TM-9-2815-205-34
ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
AUGUST 1992
TM-9-2815-205-34 - Page 448 of 596
d. Lapping
TM 9-2815-205-34
NOT E
Check valve only requires one lapped side. Turn over to utilize unused side.
New parts do not require lapping prior to use. Following list of used parts may require lapping:
check valve cage (17), bushing (20), valve spring cage (14), and spray tip (2). Lap components
using following procedure:
WARNING
Compressed air used for cleaning purposes will not exceed 30 PSI. Use only
with effective chip guarding and personal protective equipment (goggles/shield,
gloves, etc.)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Clean lapping block set (33) with compressed air. Do not use cloth or other material for this
purpose.
Spread 600 grit dry lapping compound on lapping block (33).
CAUTION
Ensure no lapping compound is accidently placed on the lapped surfaces located
higher up in the spray tip. The slightest lapping action on these surfaces can alter the
near perfect fit between the needle valve and tip.
Place part flat on lapping block (33). Using a figure-eight motion, move part back and forth
across block. Do not press on part. Apply only enough pressure to keep part flat on block.
Keep part flat on block at all times.
After five passes, draw part across clean
piece of tissue placed on flat surface and
clean lapping compound from it.
Inspect part and continue Iapping if
necessary. Do not lap excessively.
WARNING
Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles
and gloves and use in a well-ventilated area. Avoid contact with skin, eyes, and
clothes. Do not breathe vapors. Do not use near open flame or excessive heat.
The flash point is 100-138°F (38-50°C). If you become dizzy while using cleaning
solvent, get fresh air immediately and seek medical aid. If contact with eyes is
made, wash with water and get medical aid immediately.
When part is flat, wash in cleaning solvent and dry with compressed air.
Place part on second block (33). Apply 600 grit lapping compound to block and repeat steps (3)
and (6).
Place part on third block (33). D
O
not apply lapping compound to this block and repeat steps
(3) and (6).
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