MTD 24640-7 - Manual (Page 8)

E. Clean and reassemble using a hydraulic sealant
on the threads.
ENGINE MAINTENANCE
To obtain long life and trouble-free service from
your engine, certain normal maintenance must be
performed as outlined below:
1. Change oil in crankcase after first two (2) hours
of operation. Then, follow instructions outlined
on page 4.
FIGURE 18
A
CAUTION
Disconnect high tension wire at spark
plug to prevent accidental starting
of engine. Unscrew oil drain plug
located on side at bottom of engine
See figure 18.
NOTE
Always tip engine towards oil drain
hole. Be sure oil drains completely.
Replace oil drain plug and refill with oil as directed
on page 4 or engine nameplate.
2. Check oil every five (5) operating hours or each
time equipment is used.
a.
3. Cleaning engine-This is an aircooled engine
which operates most efficiently when the cooling
fins are clean.
Clean cylinder fins and underside of tank or housing_
thoroughly of all accumulated grass and debris
4. Air Cleaner. (See figure 19).
Paper Type Element. Remove every 10 hours or
oftener if under dusty conditions. Tap to remove
loose dirt and/or blow from inside out with low
pressure air. Replace if torn or perforated or
when plugged to maintain proper carburetor setting
(50 hours). DO NOT WASH IN ANY LIQUID AND
DO NOT OIL.
Paper Element
Element
'Attaching Screw
FIGURE 19
CARBURETOR ADJUSTMENTS (See figure 20)
Do not make unnecessary adjustment. Factory settings
are correct for most application. If adjustments are
needed, proceed as follows:
1. Close power adjusting needle (figure 20) by
turning to right (clockwise). Close finger tight
only. Forcing will cause damage.
2. Open one turn (counterclockwise).
3. Close idle adjusting needle (figure 20) by turning
to right (clockwise). Close finger tight only.
Forcing will cause damage.
4. Open one and one-half (1 1/2) turns (counter­
clockwise).
5. Start engine. Follow starting instructions page 4—
6. With throttle open (carburetor control at RUN
FAST position) adjust power adjusting needle
one-eighth (1/8) turn at a time forward or back­
ward until engine runs smoothly. If engine tends
to stall under load enrich mixture slightly (counter­
clockwise).