TM 55-1905-223-24-8
2-14. Replace Cylinder Block and Head Assembly. (FIGURES 2-5 and 2-6)
This task covers: a. Removal, b. Replacement.
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INITIAL SETUP
Tools
Equipment Condition
Tool kit, general mechanic's,
TM 55-1905-223-10, power OFF,
system drained.
Torque wrench kit
Crankcase oil drained (PMCS
P/N 3377216
Piston compressor
5120-00-116-7676
Materials/Parts
Head assembly P/N 6661X31L
Gaskets P/N 1315, 5827
Lubricating oil, Item 5, Appendix C
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REMOVAL
a. Remove unloader and valve assemblies and tubing (paragraph 2-13).
b. Remove 12 hex head screws (4) and inspection plates (3) from crankcase housing (1). Remove
gaskets (2) and discard.
c. Inside crankcase housing, remove four locknuts (12) and washers (13) from connecting rod assembly
bolts (7).
d. Remove lower connecting rod caps (11) and bearing sleeves (10) from crankshaft (9).
e. Remove eight hex head screws (18) and washers (19) from cylinder block (20).
f. Remove cylinder block and head assembly (20, 23) by lifting up and off of the crankcase housing (1).
g. Remove gasket (21) and discard.
h. Remove upper bearing sleeves (8) from crankshaft (9).
i. Remove seven counterbore screws (16) and washers (17) that secures the cylinder block to the head
assembly.
j. Remove five counterbore screws (14) and washers (15). Separate the cylinder block from the head
assembly.
Change 1
2-21
