Service Manual

CRANKSHAFT AND CAMSHAFT 9-4
NOTE: Radial oil-grooves of the link rods must be
toward the outside of the crankwebs. Install
balance weight to crankshaft with oil hole (7)
facing flywheel side.
Bearing Surface Dia. (MIN)
If bearing surface diameter
is less than MIN,
replace camshaft.
Lobe Height (MIN)
If lobe height is less than MIN for either lobe,
replace camshaft.
CRANKSHAFT AND CAMSHAFT
INSTALLATION
1. Assemble crankshaft, link rods, collares, gear
and balance weight
as illustrated below.
16 17 18 I
7
8
1. Crankshaft
2. Crankcase
3. Oil seal
10. Washer
11. Support shaft
12. Stud
4. Ball bearing
13. Bushing
5. Collar
14. Wrist pin
6. Balance weight 15. Link rod
7. Oi hole
16. Crank gear
8. O-ring
9. Nut
17. Collar
18. Bushing
2. Cover key way on flywheel end of crankshaft
with
a tape to prevent seal damage when
installing crankshaft.
3. Put a light film of oil on crankshaft bearing
surfaces.
4. Pack preferably high temperature grease
into oil
seals.
5. Put crankpin at bottom dead center of engine.
Install crankshaft carefully.
6. Align center hole of balance weight and
support shaft hole in crankcase.
7. Install support shaft, O-ring and nuts.
8. Install con-rod and piston assembly.
9. Install tappets in their respective guides from
(See Section 8)
which they were removed.
NOTE: Push tappets
all the way in to valve guides
to prevent damage to tappets when installing
camshaft.
Install governor shaft and snap pin by properly
positioning
the shaft, pin and projection-stopper
as illustrated.
1. Case cover mounting face
2. Crankcase
3. Snap pin
4. Governor shaft
5. Stopper (projection)
6. Governor shaft in crankcase