Century Estate Wagon L4-151 2.5L VIN R TBI (1987)
Throttle Body: All Technical Service Bulletins
Fuel Meter Body Attaching Screws - Retightening
Bulletin 87-6C-5
Date Nov. '87
Ref. No. 87-177-6C
Corp. Ref. No. 736522
SUBJECT:
RETIGHTENING FUEL METER BODY ATTACHING SCREWS ON TBI MODEL 700
MODELS AFFECTED: ALL 1987 BUICKS WITH 4-CYLINDER GASOLINE ENGINES (VIN CODES 1, K, R, U)
On vehicles using the Model 700 TBI unit, 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 (See Illustration). Tightening the TBI attaching bolts may cause the fuel meter body gasket to compress and
allow the fuel meter body attaching screws to loosen. Use the specifications below when servicing Model 700 TBI: (Refer to Section 6E [TBI] in service
manual for additional information.)
Tighten TBI Attaching Bolts/Studs to:
2.0L L4 Skyhawk (VIN Code 1) -- 25.0 N-m (18.0 ft. lbs.) 2.0L L4 Skyhawk (VIN Code K) -- 21.5 N-m (16.0 ft. lbs.) 2.5L L4 Century (VIN Code R) -- 2
Tighten Fuel Meter Body Attaching Screws to:
All TBI 700 -- 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.
Proper TBI bolt torque sequence is important:
Manifold attachment bolts/studs first, then fuel meter body screws.
This bulletin is for information only.