Advertisement
M18 & M20
SECTION 9
DISASSEMBLY
A
WARNING:
Accidental Starts!
Before servicing the engine or equipment, always
remove the spark plug leads to prevent the engine
from starting accidentally.
Ground the leads to pre-
vent sparks that could cause fires.
The following sequence is suggested for complete
engine disassembly. This procedure may have to be
varied slightly to accommodate options or special
equipment.
Clean all parts thoroughly as the engine is disassem-
bled. Only clean parts can be accurately inspected
and gauged for wear or damage. There are many
commercially available cleaners that quickly remove
grease, oil, and grime from engine parts. When such a
cleaner is used, follow the manufacturer's instructions
carefully.
Make sure all traces of the cleaner are re-
moved before the engine is reassembled and placed
in operation--even small amounts of these cleaners
quickly break down the lubricating properties of en-
gine oil.
TYPICAL DISASSEMBLY SEQUENCE
. Disconnect spark plug leads.
. Drain oil and remove oil filter.
. Remove mufflers and exhaust elbows.
. Remove air cleaner.
. Remove intake manifold and carburetor.
. Disconnect wiring; remove rectifier-regulator,
key switch, and solenoid.
7. Remove top baffle, cylinder head baffles, and
blower housing.
8. Remove breather and valve cover.
9. Remove fuel pump.
10. Remove ignition module and bracket.
11.
Remove grass screen, flywheel, and fan.
12. Remove electric starter.
13. Remove stator.
олор
ом
14. Identify engine sides.
15. Remove spark plugs and cylinder heads.
16. Remove cylinder barrels,
17. Remove valves.
18. Remove pistons from connecting rods.
19. Remove piston rings.
20. Remove closure plate, oil pressure relief valve,
and rear oil seal.
21. Remove oil filter adapter.
22. Split the crankcase.
23. Remove camshaft and tappets.
24. Remove crankshaft, front oil seal, and bearings.
25. Remove connecting rods.
26. Remove govemor gear and cross shaft.
27. Remove oil pickup and oil pump.
DISCONNECT SPARK PLUG LEADS
DRAIN OIL AND REMOVE OIL FILTER
1. Remove the oil fill cap, dipstick, and oil drain
plug. Drain the oil from crankcase.
Refer to
Figure 9-1.
2. Remove and discard the oil filter.
Oil Fill
>
Exhaust
Cap
Pipe
Muttler
Spark Plug
t
Spark Plug
Lead
T
Lead
Dipstick
Oil Filter
Oil Drain
Plugs
=
Figure 9-1.
Removing Spark Plug Leads, Oil Drain,
Oil Filter, and Mufflers.
9.1
Advertisement
