FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
1/01 PAGE 5 - 11
touch the shaft with the drill. Mark the drill with tape so you do not drill through the sprocket
and into the crankshaft face.
The drilled hole will relieve most of the shrink, and a couple of good radial hits with a ham-
mer and chisel will open the sprocket enough so it can be easily removed.
Installation
Encircle the sprocket with wire. Suspend the sprocket from the wire and heat it with a small
propane torch. When it has attained a yellow glow, approximately 400°F (240°C), it can be
slipped over the auxiliary end of the crankshaft. Hold the sprocket in position with high tem-
perature gloves or two pieces of clean wood, rotating it slightly to make sure it is square,
until it has cooled enough to shrink on the crankshaft. DO NOT TOUCH HOT SURFACES
WITHOUT PROPER INSULATION TO PREVENT INJURY
Main Bearings - Removal and Installation
Bearings must be replaced if they show signs of wear or scoring. Wear will be indicated by
the bronze showing through the babbitted surface.
If replacement bearings are needed, the old bearing halves can easily be slid out, new bear-
ings slid in (untabbed end first), and snapped into place. Locate tabs in the notches in the
bearing saddles and bearing caps.
NOTE: CRANK PIN BEARINGS AND MAIN BEARINGS ARE NO LONGER FUNCTION-
ALLY INTERCHANGABLE. CRANK PIN (CONNECTING ROD) BEARINGS
HAVE A NARROWER GROOVE. DO NOT PUT A CRANK PIN BEARING IN A
MAIN BEARING LOCATION.
FIGURE 5-6: CRANKSHAFT - CHAIN SPROCKET
Hit Here with
Chisel and Hammer
To Next Page
Loading...
Need help?
General
