Cessna 177 SERIES Service Manual page 239

0F
17. Oil Pressure Line
24. Electrical Connector
18. Adapter (Used without Hourmeter) 25. Transducer (Oil Pressure)
19. Adapter (Used with Ho-rmeter)
26. Nut
20. Firewall
27. Lockwasher
21. Pressure Switch (Hourmeter) 28. Wire (Oil Temperature)
22. Washer
29. Transducer (Oil Temperature)
23. Bolt 30. Engine (Accessory Section)
21
22
3
~20
_
26
19 30
29
~Sfi~;28
292
{7 Detail B 30 Detail C
BEGINNING WITH 17702124
Figure 15-5A. Engine Instrument Installation (Leigh System) (Sheet 2 of 2)
15-42. TROUBLE SHOOTING (Cont).
TROUBLE PROBABLE CAUSE REMEDY
GAGE POINTER GOES OFF Defective gage or sensing
Substitute known-good gage or
HIGH END OF SCALE (cont.) unit.
sensing unit. Replace gage or
sensing unit.
GAGE OPERATES INTER-
Defective master switch, Check circuit wiring. Replace
MITTENTLY. broken or grounded lead. switch, repair or replace
defective wiring.
Defective gage or sensing Substiture known-good gage
unit.
or sensing unit. Replace
gage or sensing unit.
EXCESSIVE POINTER Loose or broken lead. Check circuit wiring. Repair or
OSCILLATION. replace defective wiring.
Defective gage or sensing
Substitute known-good gage or
unit. sensing unit. Replace gage or
sensing unit.
Excessive vibration.
Check mounting screws. Tighten
mounting screws.
Change 5 15-17