Workshop Manual

COMPILER TECO/ATL
REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION 00
ENDORSED
DATE
10.06.99
35
67 68
Piston
Remove the big-end cap.
Remove the piston connecting-rod assembly.
Piston, demounting and inspection
Remove the circlips and take out the pin, see fig. 77.
Take out the piston rings and clean the slots.
Measure diameter Q at dimension A from the base of the skirt (A = 9
mm).
Replace the piston and piston rings if wear on the diameter exceeds
the minimum given value by more than 0.05 mm.
Note: The forecast allowances are 0.50 and 1.00 mm.
Demounting and remounting the pin stop rings
Remove the circlip by inserting a pointed tool into slot A.
When remounting, insert the circlips with their tips pointing
downwards within the angles (
aa
aa
a = 15°).
Piston, class and logotype
Depending on their diametral values, the pistons are divided into
classes: A, B, C. This reference is marked on the crown of the piston,
see fig. 71.
The logotype is marked inside the piston.
Dimensions (mm)
Piston supply:
Pistons with nominal value diameters are only supplied in class A.
Pistons oversized by 0.50 and 1.00 mm are supplied with a size
reference Ø = 72.5 and Ø = 73 on the crown.
DISASSEMBLY/REASSEMBLY
VIII
69
70
71
Classes
A
B
C
cylinder Ø
71.990 to 72.000
72.000 to 72.010
72.010 to 72.020
piston Ø
71.930 to 71.940
71.940 to 71.950
71.950 to 71.960
play
0.05 to 0.07