Firenza L4-112 1.8L VIN 0 TBI (1982)
Technical Service Bulletin # 83C7
Date: 840201
Campaign - Timing Belt Inadequately Tensioned
SUBJECT
1.8L OHC L-4 TIMING BELT
NUMBER: 83-C-7
DATE:
Feb.. 15, 1984
MODELS/YEARS
1982-1983 FIRENZA MODELS
SECTION: 6A
Condition, Vehicles, Dealer & Service Information
CONDITION
General Motors has determined that some 1982-1983 Firenza models equipped with 1.8 liter Electronic Fuel Injection/Overhead Cam 4-cylinder engines
may have been produced with a cogged timing belt that was inadequately tensioned at time of assembly. Low tension can allow the timing belt to contact
the front cover with resultant noise and/or failure of the internal timing belt cogs. If several cogs in a row are lost, the engine may not start or run.
To correct this condition, dealers are to replace the timing belt and tension the new belt to a higher specification.
VEHICLES INVOLVED
Involved are ALL 1982 Firenza models equipped with 1.8L EFI/Overhead Cam 4-cylinder engines (Option Code LH8).
Also involved are all 1983 Firenza models equipped with 1.8L EFI/Overhead Cam 4-cylinder engine (Option Code LH8) built WITHIN the following
breakpoints:
BEGINNING
PLANT
V.I.N.
UP TO AND INCLUDING
1983
Leeds
DK300001
DK316828
DEALER ACTION
Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time
forward.
Whenever a vehicle subject to this campaign is taken into your used vehicle inventory, or it is in your dealership for service in the future, you should take
the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required
modification according to instructions contained in this bulletin.
SERVICE PROCEDURE
PART I - BELT TENSION GAUGE
Whenever a timing belt is replaced on the subject engine, it must be adjusted when the engine is hot only (thermostat open).
Tension Specifications
Belt Tension With Engine Hot
150 N (30 LBS.)
The timing belt tension gauge, J-26486-A, was an Essential Tool included originally in the tool package which dealers received approximately March,
1981. This same tool was applied to the new 1.8L OHC L-4 (LH8) engine when it was released. Because of the importance of correct belt tensioning, it
is imperative all dealers have a gage which is accurately calibrated.
PART II - TIMING BELT R & R PROCEDURE
Removal
1.
Loosen generator pivot bolts.
2.
Remove power steering belt (if equipped).
3.
Remove two (2) upper timing cover bolts.