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TM 55-2915-335-30&P
2-13. BYPASS VALVE - REPLACE
2-13
This task covers: Removal and replacement of bypass valve.
INITIAL SETUP
Tools
Material/Parts:
Aircraft Electrician’s Tool Kit,NSN 5180-00-323-4915
Cleaning Cloth, Nonwoven, NSN 8305-00-753-2967
Drill, Hand Electric, 1/4 Inch Size,
Dry Cleaning Solvent, NSN 6850-00-274-5421
NSN 5130-00-889-8994, or equivalent
500 or 600 grit, wet or dry emery paper
Twist Drill, No. 4, NSN 5133-00-189-9249
Tape
Die And Tap Set, NSN 5136-00-357-7504
Disk, Solid, NSN 2040-01-170-6502
Cartridge Pulling Tool, Item 4, Appendix D
Nylon Ball, NSN 2040-01-170-6502
Pulling Tool Adapter, Item 3, Appendix D
Cold Chisel, 1/4 Inch Cut, NSN 5110-00-234-1927
Equipment Condition:
Press Arbor, Hand Operated, 1/2 Ton Pressure,
Canister removed from pump housing PARA 2-11
NSN 3444-00-243-2654, or equivalent
Center Punch, NSN 5120-00-223-1015
Personnel Required:
68F Aircraft Electrician
68D Powertrain Repairer
1. REMOVAL
a.
b.
c.
d.
e.
Plug all open ports in pump housing (l). Clean
rags can be used as packing material. Cover small
openings with tape.
Always use plastic jaws or padding to hold
pump housing in vise. Failure to use soft
jaws may damage the housing.
Secure flange of pump housing in soft-jawed vise.
Support housing by mounting near the bypass
valve port, as shown.
Using a center punch, lightly punch drill starting
point at about center of solid disk (2).
Use a number 4 drill bit and drill through center
of solid disk (2). Gently drill until drill bit just
breaks through disk. Tap hole with 1/4-28 tap.
Install pull tool adapter (Figure 3, Appendix D)
on cartridge pulling tool (Figure 4, Appendix D).
Thread pulling tool (3) into port plug solid disk
(2). Slide hammer of pulling tool against bolt head
to remove disk. Remove and discard port plug
disk. Remove nylon ball from pump housing.
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