Injection Pump - Black Smoke Only After Replacement
File in Section: 6E - Engine Fuel & EmissionBulletin No.: 47-63-04
Date: January, 1995
Subject:
Black Smoke Only After Injection Pump Replacement (Check Gasket Position/Install New Gasket)
Models:
1994-95 Chevrolet and GMC Truck C/K Models with 6.5L Turbo Diesel Engine (VIN S - RPO L56)
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 (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 non regulated exhaust gasses from the intake system.
CORRECTION
Remove the intake extension, check to see if the gasket (3) (P/N 10191428) 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.