Assembly
group
6
PISTON, CYLINDER
DISASSEMBLY
6.1.
1
2
3
4
Loosen nuts (1) and remove spring washers (2)
,
cylinder head
(3)
,
and gasket (4)
.
Remove bolt (18)
,
spring washer (17)
,
and air
guide (16), if these parts are mounted.
Loosen cylinder base nuts
(5)
and remove spring washers (6), and
pull off cylinder (7). Discard gasket (8).
Remove circlips
(9).
Push or tap out wrist pin, and remove piston
(11).
Remove thrust washer (12) and needle bearing (13).
NOTE
:
Piston and cylinder ought to be replaced if the max. play between
piston shirt and cylinder wall exceeds
0.35
mm
(see table
of
specs., page 27). All ports on the cylinder wall must be beveled,
if the cylinder is re- machined.
ASSEMBLY
NOTE
:
Clean sealing surfaces of cylinder and crankcase.
6.2.
1
2
8
9
10
1
1
Place new cylinder base gasket (8) on crankcase.
When installing piston (11) the arrow stamped on piston crown must
point towards the exhaust port. (Piston may be installed either
ways if no arrow is shown).
Insert needle bearing (13) in eyelet
of
connecting rod.
Install piston (11) and thrust washers (12) with wrist pin (10)
and secure by circlips (9)
.
Slip a wooden piston support (14) under the piston (11), and
rotate crankshaft until piston rests on support.
Slightly lubricate cylinder liner and piston.
Position piston rings around pegs in ring grooves and compress
rings with ring compressor
(15).
Install cylinder
(7)
and remove
ring compressor (15) and piston support (14).
Torque cylinder (7) with nuts
(5)
and spring washers (6) to
32.4 ft/lbs (44.0 Nm).
Place a new cylinder head gasket (4).
Torque cylinder head
(3)
with nuts (1) and spring washers (2) to
16.2 ft/lbs (22.0 Nm).
Insert air guide (16) with slotted hole to notched pin (19) in
cylinder head (3) and fasten it with bolt (18) and spring washer
(17) on cylinder (7a)
.
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