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Pision ring gaps
•
Compression rings (<<A» and "B» in fig. 42)
0.25 ..;. 0.45 mm (.0098";' .0177")
•
Oil scraper (<<C» in fig. 42)
0.20
-0.
0.45 mm (.0078 ..;. .0177'1
c
Re-assembly
When fitting the piston rings pay attention to the end
gaps which have to be out of line with each other.
5.6 -
a
REMOVAL OF PISTONS
To remove piston "0,, in fig. 42 from the small end
it is necessary to push out gudgeon pin
"E"
after re-
moving
its
retaining circlip
"F"
using tool 19907800
(3 in fig. 43).
When overhauling, always remove all carbon depo-
Sits from the piston crown and slots.
b
Checking operations
•
Ensure the piston-barrel clearance is as specified
0.014..;. 0.050 mm (.OOO55
-+-
.0019").
•
Check piston weights. Max permissible differen-
ce: 1.5 grams (.05 oz.).
•
The selection measurements indicated in the ta-
ble have to be taken
at
13
mm
(.511)
from the piston
base in an orthogonal sense to the piston pin axis.
Make sure the piston is marked with its selection let-
ter (A-B-C) and letter "C" (spark plug side). See ar-
rows 1 and 2 in fig. 46.
D
B
39L-________________________
~
40
41
L -____________________________
~42
31
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