4-15. AUXILIARY POWER UNIT - Continued
Repair pump as detailed in REPAIR
Install spacer (11) in tappet (12) and slide
over end of injector pump.
Install machine screws (7) and washers
(8) through pump flange.
Install spacer gaskets (10) over machine
Aline pump rack pin with rack slot in block
and install injector pump in block.
Tighten machine screws to 22 ft lb (30
Adjust timing and test pump as detailed
in ADJUSTMENT and TEST preceding.
Injector pump must be removed from
block. See REMOVAL preceding
Measure tappet (12) external diameter. It
must be between 1.1016 -1.1024 in.
(27.98 mm). If less or tappet to guide
clearance exceeds 0.004 in. (0.01 mm)
(2) If original tappet is to be reused, remove
any light marks or grooves with fine
emery cloth (Item 13, Appendix E).
Thickness of spacer must be between
0.138 - 0.142 in. (3.45 - 3.55 mm).
Measure several positions. If error
between measurements is greater than
0.004 in. (0.001 mm), replace spacer.
Any other fault found during testing
cannot be repaired. Replace whole