pag. 42
Engine TRE 0701-TRE 0702-TRE 0801
Service manual
10. ENGINE BLOCK – External repairs
10.9. Replacingthelowercompressionringofthe
engine shaft (sump side)
NOTE - Before executing this operation di-
scharge all the oil from the bowl and rotate
180° the motor.
1 - Take out the spline key (49).
2 - Use a thin screwdriver inserted under the sealing
lip to extract the oil seal ring (50).
3 -Make a paper tube (51) around the shaft to
protect the sealing lip and insert the new ring (52)
so that it enters its housing.
4 - Complete the insertion with the help of a pipe
(53) of a diameter of approximately 30-35 mm.
Tightening torques
2 Spark plug tightening torque 18-22 Nm
6 Valve cover xing screws 8-12 Nm
15 Cylinder head screws 50-55 Nm
32 Flywheel xing nut 110-120 Nm
39 Screws small plate louver 8-12 Nm
43 Screws alternator xage 8-12 Nm
Technical information
Compression 4.2 bar
Inlet valve clearance 0.10-0.15 mm
Exhaust valve clearance 0.15-0.20 mm
Minimum inlet valve stem diameter 6.425 mm
Minimum exhaust valve stem
diameter
6.375 mm
Min. inlet valve head rim thickness
(TRE 0701- TRE 0702)
(TRE 0801)
0.5 mm
0.8 mm
Min. exhaust valve head rim thickness
1.0 mm
Valve seat depth 1.5 mm
Minimum valve spring length 37.5 mm
Alternator charge 3.0-4.0 Ω
Special equipment
3 Compression testing tool
29 Valve seat grinding tool
30 Valve grinder
49
50
52
51
53
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