TM 5-3805-258-24-2
DISASSEMBLY AND ASSEMBLY
ENGINE
HEAD ASSEMBLY
DISASSEMBLE AND ASSEMBLE
start by:
a) remove head assembly
NOTE: Replacement parts are available only
in kits.
REPLACEMENT PARTS
Item
Part No.
Description
1,2
1-11
1.
2.
3.
4.
5.
6.
7.
8.
9.
7C0571
Unloader Kit
7C0569
Major Repair Kit
Remove unloader stop assembly (1) and
discard.
Remove piston assembly (2) and discard.
Use a spanner wrench to remove inlet valve
stop (3).
Remove and discard inlet valve spring (4),
inlet valve (5), valve seat (6), unloader gasket
(7), and unloader spring (8).
Remove discharge valve seat (9) using a
9/16“ Allen wrench.
Remove and discard discharge valve (10) and
spring (11).
Remove all carbon deposits, rust, and scale
from all cavities in the cylinder head. Scrape
head assembly and crankcase mating surfaces
taking care not to allow foreign material to
fall into the cylinder.
Inspect the inlet valve stop (3) for excessive
wear,
nicks, and scratches. If necessary,
“dress”
surfaces with a lapping stone to
remove nicks and scratches.
If inlet valve stop is not salvageable, replace
it with a new part.
5-18b
