Fuel - Revised TBI Unit Torque Specifications
88pontiac22Bulletin Number: 89-6-14
Reference Number: 736522R
Publish Date: 11/88
Subject: TORQUE SPECIFICATIONS - TBI 700
Models
1987-89 6000, SUNBIRD, AND GRAND AM
Affected: AND 1987-88 FIERO - 2.0L (VIN CODE K) AND 2.5L (VIN CODES R AND U) ENGINES
"This bulletin cancels and replaces bulletin 87-6(Gasoline)-66, dated 9187. This bulletin has been revised to include 1988-89 vehicles and to update specifications."
Service manuals should be changed to include the following revisions.
On vehicles using Model 700 TBI, when reinstalling the TBI unit, tighten the attaching bolts/studs to:
2.0L L4 Engine (VIN Code K) - 22.0 N-m (16.0 ft.lbs.)
2.5L L4 Engine (VIN Codes R and U) - 25.0 N-m (18.0 ft.lbs.)
1987 and 1988 Vehicles:
Any time the TBI attaching bolts/studs to the intake manifold are installed or retightened, the fuel meter body attaching screws should also be retightened. Tightening the TBI attaching bolts may cause the fuel meter body gasket to compress and allow the fuel meter body attaching screws to loosen.
Tighten fuel meter body attaching screws to:
- 6.0 N-m (53 in.lbs.)
If the fuel meter body is removed from the TBI unit, be sure to apply threadlocking compound to the fuel meter body attaching screws. Most GM TBI repair kits include a small vial of threadlocking compound. If this is not available, use Loctite 262 or equivalent. It is not necessary to apply threadlocking compound to the fuel meter body attaching screws if they are being retightened only, and the TBI attaching bolts/studs have already been tightened to the proper torque.
1989 Vehicles:
For the 1989 model year, TBI 700 units will not use lockwashers on the fuel meter body attaching screws. Instead, the screws will be installed with a pre-applied thread locking compound. On these units, it is not necessary to retighten the fuel meter body screws after installing or retightening the TBI attaching bolts/studs.
If the fuel meter body is removed from the TBI unit, be sure to reapply threadlocking compound to the fuel meter body attaching screws. Use threadlocking compound noted above.
Tighten fuel meter body attaching screws to:
- 3.5 N-m (31 in.lbs.)