Stihl 029, 039 - 10.4 Servicing the Oil Pump

STIHL 029, 039 57
10.4 Servicing the
Oil Pump
- Take out the oil pump mounting
screws.
- Push the oil pump to one side and
ease the elbow connector off the
nipple.
- Remove the oil pump.
- Take the O-ring off the nipple and
fit a new one.
- Place the pump in position and
line it up.
- Slip the assembly sleeve over the
crankshaft stub.
- Fit the mounting screws by hand.
- Place the press sleeve in position.
Tap the end of the press sleeve
lightly to seat the pump housing.
- Tighten screws to 4.0 Nm (3 Ibf.ft).
- Fit the worm.
- Install the clutch - see 3.3.
Always check the suction hose and
pickup body before disassembling the
oil pump.
- Remove the oil pump - see 10.3.
- Swing the elbow connector to one
side and pull it out of the housing.
- Remove the O-ring from the elbow
connector.
- Use a 2 mm (5/64") dia. drift to drive
out the spring pin. Pull the control
bolt out of the housing and remove
the O-rings.
- Take out the pump piston with helical
spring and washers.
- Wash all parts in white spirit. Inspect
the parts for damage and replace as
necessary.
Assembly is a reversal of the
disassembly sequence.
Note: Always install new O-rings. Coat
the pump piston and worm with grease,
- see 12.2, before installing.
1 = Pump piston
2 = Washer
3 = Helical spring
4 = Washer
5 = O-ring
6 = Elbow connector
7 = Spring pin
8 = O-ring
9 = Control bolt
Top:
1 = Assembly sleeve 1122 893 4600
2 = Press sleeve 1127 893 2400
Bottom:
Press sleeve in position
Top:
Removing the oil pump
1 = Elbow connector
Bottom:
O-ring