Inspection. Refer to paragraph 6-3.b for general
Parts with dimensions listed in Table 6-1,
Table of Limits, shall be measured to
ascertain acceptability for repair or
replacement and assembly.
Repair or Replacement. Refer to paragraph 6-
3.c for general repair or replacement instructions.
Replace all gaskets removed during
Do not remove any more material than is
necessary to completely remove the
glaze. Clean the cylinders in
accordance with cleaning procedures.
Remove glaze from cylinder walls with
portable cylinder hone (using 280 to 400
grit stones), a glaze or a crocus cloth,
depending on condition of cylinder walls.
Assembly. To assemble the First Stage piston
and cylinder group, proceed as follows:
A repair kit consisting of lentoid springs
(12), valve ring (13), valve plate (14),
spring plates (15), and cotter pin (11 ) is
available. At overhaul replace these
parts as a set. Assemble Ientoid springs
(12) as illustrated in Figure 6-8.
Assemble spring plates (15), spring tips up on
both, and valve plate (14) so that fixing pin in upper plate
will align these parts. Assemble valve ring (13) and
lentoid springs (12) (see Figure 608).
Apply a very thin coating of sealing compound,
per Military Specification MIL-S-46163 or equivalent, on
mating outer surface between upper and lower valve
plate. Apply between and around mounting holes
making certain no compound will be squeezed into air
Assemble upper plate aligning fixing pin
with holes in plates (15) and valve plate (14). Secure
upper plate with nut and secure nut in position with cotter
pin (11 ).
Apply a light coating of scaling colt)pound, per
Military Specification MIL-S-46163, or equivalent,
between and around mounting holes on top of cylinder.
Make certain that no compound will be squeezed into
cylinder bore area. Assemble cylinder head (5), head
gasket (8), valve assembly (9), and valve gasket (16) to
cylinder (17) using lock washers (7) and screws (6).
The compression rings (3) and oil
control ring (4) are available in a ring kit
and are to be replaced as a set.
Assemble oil control ring (3) and compression
rings (4) in grooves of piston (1). Coat the rings with
clean compressor oil to aid in assembly.
Second Stage Cylinder and Piston Group. (See
Figure 8-15). The following paragraphs contain
disassembly, cleaning, inspection, repair or replacement,
and assembly instructions for the second stage cylinder
and piston group.
Disassembly. Disassemble the second stage
cylinder and piston group only to the extent necessary to
repair or replace a defective part or parts.
Remove the piston and pin assembly (I)
with piston rings (2) from cylinder (17).
Figure 6-8. Lentoid Spring Assembly )Detail