Checking The Oil; Changing The Oil - MTD OHV Series Original Operating Instructions

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Checking the oil

Before starting the engine,

always check the oil level.
Ensure that the correct oil level

is always maintained.
See "Checking the oil level".

Changing the oil

Danger!
!
Waste engine oil may cause skin
cancer if it comes into contact with
the skin frequently and for
a prolonged period. Even though
this is unlikely, provided waste oil is
not handled daily, it is advisable to
wash hands as soon as possible
with soap and water after working
with waste oil.
Caution!
Drain the oil while the engine is still
warm but no longer hot (the oil
drains quickly and completely).
Fig. 4
Remove the oil filler cap (1).

Drain the oil into a suitable

container by:
– opening the oil drain plug (2).
or
– tilting the unit on its side
(air filter side face up).
Danger!
!
Before tilting the unit to drain the
oil, run the engine until the petrol
tank is empty.
Screw in the oil drain plug

(if removed) and tighten.
Fill the oil tank with the

recommended oil and check
the oil level.
Re-attach the oil filler cap.

Important
Dispose of waste oil according to
the currently valid regulations for
the protection of the environment. It
is recommended to take the waste
oil in a leakproof container to a
waste oil collection centre. Do not
dispose of with residual waste or
pour onto the ground and leave to
seep away.
8
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 cleaned/
replaced 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.
Fig. 5
Turn air filter cover (1) anti-

clockwise (to the left) and pull out
upwards.
Remove filter element (3).

Carefully check the filter element

for holes and tears and replace if
damaged.
Clean the filter element in

a solution consisting of
a household detergent and warm
water, then rinse thoroughly.
Or wash in a non-flammable
solvent or in a solvent with a high
flash point. Leave the element to
dry for an adequately long
period.
Place the element in clean

engine oil, leave it to absorb the
oil and press out excessive oil.
Important
When the engine is restarted for
the first time, it may give off a little
smoke if there is too much oil left in
the foam element.
Clean air filter cover (1) and

mounting flange (4).
Re-insert filter element and

attach cover:
Press retaining plates (2) of the
air filter cover into the retaining
slots (5) of the mounting flange
and turn all the way clockwise (to
the right).
Ensure that the air filter cover is
positioned correctly!
Operating manual for engine
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.
Fig. 6
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
0.70–0.80 mm (Fig. 7).
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
½ revolution
– used spark plug maximum
⅛ – ¼ revolution.
An incorrectly tightened spark plug
may become very hot and damage
the engine.