1
16
Fig. 23
11
Choke Control Adjustment
NOTE:
Be sure choke control wire is installed in #2
hole (2) in choke lever,
Fig. 24
.
Fig. 24
1. Place choke control lever on equipment in
CHOKE position.
2. Loosen control casing clamp screw (4).
3. Move control casing and wire (3) until choke is
completely closed (1).
4. Tighten casing clamp screw.
Combustion Chamber Deposits
Combustion chamber deposits should be removed
every
500 hours
or whenever cylinder heads are
removed.
WARNING
•
Wear eye protection whenever using
compressed air to clean parts.
AVOID EYE INJURY!
Remove deposits from combustion chamber and
around valves using a wire brush or scraper. With
piston at Top Dead Center (TDC), remove
combustion chamber deposits from top of piston.
Use care to prevent combustion chamber deposits
from entering push rod or oil return cavity in cylinder.
Take care not to damage cylinder, top of piston,
cylinder head and cylinder head gasket surfaces.
NOTE:
Remove only the combustion chamber de-
posits. It is not necessary to remove the dis-
coloration marks on the piston, valves and
cylinder head. These marks are normal and
will not affect engine operation.
Remove the loose deposits from around the top ring
land area using compressed air or a soft bristle
brush.
Cooling System Cleaning
Grass particles, chaff or dirt can clog the air cooling
system, especially after prolonged service in cutting
dry grass or very dirty air. Operating with a clogged
cooling system can cause overheating and engine
damage. Cleaning the cooling system should be a
regular maintenance operation, performed yearly or
every
100 hours
, whichever comes first.
All Except Models 540000, 610000
Fig. 25
shows the blower housing removed and
areas to be cleaned (1) on the Vanguard
engine.
Fig. 25
