4-15. AUXILIARY POWER UNIT - Continued
4-15 12 Engine Lubrication System
This task covers
Shop Equipment, Automotive
APU Shutdown (see para. 2-12)
APU may be mounted in truck
except where indicated
Remove pipe plug directly above oil filter
Connect 0 - 100 psi (0 - 1000 kPa) gage
to oil pressure port.
Start engine and note oil pressure. Low
idle 20-30 psi (140 - 200 kPa) High Idle
50-65 psi (340 - 450 kPa).
If pressure is low, replace filter, or relief
valve, or oil pump. If pressure is high,
remove and inspect relief valve.
When repair is complete, remove test
gage and install pipe plug.
Engine Oil Filter Repair.
The engine oil fitter can be cleaned
Remove oil filter plug (4).
Extract spring (2) and filter element (1)
Clean, and if necessary replace oil filter.
Slide filter (1) into block followed by
Check seal ring (3) on plug (4). If
Install plug in engine block and tighten