pag. 42
Release 00 - 02/2008
Engine WBE 0701-WBE 0704
Service manual
1. ENGINE BLOCK - External operations
1.8. Replacing the lower compression ring of the
engine shaft (sump side)
NOTE - Before executing this operation di-
scharge all the oil from the bowl and rotate
180° the motor.
1 - Remove the blade (40) and hub (41).
2 - Take out the spline key (42).
3 - Use a thin screwdriver inserted under the sealing
lip to extract the oil seal ring (4).
4 - Make a paper tube (44) around the shaft to
protect the sealing lip and insert the new ring (45)
so that it enters its housing.
5 - Complete the insertion with the help of a pipe
(46) of a diameter of approximately 30-35 mm.
Tightening torques
2
Spark plug tightening torque
16-18 Nm
6
Valve cover fixing screws
8-12 Nm
1 Cylinder head screws
50-55 Nm
24
Flywheel fixing nut
80-90 Nm
2 Screws small plate louver
8-12 Nm
Technical information
Compression
Min. 4 bar
Inlet valve clearance
0,10-0,15 mm
Exhaust valve clearance
0,15-0,20 mm
Minimum inlet valve stem diameter
5,32 mm
Minimum exhaust valve stem diameter
5,27 mm
Min. inlet valve head rim thickness
0,5 mm
Min. exhaust valve head rim thickness
0,5 mm
Valve seat depth
1,8 mm
Minimum valve spring length
28.5 mm
Special equipment
Compression testing tool
21 Valve seat grinding tool
22 Valve grinder
42
4
45
44
46
41
40
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