Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Harmonic Balancer - Crankshaft Pulley: All Technical Service Bulletins
Engine - Snapping Noise In the Engine Compartment
Bulletin:
92-6-13
Date:
May '92
Ref. No.: 92-216-6
Corp. Ref. No.: 276104
SUBJECT:
SNAPPING NOISE IN THE ENGINE COMPARTMENT NEAR FRONT OF ENGINE (REPLACE CRANKSHAFT PULLEY)
MODELS AFFECTED:
1988-92 SKYLARK WITH QUAD 4 AND QUAD OHC ENGINE
CONDITION:
A snapping noise in the engine compartment near the front of the engine.
CAUSE:
A static electric charge may be built up in the crankshaft pulley outer ring by serpentine belt friction. If the charge builds to a high enough level, it
discharges by arcing to the engine front cover. A snapping sound, similar to a spark plug wire arcing to ground, is created. This static build up is more
likely in low humidity conditions and with a serpentine belt which has been in use. The arcing may not be apparent at all in higher humidity conditions
and is less likely with a new belt.
CORRECTION:
Replace crankshaft pulley with updated grounded outer ring crankshaft pulley. Refer to Parts Information for correct crankshaft pulley part number.
SERVICE INFORMATION:
Verify the crankshaft pulley is discharging to front cover. Discharge can be seen when engine compartment is relatively dark. DO NOT replace
serpentine belt to correct this condition; replacing the belt will only eliminate the condition temporarily.
Refer to Section 6A7 of the service manual for crankshaft pulley replacement procedure.
PARTS INFORMATION:
Vehicles built after February 1992 will have the updated crankshaft pulley. Refer to date on the label on the end of the driver side door.
New Pulley
Part Number
Application
24573015
1988-91 (VIN D)
1992 (VIN 3)
Parts are currently available from GMSPO.
Refer to current Labor Time Guide for labor time allowance.
