Torque Specifications
Number 86-6(Gasoline)-4 Date 10/85Subject: NEW BOLT TIGHTENING PROCEDURE FOR 2.5L
CYLINDER HEAD.. (ENGINE CODES R-U-2)
1986 GRAND AM, FIERO, 6000 AND FIREBIRD MODELS
Cylinder Head And Gasket Assembly:
A new bolt tightening procedure has been developed for the 2.5L engine which improves head to block clamping force and assures more uniform tightening.
The procedure to be used is as follows:
^ Cylinder head bolts should be washed in solvent and dry at installation. All residual oil should be wiped from the cylinder head mating surfaces.
^ Apply sealing compound pt. # 1052080 to threads of bolts # 9 and # 10.
^ Install all cylinder head bolts and torque to 25 Nm (18 ft. lbs.) in specified sequence. (See Illustration)
^ Repeat the sequence bringing torque to 30 Nm (22 ft. lbs.) on all bolts except # 9. Torque # 9 to 40 Nm (29 ft.lbs.).
^ Repeating the sequence rotate all bolts except # 9, 120 degrees (two flats).
^ # 9 bolt should be rotated 90 degrees (1/4 turn).