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TM 10-4320-351-14
6.4.12 Assemble Cylinder Head. (Refer to figure 6-36)
This task consists of:
a. Repair
b. Assembly
INITIAL SET-UP:
Tools:
Materials/Parts Required:
Caliper, Vernier
Lapping Compound
(Appendix B, Section III, Item 3)
(Appendix F, Section II, Item 21)
Depth Micrometer
Washer, Copper (Appendix I, Item 33)
(Appendix B, Section III, Item 3)
O-Ring (Appendix I, Item 75)
Key, Socket Head Wrench, 8 mm
(Appendix B, Section III, Item 3)
Equipment Condition:
Valve Grinding Kit
Cylinder head disassembled (para.6.3.20)
(Appendix B, Section III, Item 3)
Valve Spring Compressor
(Appendix B, Section III, Item 3)
Torque Wrench, 50 ft. lb capacity
a.
Using a dial caliper, measure journals, cylinder head and rocker arms for excessive wear in accordance with the
following.
(1)
Measurement A (Cylinder Head Rocker Arm Cavity): 0.355-0.356 in. (9.03-9.06 mm) in width at the
position of the journal hole.
(2)
Measurement B (Rocker Arm Journal Hole): 0.591-0.592 in. (15.03-15.05 mm) in diameter.
(3)
Measurement C (Rocker arm): 0.352-0.354 in. (8.93-8.98 mm) in width at the position of the journal hole.
(4)
Measurement D (Journal): 0.590-0.591 in. (14.99-15.00 mm) in diameter at the narrow end.
b.
Remove carbon deposits from cylinder head (1). Check cylinder head (1) combustion chamber for deformation.
If deformed, smooth out to a maximum depth of 0.010 in. (0.254 mm). If deformation remains after smoothing of
combustion chamber, replace cylinder head (1).
c.
Measure valve stem diameter (a) and valve guide inner diameter (b) for each valve. If the difference between the
two measurements if greater than 0.004 in. (0.10 mm), replace the valve (4 or 6) and the valve guide (5 or 7).
d.
Using a 45 degree seat grinding wheel, carefully polish the hardened surface of valve seat faces (2 and 3) in
cylinder head (1) until an even seating surface is achieved.
e.
Coat valve seat faces (2 and 3) with lapping compound.
f.
Place a new intake valve (4) in valve guide (5) in cylinder head (1). Using a valve lapper, lap intake valve (4) until
a perfect finished surface is achieved on valve seat (2).
g.
Place a new exhaust valve (6) in valve guide (7) in cylinder head (1). Using a valve lapper, lap exhaust valve (5)
until a perfect finished surface is achieved on valve seat (1).
h.
Remove both valves and clean all lapping compound from cylinder head valve seat faces (2 and 3) and valves.
6-57
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