21
COMPILER TECO/ATI ENDORSEDDATE
01.08.2003
REG. CODE
1-5302-620
MODEL N°
50902
DATE OF ISSUE
08-03
REVISION 00
X
17
18
19
0,30 ÷ 0,50
0,25 ÷ 0,50
0,80
0,80
A = 0,22
B -C= 0,18
D = 0,16
0,001 ÷ 0,010 0,060
RD210 RD 211
RD270 RD278
89,919 ÷ 89,930
94,920 ÷ 94,935
CHECKS AND OVERHAUL
Piston rings - Pistons - Piston pins
Check the wear of piston rings by fitting them into the cylinder
through the lower end and measuring the end gap (fig.17). The
values should be:
Check that the rings move freely in the grooves and check the ring/
groove clearance using a feeler gauge (fig.18).
If the clearance exceeds the values shown in the table, renew the
piston and the piston rings.
Piston rings must always be renewed after dismantling
the piston.
Piston diameter check: The diameter of the piston must be
measured at approximately 18 mm from the base (fig.19).
Fitting mm Max. wear mm
Piston ring
1st Compression
2nd- 3rd Compression
4th Oil scrapper
Max. wear mm
Engine
Diameter mm
Fitting mm Max. wear mm
Piston ring
Compression
Oil scrapper
Check the clearance between cylinder and piston, if it is greater
than 0.120 mm both cylinder and piston must be replaced.
Assembly clearance between piston pin and piston in millimetres:
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