Tecumseh HH100 Handbook page 41

METHOD TWO - Cold Bearing. The crankshaft MUST
be supported between the counterweights when pressing
on bearings. Use a driver to direct the pressure of
an arbor press onto the inner race of the bearing
when installing. The bearing must be seated tight
against the shoulder of the crankshaft counterweight
(on magneto end).
This method may require a great amount of
force, therefore, method one should be
considered first.
C/S MUST BE AT ROOM
TEMPERATURE OR
COOLER
INNER RACE
BEARING MUST FIT
TIGHT AGAINST
SHOULDER
SUPPORT C/S AT THIS POINT WHEN PRESSING ON BEARING
BEARING CUP INSPECTION. The bearing cup should
be examined for rust, pitting, scuffing, cracks or other
damage.
The bearing cup is removed by tapping the edge
beneath the oil seal with a light hammer and flat
punch. Press in a new cup until it bottoms on the
shoulder. The bearing cup must be pressed in square,
use an arbor press.
BEARING CUP PRESSED
INTO BOTTOM ON SHOULDER
OIL SEAL
PROCEDURES FOR CYLINDER COVER FIT. Reinstall
cylinder cover using a new gasket and torque to
specifications.
After the cylinder cover is secured to correct torque
specification, place the engine in a stand or device
that will allow the P.T.O. (Power Take-Off) shaft to
extend freely. Turn the crankshaft until the piston
is at T.D.C. Tap the flywheel end of the crankshaft
lightly with a mallet to seat the P.T.O. bearing. With
either fingers or two screw drivers, press the bearing
cup inward until tight.
Position the cylinder cover (magneto end), oil seal,
and sleeve tool over the crankshaft and seat on the
machined gasket surface. Insert a feeler gauge between
the cover and cylinder, record the reading.
BEARING CONE
If there is no space between the cover and the machined
ASSEMBLY
gasket surface to allow insertion of the feeler gauge,
use a .010" (.254 mm) metal spacer. The spacer
fits between the bearing cup and inside surface of
the cover. More than one may be used if required.
Determine the gap between the cover and the machined
surface on the cylinder, which should be from .001''
REMOVE BY - .007'' (.025 mm.- .178 mm), in which case no shim
TAPPING ON
gaskets will be required. However, if the space measures
INSIDE EDGE
over .007: (.178 mm), follow the example below. Use
WITH FLAT
of gaskets must be limited to a combined total of
PUNCH
.010" (.254 mm) thick. Steel spacers must then be
used to eliminate crankshaft end play. (Note: For
VH100 with oil pump, see procedure on next page).
Example:
PLACE SMALL
AMOUNT OF
GREASE ON
INNER EDGE
- .004''
OF SEAL
= .006'' = .152 mm Shim thickness required
+ .006''
NOTE: POSITION COVER AND MAKE MEASUREMENTS
WITHOUT GASKETS OR "O" RING
.010'' .254 mm clearance measured between cover
and cylinder. If clearance is over .010"
(.254 mm), use spacer.
-.102 mm .001'' to .007'' (.025 - .1278 mm)
allowed but use .004" (.102 mm) as
the median.
.152 mm Double above figure for thickness
required to compensate for gasket
compression
.012'' .305 mm total amount of shim gaskets required
(Continued on top next page)
TAP CRANKSHAFT LIGHTLY
TO SEAT IN PTO BEARING
PRESS THE BEARING CUP
IN UNTIL TIGHT
FEELER GAUGE
MEASUREMENT
39