TM 5-4320-300-14
5-18. CYLINDER HEAD AND BLOCK (CONT)
Location/Item
Action
Remarks
WARNING
Make sure that hoists and other lifting equipment are in good repair and of
sufficient capacity to safely handle loads without injury to personnel or
damage to equipment. Securely attach lifting equipment to cylinder head.
Before lifting, be sure load is balanced.
13. Cylinder
Ensure that all seals are in place and wipe mating
head
surface of cylinder head clean. Attach lifting de-
vice to cylinder head and lower head to approxi-
mately 1/2 inch (12.7 mm) above cylinder block.
CAUTION
Engine damage may result if ordinary bolts are used to secure cylinder
head. Cylinder head bolts are specially designed for this purpose.
Compression leaks may result if bolts are torqued beyond recommended
limits, or if they are tightened in one step.
14. Cylinder
Apply a small quantity of
head bolts
MIL-T-22361 thread com-
pound to threads and
underside head of each
bolt. Install bolts hand
tight as head is lowered
onto the block. Torque
all bolts to 15 to 20 ft
lb (20 to 27 N.m). Then
torque bolts to 170 to
180 ft lb (231 to 244 N.m) in 50 ft lb (68 N.m)
increments in the order shown.
NOTE
Repeat tightening sequence at least once, because first bolts tightened in
sequence tend to lose significant clamp load during tightening of
remaining bolts. Apply a steady pressure of 2 or 3 seconds at the
prescribed torque to allow bolts to turn while gaskets yield to their final
designed thickness. Begin on cam follower side of head to take up
tension in push rod springs. Torque bolts to the high side of the torque
specification.
5-75
