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M18 & M20
SECTION 11
REASSEMBLY
The following sequence is suggested for complete
engine reassembly. This procedure assumes that all
components are new or have been reconditioned, and
all component subassembly work has been com-
pleted. This procedure may have to be varied slightly
to accommodate options or special equipment, Make
sure old RTV sealant has been removed from compo-
nents using this before reassembling.
NOTE:
Make sure the engine is assembled using all
specified torque values, tightening se-
quences, and clearances. Failure to observe
specifications could cause severe engine
wear or damage.
NOTE: Always use new gaskets.
NOTE:
Make sure all components have been cleaned
BEFORE reassembly.
TYPICAL REASSEMBLY SEQUENCE
. Install oil pump and oil pickup.
. Install cross shaft and governor gear.
. Install connecting rods.
. Install bearings and crankshaft.
. Install tappets and camshaft.
. install camshaft bore plug and seal crankcase.
. Install front oil seal.
. Install oil filter adapter.
. Install oil pressure relief valve, closure plate,
and rear oil seal.
10. Install piston rings.
11. Install pistons in cylinder barrels.
12. Install cylinder barrels.
13. Measure valve-to-tappet clearance.
14. Install valves.
15. Install cylinder heads and spark plugs.
16. Install stator.
17. Install electric starter,
18. Install fan, flywheel, and grass screen.
19. Install bracket and ignition module.
SCONAHAYON=A
20.
Install fuel pump.
21. Install valve cover and breather.
22. Install blower housing, cylinder head baffles,
and top baffle.
23. Install solenoid, key switch, rectifier-regulator,
and connect wiring.
24. Install carburetor and intake manifold.
25. Install air cleaner.
26. Install exhaust elbows and mufflers.
27. install oil filter.
INSTALL O!L PUMP AND OIL PICKUP
Oil Pump
1. Install the shim spacer (next to support rib), oil.
pump drive gear (slotted end of gear hub towards
spacer and rib), and oil pump drive shaft (through
support rib and into pump cavity). Refer to
Figures 11-1 and 11-2.
Roll
Pin
d
| Q
Ш
Gear
Spacer
Figure 11-1. Installing Oil Pump Drive Gear.
2. Rotate the drive shaft and drive gear until hole in
shaft is aligned with slot in gear hub.
3. Lubricate a new roil pin with grease. Drive the roll
pin until it is flush with gear hub. Refer to
Figure 11-2.
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