
12
2
ASSEMBLE AND TIME ROTATING
SYNCHRO-BALANCE
, HORIZONTAL
CRANKSHAFT CAST IRON ENGINES
WARNING
Rapid retraction of starter cord (kick-
back) will pull hand and arm toward
engine faster than you can let go.
Broken bones, fractures, bruises or
sprains could result.
• On some Model Series 326400 engines, the
Synchro-Balance
cover did not have the
balance gear and bearing.
DO NOT ATTEMPT TO START THESE
ENGINES until balance gear and bearing are
reinstalled to prevent kickback when starting.
1. Remove all traces of oil or dirt from tapered
surfaces of drive gears and camshaft before
assembling gears to camshaft.
2. Rotate crankshaft until piston is at top dead center.
3. Remove 5–1/2” (14 mm) cam gear shaft bolt (2).
4. Place magneto end timing gear (6) on cam gear
taper.
5. Install bolt (2) with Belleville washer (1), finger
tight, Fig. 3.
NOTE:On Model Series 300400 and 320400 only,
place PTO-end timing gear on the other
end of camshaft. Install short cam gear bolt
with Belleville washer, finger tight, Fig. 4.
6. To time drive gears, insert short pieces of 1/4” (6
mm) rod (3) through 1/4” (6 mm) holes in drive
gear, and into locating holes in crankshaft bearing
support plates, Fig. 3.
NOTE:For Model Series 300400 and 320400 also
see Fig. 4.
7. With 1/4” (6 mm) rods in place and piston at
exactly TOP DEAD CENTER, torque drive gear
bolt(s) to 200 in. lbs. (23 Nm). Be certain piston
does not move.
8. Remove the 1/4” (6 mm) rods.
9. Install idler gear(s) (5).
10. Install snap-in “E” rings (4) to retain gears. No
further timing is necessary, Fig. 3 and Fig. 4.
The counterweights and ball bearings are an integral
part of the covers and cannot be serviced. Lubricate
ball bearings and gears with a few drops of engine oil.
NOTE: Piston must be at top dead center.
Fig. 3
3
4
5
6
1
2
Fig. 4
5
4
3
1
2
6
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