXPERTEC TECHNICAL SERVICE BULLETINS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 47-63-04, Date of Issue: 01/04/1995

BLACK SMOKE AFTER INJECTION PUMP REPLACEMENT

Model(s): 1994-95 Chevrolet and GMC Truck C/K Models with 6.5L Turbo Diesel Engine (VIN S - RPO L56)

Bulletin No.: 47-63-04

Date: January 4, 1995

CONDITION

Some owners may experience excessive black smoke during acceleration immediately after engine or fuel system repair of their vehicle. The previous repairs must have included removal of the intake extension, such as injection pump replacement. If the intake manifold extension has never been removed and there is a comment of black smoke, refer to the symptom section of the driveability, emission, and electrical diagnosis manual.

CAUSE

When reassembling the intake extension to the intake manifold, the EGR tower gasket (see Fig 1 , item 3), P/N 10191428 was either not installed or was not located in its proper position on top of the intake manifold EGR tower. The purpose of the gasket is to seal nonregulated exhaust gasses from the intake system.

CORRECTION

Remove the intake extension, check to see if the gasket is in the proper position on top of the intake manifold EGR tower. If the gasket is not in the proper position or is damaged, install a new gasket. The gasket is round and the metal side faces up when installed properly.

PARTS INFORMATION

Parts are currently available from GMSPO.

Fig 1: EGR Tower Gasket