Servicing The Spark Plug; Cleaning The Engine - MTD OHV Serie Manual Del Usuario

Operating manual for engine
Pour in oil and re-attach filler cap

– see "Changing the oil".
Start engine and leave running

briefly.
Switch off engine and leave to

cool down.
Check oil filter for leaks.

Check oil level and correct if

required – see "Checking the oil
level".
Servicing the air filter
A dirty air filter restricts the air flow
to the carburettor. To prevent the
carburettor from malfunctioning,
the air filter should be serviced
regularly. In an extremely dusty
environment more frequent
maintenance may be required.
!
Danger!
Never clean the air filter with petrol
or solvents with a low flash point.
There is a risk of fire or explosion.
Caution!
Never run the engine without an air
filter. Otherwise the engine may be
damaged or subject to increased
wear.
Note
The paper filter cannot be cleaned.
Fig. 7
Loosen both wing nuts (1) and

remove the air filter cover (2).
Remove the complete air filter (3).

Remove the foam prefilter (4)

from the paper filter (5).
Replace dirty or damaged paper

filter (5).
Clean foam prefilter (4), replace if

damaged.
To clean the foam prefilter,
remove it from the paper filter
and clean with a solution of
household detergent and
warm water. Dry it thoroughly
before reinstalling.
Note
Never wet the foam prefilter with
oil.
Completely assemble air filter and

correctly place the round opening
on the intake nozzle (6).
Attach air filter cover.

Retighten both wing nuts (1)

hand-tight.

Servicing the spark plug

!
Danger!
Leave the engine too cool down.
Conduct an ignition test on a spark
plug which has been removed. Do
not start the engine without
installed spark plug.
To ensure that the engine runs
correctly, the gap between the
electrodes on the spark plug must
be set correctly and free of
contaminants.
Figs. 8 and 9
Remove the spark plug

terminal(1) and unscrew the
spark plug(2) with a spark-plug
wrench.
Visually check the spark plug.

Replace the spark plug if it is
clearly worn or the insulator is
damaged.
Clean the spark plug with a wire

brush if it is to be used again.
Measure the gap between the

electrodes with a feeler gauge. If
required, re-adjust the gap by
slightly bending the side
electrode. The gap between the
electrodes should be 0.60 –
0.80 mm (fig. 9).
Check that the sealing ring on the

spark plug is in good condition,
then screw in the spark plug by
hand to prevent damage to the
thread.
When the spark plug is hand-

tight, tighten with the spark-plug
wrench.
Caution!
Do not tighten the spark plug too
tightly. Observe the following
values for tightening the spark plug
with a spark-plug wrench:
– new spark plug maximum
1/2 revolution
– used spark plug maximum 1/8 –
1/4 revolution.
An incorrectly tightened spark plug
may become very hot and damage
the engine.
Servicing the fuel filter
This maintenance work may only
be performed by a service centre
according to maintenance
schedule.

Cleaning the engine

If the engine has already been
running, leave it to cool down for at
least one hour before cleaning.
Regularly remove accumulated dirt
from the engine. Clean the finger
guard and the area around the
exhaust. Use a brush or
compressed air.
Caution!
Do not clean the engine by
spraying it with water, as the fuel
may be contaminated. Water from
a garden hose or high-pressure
cleaner may penetrate the exhaust
opening and damage the engine.
!
Danger!
Dirt which has accumulated around
the exhaust may catch fire. Check
and clean the area before using the
unit.
English
13