TM 10-4930-351-14
0109 00
ASSEMBLE CYLINDER HEAD (Refer to Figure 15)
INITIAL SET-UP:
Tools:
Materials/Parts Required
Caliper, Vernier
Lapping Compound
(WP 0113 00, Item 3)
(WP 0116 00, Item 8)
Depth Micrometer
Petrolatum (WP 0116 00, Item 20)
(WP 0113 00, Item 3)
O-Ring (WP 0117 00, Item 33)
Key, Socket Head Wrench, 8 mm
Washer, Copper (WP 0117 00, Item 59)
(WP 0113 00, Item 3)
Valve Grinding Kit
Equipment Condition:
(WP 0113 00, Item 3)
Cylinder head disassembled
Valve Spring Compressor
(WP 0113 00, Item 3)
Torque Wrench, 50 ft. lb capacity
(WP 0113 00, Item 3)
1.
Using a dial caliper, measure journals, cylinder head and rocker arms for excessive wear in accordance with the
following.
a.
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.
b.
Measurement B (Rocker Arm Journal Hole): 0.591-0.592 in. (15.00-15.05 mm) in diameter.
c.
Measurement C (Rocker arm): 0.352-0.354 in. (8.93-8.98 mm) in width at the position of the journal hole.
d.
Measurement D (Journal): 0.590-0.591 in. (14.99-15.00 mm) in diameter at the narrow end.
2.
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).
3.
Measure valve stem diameter (a) and valve guide inner diameter (b) for each valve. If the difference between the two
measurements is greater than 0.004 in. (0.10 mm), replace the valve (4 or 6) and the valve guide (5 or 7).
4.
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.
5.
Coat valve seat faces (2 and 3) with lapping compound.
6.
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).
7.
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 (3).
8.
Remove both valves and clean all lapping compound from cylinder head valve seat faces (2 and 3) and valves.
9.
Install intake and exhaust valve rings (8).
10. Install intake and exhaust valve guide seals (9).
11. Install intake and exhaust lower valve spring retainers (10).
12. Install intake valve (4) in valve guide (5) and exhaust valve (6) in valve guide (7). Position both valves in cylinder head
(1).
0109 00-19
