Cherokee 2WD L6-242 4.0L VIN M FI (1987)
Cylinder Head Bolts: Technical Service Bulletins
Cylinder Head Bolt - Manual Revision
NOVEMBER 1986 001 126
ALL 1987 CHEROKEE/WAGONEER/COMANCHE VEHICLES WITH 4.0L ENGINES
1E
ENGINES
Attention: Workshop
This I.S. Note Has Been Revised As Indicated By The Revision Bar
SERVICE MANUAL UPDATE-SPECIFICATION ADDITIONS AND/OR CHANGES
The following specification additions and/or changes should be noted in the MOT. 1-6 Component Service Manual, P/N 8980 010 422.
CYLINDER HEAD BOLT TORQUE SPECIFICATION ADDITIONS
There are new cylinder head bolt torque specifications for 1987 Cherokee/Wagoneer/ Comanche vehicles.
The cylinder head bolt (capscrew) torque specifications on page 12 should read:
TORQUE SPECIFICATIONS
Component
Service Set-To Torque
Service Re-Check Torque
Cylinder Head Bolt No. 11
(in torque sequence)
135 N-m (100 ft-lbs)
129-142 N-m (95-105 ft-lbs)
All Other Cylinder Head Bolts
149 N-m (110 ft-lbs)
142-156 N-m (105-115 ft-lbs)
FIGURE 1 - CYLINDER HEAD INSTALLATION
CYLINDER HEAD INSTALLATION
Add a notation to page 57, referring this I.S. Note, giving the following instructions regarding the cylinder head bolt tightening sequence:
NOTE:
Coat the threads of the stud bolt in the No. 11 position with Loctite 592 sealant, or equivalent, before installation.
1.
Tighten all cylinder head bolts to 29 N-m (22 ft.lbs.) torque using the torque sequence.
2.
Tighten all cylinder head bolts to 61 N-m (45 ft.lbs.) torque using the torque sequence.
3.
Recheck all cylinder head bolts at 61 N-m (45 ft.lbs.) torque using the torque sequence.
4.
Tighten all the cylinder head bolts, except No. 11 in the torque sequence, to 149 N-m (110 ft.lbs.) torque using the torque sequence.
5.
Tighten cylinder head bolt No. 11 in the torque sequence to 135 N-m (100 ft.lbs.).
NOTE:
Clean and mark each bolt with a dab of paint after tightening. Should you encounter a set of bolts which were painted during an earlier
servicing operation, replace them.
FILING INFORMATION
Record this I.S. Note on the pages noted in the MOT I-6 and in the following manuals and charts:
Manual
Pages
^
M.R. 244 B-3, B-6, B-19
^
M.R. 277 B-3, B-6, B-19