K 2500 Truck 4WD V8-393 6.5L DSL Turbo (1992)
Flywheel: Customer Interest
Engine - Rattle Noise/No Throttle Response on Start Up
Group Ref.: 6 - Engine
Bulletin No.: 466102
Date: June, 1994
SUBJECT:
SEVERE RATTLE NOISE AND NO THROTTLE RESPONSE ON START-UP (REPLACE FLYWHEEL)
MODELS:
1992-94 CHEVROLET AND GMC TRUCK C/K 2, 3 MODELS WITH 6.5L TURBO-DIESEL (VIN CODE F - RPO L65), AND 5-SPEED MANUAL
TRANSMISSION (RPO MT8)
CONDITION:
Some owners may experience a severe rattle noise along with reduced idle speed and no throttle response while starting their vehicle. This noise has been
described in some cases as sounding like a machine gun. These conditions are more likely to occur on a hot restart with the A/C engaged. The lack of
throttle response may last five or more seconds but ALWAYS accompanies this condition.
Important:
This condition should not be confused with the normal noise heard as the engine is started up or turned off. This noise lasts from 1 to 2 seconds, and
will not interfere with throttle response.
CAUSE:
The dual mass flywheel (DMF) goes into a resonance condition and the damper is unable to provide proper damping.
CORRECTION:
Replace the DMF with the part number listed below.
Important:
These revised parts were installed in production approximately February 1, 1994. The revised parts are identified by the letter M stamped on the
engine side of the flywheel near the outer row of rivets. This letter M is also covered with a dot of white paint.
SERVICE PROCEDURE:
Replace the DMF following procedures as outlined in the appropriate C/K Service Manual, Section 6A6 - Flywheel Replacement.
SERVICE PARTS INFORMATION:
P/N
Description
QTY
15986799
Flywheel A
1
(L65)
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
J1420
Flywheel,
Use Published
Replace
Labor Operation
Time
