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5.4.
It is important to clean and re-oil the air filter
every 10 hrs. of operation, as described in the
Operator's Manual. Failure to do so will cause a
loss of performance, and may allow dirt inges-
tion by the engine.
5.5.
There is a wet-bulb primer in the return line from
the fuel chamber in the carburetor to the fuel
tank. See Figure 5.3.
Return
line
Line to carb.
Figure 5.5
NOTE: All current McCulloch products, including
chainsaws, use the same primer bulb assembly.
5.6.
There are two barbs on the primer bulb assem-
bly. The longer one goes connects to the line
that returns to the tank. The shorter one con-
nects to the fuel chamber in the carburetor.
5.7.
A check valve in the primer bulb assembly
allows the fuel to move in one direction only. If
fuel moves in both directions, replace the primer.
5.8.
The primer clips into a bracket on the air filter
box. Squeeze the tabs together to remove it.
5.9.
The fuel feed line and fuel return line enter the
tank through a black rubber grommet. The
grommet can be easily pried-out or the tank for
access to the fuel filter.
5.10. If it is necessary to remove the fuel tank, the air
filter cover and engine cover must be removed
as described elsewhere in this section.
5.11. The case plug and case plug reinforcement plate
must be removed using a T-25 driver.
See Figure 5.11.
Case plug
reinforcement
plate
Case plug
5.12. The fuel tank is locked into place between a pair
of bosses on the crankcase plug and a pair of
bosses on the engine shroud.
5.13. Rubber insulators fit between the bosses and
the tank, protecting the tank from abrasion.
5.14. Always replace the crankcase plug gasket when
it is removed. Failure to do so may create a
crankcase air leak, causing poor low R.P.M. per-
formance and creating a lean fuel/air mixture.
5.15. Any time that carburetor service is required, the
rest of the fuel system should be inspected as
well. This includes: air filter, fuel filter, fuel lines,
primer bulb, insulator block, insulator block gas-
ket, carburetor gasket.
15
McCulloch 32cc Trimmer
Figure 5.11
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