Section 3. Crankshafts - Tecumseh HH100 Handbook

CRANKPIN WEAR. Crankpins should be examined
for wear, scoring, or out of-round. If any of these
conditions are noted, replace the crankshaft. See
specifications.
Lubricate the crankpin generously before attaching
the connecting rod. This will prevent damage during
the initial run-in after reassembly.
EXAMINE CRANKPIN FOR WEAR OR DAMAGE
REPLACE IF DAMAGED
The vertical VH80 and VH100 (without oil pump) oil
slinger is located on the crankshaft. It is locked in
position between the bearing and the crank gear
and maintains that position due to a slot in the gear
and a stamped bulge in the slinger. This alignment
is necessary to direct the lubricant up into the engine
at a closely engineered angle. Note the pickup trough
and the stiffening rib. View B shows the trough alignment
in correct relation to the crankcase journal. The slinger
should not be incorrectly assembled 180° out of phase.
PLUNGER TYPE PUMP
Some vertical VH100 engines use a plunger-type
oil pump to circulate lubrication. The oil is pumped
up through a hole in the camshaft to a passage allowing
the crankshaft and parts to be lubricated.
36

SECTION 3. CRANKSHAFTS

OIL SPRAY OPENING
PLUNGER
Note the chamfer tooth on the crankshaft gear. This
tooth is used as a reference mark to be matched
with the timing mark on the camshaft.
The crankshaft gear is replaceable. Remove gear
with a conventional puller after the roller bearing
has been removed. The gear and the bearing may
be removed simultaneously, but much difficulty may
be encountered.
Roller bearing must be heated before it is installed.
NOTE: If a damaged gear is replaced, the mating
gear should also be replaced. Example: If the camshaft
is damaged and replaced, the crankshaft gear should
be replaced.
CHAMFER TOOTH
CRANKSHAFT GEAR
CRANKSHAFT GEAR IS PRESS FIT AND
POSITIONED WITH CHAMFERED TOOTH
AWAY FROM COUNTERWEIGHT
CRANKSHAFT GEAR INSTALLATION. Use an arbor
press and suitable driver to press crankshaft gear
into position. Keyway in crankshaft gear is to fit over
gear pin and beveled tooth must face P.T.O. end of
crankshaft. Crankshaft gear must fit tightly against
shoulder.
On engines equipped with Dyna-Static, the
counterweight balance gear is installed between the
crankshaft gear, spacer and the bearing. Keyway
in counterbalance gear is to fit over gear pin and
beveled tooth is in line with keyway.
AGAINST
SHOULDER
REMOVE GEAR
BY PLACING PULLER
JAW UNDER GEAR
USE BEARING
SEPARATOR AND
PULLER TO REMOVE
TAPERED BEARING
PTO TAPERED BEARING
PRESS FIT, HEAT IN OIL
TO INSTALL
REMOVE GEAR BY
PLACING PULLER
JAW UNDER GEAR
CHAMFER
AWAY FROM
COUNTERWEIGHT
SUPPORT CRANKSHAFT
AT COUNTERWEIGHT
WHEN PRESSING ON GEAR