TM 10-4320-344-24
3.8.20 Cylinder Head Assembly Replacement, Models 609-C and US636HCCD-1.
(Continued)
a.
b .
d .
e .
f .
g .
h .
i .
3-96
Install new ring spacer (14) and cylinder head assembly (4) on cylinder (7).
Install four flat washers (6) and cylinder head bolts (5) in cylinder head
assembly (4).
Using straight edge, align inlet and exhaust flanges of cylinder head
assemblies (4).
Preload cylinder head mounting bolts (5) to 30 ft-lbs (40 N•m).
Using angle-of-turn indicator tighten cylinder head bolts (5) in sequence
shown in Figure 3-44 to 450 first, second, and third stage, and 300 fourth
s t a g e .
Install new washers (3) and cover plugs (2).
Torque cover plugs (2) to 59-66
ft-lbs (80-90 N•m).
Using spring compressor tool, assemble and compress spring (11) on pushrod
cover tube (10).
Install retainer (12) with open side towards spring and new washer (13) with
wide end facing toward end of pushrod cover tube (10).
d .
Slowly lift cylinder head assembly (4) from cylinder (7) while keeping pushrod
cover tube assemblies (8) steady; then remove the pushrod cover tube
assemblies (8).
e .
Remove washer (9), pushrod cover tube (10), spring (11), retainer (12), and
washer (13) from each pushrod cover tube assembly (8).
Discard washers (9 and
1 3 ).
f .
Remove and discard ring spacer (14).
3.8.20.2 Adjustment.
a.
Coat a piece of 2 mm resin core solder (15) and place it in position on piston
crown (16) at right-angles to center line of engine, but not on any stenciling
on piston.
Secure in position with grease.
b .
Measure length of each cylinder head bolt (5).
If length exceeds 8.37 inches
(212.50 mm) replace cylinder head bolt (5).
c .
With piston positioned a little before TDC perform following:
(1) Apply grease to and install new ring spacer (14) on cylinder (7).
(2) Install cylinder head assembly (4), four flat washers (6), and cylinder head
b o l t s ( 5 ) c y l i n d e r ( 7 ) .
Hand-tighten cylinder head bolts (5).
d.
Using straight edge, align inlet and exhaust flanges of cylinder head
assemblies (4).
e .
Tighten cylinder head bolts (5) in sequence shown in Figure 3-42 through first
stage 45° angle.
f .
Turn crankshaft through 360° in direction of engine rotation.
g.
Remove cylinder head assembly (4), and measure the thickness of the resin core
solder (15) at its smallest point.
h.
If the thickness is not between 0.039 inches (0.991 mm) and 0.047 inches
(1.194 mm), notify General Support maintenance.
When thickness is correct,
install cylinder head assembly (4).
3.8.20.3 Installation.
