Skyhawk L4-112 1.8L VIN 0 TBI (1982)
Radiator Cooling Fan Temperature Sensor / Switch: All Technical Service Bulletins
Cylinder Head Gasket - Failure
Bulletin 86-6-28
Date
Mar. '87
Ref. No. 86-200-6
Corp. Ref. No. 636104
SUBJECT:
CYLINDER HEAD GASKET REPLACEMENT
MODELS AFFECTED: 1982-86 SKYHAWKS WITH THE 1.8L OHC L4 ENGINE (VIN CODE 0)
Some cylinder head gaskets have been replaced on 1982-86 Skyhawks with 1.8L OHC engines, because of an engine coolant system related condition.
Specifically, some cylinder head gasket failures have been accompanied by failed coolant temperature sensors or coolant fan switches. Either of these
conditions could expose the cylinder head gasket to excessive temperatures and thermal stresses.
The 1.8L OHC turbo cylinder head gasket, Part No. 90200347, has been designed to accommodate higher stress levels and is less susceptible to the type
of failures being encountered, and is recommended as the service replacement for the subject vehicles.
It is recommended that the cooling system temperature sensor and fan switch (Section 8A, Buick Chassis Service Manual) be checked to ensure proper
function.
It is essential that the engine be started and run until the thermostat opens; then retorque all cylinder head/cam carrier bolts an additional 30-50 degrees
in sequence as shown in the Buick Chassis Service Manual, Section 6A.
Use applicable labor operation and labor time.
