Fuel - Throttle Body Torque Specifications & Precaution
88chevy31Number: 89-34-6E
Section: 6E
Date: NOV., 1988
Subject: TORQUE SPECS - TBI 700
Model and Year: 1987-89 CAVALIER, BERETTA, CORSICA W/2.0L ENGINE 1987-89 CELEBRITY, M-VAN, S/T TRUCK W/2.5L ENGINE
TO: ALL CHEVROLET DEALERS
Chevrolet Dealer Service Bulletin 87-221 (Section 6E) dated September, 1987, is being cancelled and replaced by this bulletin. This bulletin expands model year applications and reissues specifications regarding repairs to TBI 700 series components. All copies of 87-221 should be discarded.
On vehicles using Model 700 TBI, when reinstalling the TBI unit, tighten the attaching bolts/studs to:
2.0L L4 Pass Car Eng (VIN Code 1)--25.0 N-m (18.0 ft.lbs.)
2.5L L4 Pass Car Eng (VIN Code R)--25.0 N-m (18.0 ft.lbs.)
2.5L L4 Lt. Duty Truck Engine (VIN Code E)--17.0 N-m (13.0 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. It 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 for 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.).