SERVICE MANUAL HEADBOLT SPECIFICATIONS

VEHICLES AFFECTED: 1987-89 (ALL MODELS)

This bulletin is being revised to add an additional torque sequence to VIN Codes K and M and to add 1989 model year.

The entries under the heading "Torque Head Bolt To" is the "Torque To" for one complete pass thru the "Torque Sequence," when a second specification is listed, that should be used for a second pass thru the torque sequence listed. After completing the torque sequence(s) then proceed to the entries listed under "Rotate To Angle Of." This is the angle in degrees that each bolt should be rotated following the complete torque sequence. Each entry listed represents one pass thru the sequence.

LITER/ CUBIC BOLT TORQUE ROTATE VIN INCH/ NEW LUBE HEAD TO CODE/ FUEL BOLTS AND/OR BOLT ANGLE TORQUE TYPE SYS. REQ. SEALANT TO OF SEQUENCE ---- ----- ---- ------- -- --- -------- 6 1.6/98 Yes N/A 18 ft lb 60 8 4 1 5 9 L-4 TBI 60 7 3 2 6 10 30

K 2.0/122 Yes N/A 18 ft lb 60 8 4 1 5 9 *L-4 TBI 60 7 3 2 6 10 60

M 2.0/122 Yes N/A 18 ft lb 60 8 4 1 5 9 *L-4 MPFI 60 7 3 2 6 10 60

D 2.3/140 No Engine 35 ft lb 90 7 3 1 6 10 L-4 MPFI Oil 9 5 2 4 8

R,U 2.5/151 No 1-8 Oil 18 ft lb 90 10 6 2 3 9 L-4 TBI 9-10 25 ft lb 8 5 1 4 7 Use On All Sealer Except #9 1052080 Retorque Again To 18 ft.lbs.

9 2.8/173 No Use 66 ft lb No 6 2 3 7 V-6 MPFI Sealer 5 1 4 8 1052080

W 2.8/173 No Use 33 ft lb 90 6 2 3 7 V-6 MPFI Sealer 5 1 4 8 1052080

S 2.8/173 No Use 40 ft lb 90 6 2 3 7 V-6 MPFI Sealer 5 1 4 8 1052080

All Yes 25 ft lb 90 6 1 3 7 3.0L 90 8 4 2 5 3.8L V-6

F 5.0/305 No Use 60/75 No 13 5 2 10 V-8 MPFI Sealer ft lb 17 9 1 6 14 1052080 16 12 8 4 3 7 11 15

E 5.0/305 No Use 60/75 No 13 5 2 10 V-8 MPFI Sealer ft lb 17 9 1 6 14 1052080 16 12 8 4 3 7 11 15

Y 5.0/307 No Dip 90 ft lb No 7 5 1 3 9 V-8 MPFI Bolt Then 8 6 2 4 10 In Oil 130 ft lb

8 5.7/350 No Use 60 to 75 13 5 2 10 V-8 MPFI Sealer ft lb 17 9 1 6 14 1052080 16 12 8 4 3 7 11 15

The illustration shows a typical head bolt pattern and torque sequence.

The position of the numbers listed under "Torque sequence" indicate the approximate position of the head bolts in the cylinder head.

*Complete this procedure after the above sequence has been completed.

Start engine and run until thermostat opens.

Torque all cylinder head/cam carrier bolts an additional 30 degrees to 50 degrees in the proper sequence.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.