Tecumseh HH100 Handbook page 32

8 to 18 hp cast iron four cycle engines
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THIS SYMBOL POINTS OUT IMPORTANT SAFETY
INSTRUCTIONS WHICH IF NOT FOLLOWED
COULD ENDANGER THE PERSONAL SAFETY
AND/OR PROPERTY OF YOURSELF AND
OTHERS.
READ
AND
FOLLOW
ALL
INSTRUCTIONS.
VALVE GUIDE REMOVAL AND INSTALLATION
INSTRUCTION FOR VALVE-IN-HEAD ENGINES.
REMOVING THE OLD VALVE GUIDES
1. Submerge the head in a pan of oil so that both
guides are covered with oil.
2. Heat oil on a hot plate until the oil begins to
smoke. About 15 to 20 minutes. 375° (190°C) -
400° (204°C).
3. When the oil begins to smoke, remove the head
from the pan of oil with a pair of pliers. Drain
excess oil.
4. Place head on the bed of an arbor press on parallels
with the snap rings on the long ends of the guides
facing down.
5. Use a 1/2'’(25.4 mm) diameter, 6'’ (152 mm) drift-
punch and the arbor press to push valve guides
out of the head.
GUIDES
HEAD
OIL
HOT PLATE
HEAT UNTIL OIL BEGINS TO SMOKE.
CAUTION - When locating the drift punch on the
guides be sure to center the punch. DO NOT allow
the punch to make contact with the head when pressing
out the guides.
VALVE GUIDES
1/2” (12.7 mm) FLAT
DRIFT PUNCH
CENTER PUNCH DRIFT ON VALVE GUIDE
INSTALLING NEW GUIDES
NOTE For easy installation, the replacement guides
should be placed in the freezer compartment of a
refrigerator or on ice for no less than 30 minutes
prior to installation.
1. Submerge head with guides removed in a container
of oil so that both guide bores are covered with
oil.
2. Heat oil on a hot plate until the oil begins to
smoke. About 15 to 20 minutes.
3. When the oil begins to smoke, remove the head
from the pan with a pair of pliers. Drain excess
oil.
4. Place head, with gasket surface down, on a piece
of wood, 6 x 12 inches (152 X 304 mm).
5. Remove the new guides from cold storage and
install snap rings used for locating both valve
guides. Insert the guides. It may be necessary
to use a rubber or rawhide mallet to fully seat
the guides to the snap ring depths in the head.
DO NOT use a metal hammer head, or guide
damage will result.
6. Allow head assembly to cool; recut both valve
seats.
Page 30

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Hh120Hh80Oh120-180Vh100Vh80

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