•
Using a cylinder bore gauge, measure
cylinder liner inside diameter at 3 points
(cylinder top ring contacting face, middle,
and oil ring contacting face on BDC) in a
direction at an angle of 45
˚
.
Take the
mean value with the largest and smallest
values excepted.
•
The clearance is computed by subtracting
the piston outside diameter from the
cylinder liner inside diameter. Replace
either piston or cylinder liner, w h i c h e v e r
d a m a g e d m o r e , i f t h e clearance is
beyond the specified limit.
<Clearance between piston and liner>
3) Piston rings
(1) Visual check
Replace the piston rings with new ones if
detected worn or broken when the engine
is overhauled.
(2) Piston ring gap
•
Insert the piston ring into the upper por-
tion of the cylinder liner bore so that it is
held at a right angle to the cylinder liner
wall.
•
Measure the piston ring gap with a feeler
gauge.
Replace piston rings with new ones if the
gap is beyond the limit.
- 94 -
Standard
Limit
111 ~ 111.022 mm
111.122 mm
Standard
0.103 ~ 0.139 mm
Standard
Limit
Top ring
0.40 ~ 0.60 mm
1.5 mm
2nd ring
0.40 ~ 0.60 mm
1.5 mm
Oil ring
0.30 ~ 0.50 mm
1.5 mm
Summary of Contents for D1146
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