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Page Title: REPAIR (cont)
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TM 5-4210-220-12 4-15.  AUXILIARY POWER UNIT - Continued (7) Start engine and check for oil leaks (8) Repeat TEST preceding b. Oil Pressure Relief Valve Repair NOTE No repair of parts is possible.  Replace components as required. (1) Remove plug (5). (2) Extract spring (7) and valve body (8). (3) Check valve and housing bore for scours or sticking marks.  Remove any marks with emery cloth (item 13, Appendix E). (4) Measure  valve  diameter.    Should  be  between  0.465  -  0.472  in.  (11.80  -  11.975  mm).    If  less  than  this, replace valve. (5) Measure spring free length.  If less than 1.46 in. (37 mm), replace. (6) Install valve body (8) and spring (7) in engine block. (7) Inspect seal ring (6) on plug (5).  If damaged, replace. (8) Install plug in engine block and tighten. (9) Start engine and check for oil leaks. (10) Repeat TEST preceding. c. Oil Pump Repair NOTE This  can  only  be  carried  out  with engine  removed  from  truck,  and engine    dismounted    from    base. No   repair   of   parts   is   possible. Replace components as required. (1) Remove APU from truck, see para. 4-15.1 REMOVAL. (2) Remove    engine    from    APU    base,    see para. 4-15.1 DISASSEMBLY. (3) Drain oil from engine by removing oil pan plug (2). (4) Remove any burrs from crank, drive end 4-185

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