Tighten securely and reconnect wiring harness connector.
3-34. Oil Pump Assembly (fig. 3-12)
Remove all tube assemblies from oil pump assembly and wiring harness connectors from tach-generator
and oil temperature bulb.
Remove three attaching bolts and washers and carefully remove oil pump assembly and packing, with
attached components, from engine in a straight line.
Remove tach-generator as described in paragraph 3-32a.
Cleaning. Clean tach-generator with a clean rag moistened with an approved cleaning solvent.
Install tach-generator on replacement oil pump assembly as described in paragraph 3-32b.
Install replacement oil pump assembly on engine using new packing.
Install oil pump assembly in a straight line and use care to properly engage splines.
Secure oil pump assembly to engine mounting pad with attaching washers and bolts. Tighten bolts to 50 to
70 inch-pound torque.
Reconnect tube assemblies to oil pump assembly using new gaskets. Reconnect wiring harness
connectors to oil temperature bulb and tach-generator.
3-35. Low Oil Pressure Switch (fig. 3-13)
Removal. Remove tube assembly and wiring harness connector from low oil pressure switch. Remove -two
attaching bolts and washers and remove switch from engine.
Cleaning and Inspection
Clean switch with a clean rag moistened with an approved cleaning solvent.
Visually inspect switch fog cracks, damaged threads, or other evidence of damage.
Check continuity across receptacle pins. Circuit across pins A and B should be 3-46 closed; circuit across
pins B and C should be open.
Place switch in a suitable holding device. Slowly apply filtered, regulated compressed air to switch inlet
Check continuity across receptacle pins while applying air pressure. Before 45 psig air pressure is
reached, circuit across pins A and B should open and circuit across pins B and C should close.
Slowly decrease air pressure. At 37 ±
3 psig air pressure, circuit across pins A and B should close; circuit
across pins B and C should open.
Disconnect air supply and remove switch from holding device.
Install satisfactory or replacement switch in place and secure with attaching washers and bolts. Tighten
bolts to 20 to 25 inchpound torque.
Reconnect tube assembly and wiring harness connector to low oil pressure switch.
3-36. Oil Jet (fig. 3-13)
Removal. Disconnect tube assembly from oil jet. Unscrew and remove oil jet and gasket from gear -box
Cleaning and Inspection.
Clean oil jet with an approved cleaning solvent and thoroughly dry with filtered compressed air.
Visually inspect oil jet for corrosion, cracks, abrasion, damaged threads, or other evidence of damage.
Installation. Install satisfactory or replacement oil jet in gear box assembly using new gasket. Tighten securely
and connect tube assembly.
3-37. Oil Scavenge Pump Assembly (fig. 3-13)
Removal. Remove tube assemblies from scavenge pump assembly. Remove four attaching bolts and washers
from pump assembly. Carefully remove pump assembly and packing from gear box assembly in a straight line.
Install, replacement scavenge pump assembly and ,new packing on gear box assembly.