S15/T15 4WD P/U L4-151 2.5L (1986)
Cylinder Head Bolts: All Technical Service Bulletins
Cylinder Heads - New Bolt Tightening Procedure
NUMBER:
86-B-30
GROUP:
6 - Gasoline Engine
DATE:
February, 1986
SUBJECT:
NEW BOLT TIGHTENING PROCEDURE FOR THE 2.5L CYLINDER HEAD (ENGINE CODE "E")
MODELS:
1985 AND 1986 S/T AND M Models
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 the time of installation. All residual oil should be wiped from the cylinder head mating
surfaces.
NUMBERS SHOWN DESIGNATE BOLT POSITIONS AND BOLT TIGHTENING SEQUENCE
^
Apply sealing compound, P/N 1052080, to threads of bolts No. 9 and No. 10 (See Figure No. 1).
^
Apply a light coat of engine oil to the threads and underside of the bolt heads of bolts No. 1 through No. 8.
^
Install all cylinder head bolts and torque to 25 N-m (18 ft.lbs.) in specified sequence (See Figure No. 1).
^
Repeat the sequence, bringing torque to 30 N-m (22 ft.lbs.) on all bolts except No. 9. Torque No. 9 to 40 N-m (29 ft.lbs.).
