Stihl 064 Service Manual page 75

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