STIHL 064, 066 75
10.5 Servicing the Oil Pump
Component parts of oil pump (066)
1 = Plug
2 = Pump piston
3 = Washer
4 = Helical spring
5 = Pump housing
Modified carburetor screwdriver 6 = Spring pin
Modified flat nosed pliers 0000 890 2300 7 = 0-ring
a = 5.5 mm
7/32"
b = R 1.5 mm
1 /16"
8 = Control bolt
- Tighten mounting screws to - Hold the projecting end with the Always check the suction hose
3.0 Nm (2.2 Ibf.ft). modified flat nosed pliers. Now and pickup body before disassem-
push home the sleeve with the bling the oil pump.
Installing oil delivery hose (064): modified carburetor screwdriver.
- Remove the oil pump - see 10.4.
- Cut new oil delivery hose to a - Place oil pump in installed po-
length of 74 mm (2.9 in) and coat sition. Use modified carburetor - Use a 2 mm (5/64") dia. drift to
ends with oil. Use modified flat screwdriver to push hose into drive out the spring pin. Pull the
nosed pliers (see illustration) to bar mounting flange so that it control bolt out of the housing
fit the oil delivery hose on the oil is recessed about 1-2 mm and remove the 0-ring.
pump nipple. (3/64" - 5/64").
Note: The original pump has an
- Push the oil delivery hose adjusting screw which must be
through the bore in the bar unscrewed clockwise.
mounting flange (from the inside
outwards) and allow it to project - Pry the plug out of the housing
about 10-20 mm (1/64" - 1/32"). and withdraw the pump piston
If the hose cannot be pushed with helical spring and washers.
through on older machines, drill
out the bore to a diameter of - Wash all parts in white spirit. In
6.2 mm and deburr carefully. spect the parts for damage and
replace as necessary.
Assembly is a reversal of the dis-
assembly sequence.
Note: Always install a new 0-ring.
Coat the pump piston and worm
with grease, see 12.2, before in-
stallin
.
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