F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
5 - M
AINTENANCE
PAGE 5-18
during this operation since the shaft could bind and become damaged. Wear
gloves to avoid being cut by the slinger and to achieve a good grip. (As with
each operation, the gloves should be clean to avoid marring of the running sur-
face.)
NOTE: THE LOWER HALF BEARING SHELLS SOMETIMES HAVE A TENDENCY TO
STICK TO THE SHAFT JOURNALS BECAUSE OF THE CLOSE FITTING OILY
SURFACES OF THE TWO PARTS. THEREFORE, WHEN THE SHAFT HAS
BEEN LIFTED CLEAR OF THE SADDLES, APPROXIMATELY 1/4 INCH (6 mm),
CHECK TO MAKE SURE THAT THE LOWER HALF BEARING SHELLS HAVE
NOT COME OUT WITH THE SHAFT. IF SO, THE BEARING SHELLS SHOULD
BE TAPPED BACK ONTO THE SADDLES BEFORE LIFTING THE SHAFT ANY
FURTHER.
Oil Slinger - Removal
Although the slinger should last indefinitely with proper care, it can become nicked. Should it
need replacement, suspend the crankshaft on a sling with the auxiliary end up, and heat the
slinger to 400° F (240°C). It will attain a yellow glow at this temperature. When it has
expanded it should fall off by itself. Do not over heat.
CAUTION!: DO NOT TOUCH HOT SURFACES WITHOUT PROPER INSULATION TO
PREVENT INJURY.
Oil Slinger - Installation
Put the crankshaft in the horizonal position. Put a rod of at least 1/2 inches (13 mm) in diam-
eter through the slinger. (Special care should be exercised when handling the slinger, not
only to keep its surfaces unmarred, but to avoid being cut by the outer sharp edge.) With the
slinger suspended from the rod, heat it with a small torch. When it has attained a yellow
glow, approximately 400°F (240°C), it can be slipped over the drive end of the crankshaft.
Do not over heat the oil slinger. Be sure it is properly oriented before installing. Hold the
slinger in position with high temperature gloves or two pieces of clean wood, rotating it
slightly to make sure it is square and tight against the shoulder, until it has cooled enough to
shrink onto the crankshaft.
CAUTION!: DO NOT TOUCH HOT SURFACES WITHOUT PROPER INSULATION TO
PREVENT INJURY.
Chain Sprocket - Removal
1.
Hit Here with
Chisel & Hammer
F
IGURE
5-14 C
RANKSHAFT
C
HAIN
S
PROCKET
- T
YPICAL
Drill Hole to
Remove a
Worn Sprocket
Examine the sprocket carefully for signs of
wear. If it has been in operation for five
years or more, it may be convenient to
replace it if the crankshaft is removed from
the frame.
2.
Drill a hole in the sprocket hub. This hole
should be parallel to the shaft centerline
and big enough that it removes most of
the hub cross section, see Figure. Be
careful not to touch the shaft with the drill.
Mark the drill with tape so you do not drill
