Specifications

6
5
NOTE: SPECIFICATION TABLES BEGIN ON PAGE 11 OF THIS SECTION.
Check and Adjust Tappet Clearance
NOTE:Check valve clearances while engine
is cold.
1. Place valves in their correct guides in cylinder.
2. Turn crankshaft (counterclockwise as viewed from
PTO) until piston comes to top dead center, com-
pression stroke. Both valves should be closed.
3. Check clearance of intake and exhaust valves to
tappets with feeler gauge, Table No. 7, page 13.
4. Turn crankshaft past top dead center until piston is
1/4” (6.4 mm) down from top of cylinder.
5. If there is insufficient clearance, grind ends of
valves square until correct clearance is obtained.
6. If clearance is too great, cut valve seat until correct
clearance is obtained.
7. Narrow the seat, if required, to maintain 3/64 to
1/16” (1.17 to 1.57 mm) seat width.
Install Valves
CAUTION
ALWAYS wear Safety Glasses during valve
spring removal and installation.
Some engines use the same spring for intake and
exhaust side, while others use a heavier spring on the
exhaust side. Compare springs before installing.
NOTE:Apply “LED-PLATE” or Part #93963, Valve
Guide Lubricant, to valve stems and
guides before installing. Be sure that no
“LED-PLATE” or Part #93963 is on the
ends of the valve stems or tappets.
Install Valves, Pin or Collar Retainers
Fig. 9
1. If retainers are held by a pin (2) or collars (3), place
valve spring and retainer (and cup on Model
Series 230000, 240000, 300000 and 320000) into
Tool #19063, Valve Spring Compressor.
2. Compress spring until it is solid.
3. Insert the compressed spring and retainer (and
cup when used) into valve chamber (1).
4. Drop the valve into place, pushing the stem
through the retainer (4).
5. Hold the spring up in the chamber, and the valve
down.
6. Insert the retainer pin with a needle nose pliers or
place the collars in the groove in the valve stem.
7. Lower the spring until the retainer fits around the
pin or collars, then pull out the spring compressor.
8. Be sure pin or collars are in place.
Self-Lock Retainers
Fig. 9, Illus. C
1. If self-lock retainer is used, compress retainer and
spring with Valve Spring Compressor, Tool
#19063, until spring is solid.
2. Large hole of retainer should face toward opening in
Tool #19063, Valve Spring Compressor, Figs. 6, 7.
3. Insert compressed spring and retainer into valve
chamber.
4. Lower valve stem through large hole of retainer
slot and then push down and in on compressor
until retainer bottoms on valve stem shoulder.
5. Release valve spring compressor until it is just free
of spring tension and withdraw compressor.
Fig. 9
AB C
1
1
4
3
2