301ENGINE
-
WORK
ON
THE
INDIVIDUAL
PARTS
Cbeckin
w.m
easulinlllle
piston
Cbacklnllha
piston
Ilnl
and
lap
- Check the piston sliding surface for damage.
•
If
the piston sliding surface
is
damaged:
- Replace the piston and,
if
necessary, the cylinder.
- Check
that
the piston rings move easily in the piston ring grooves.
•
If
a piston ring exhibits excessive resistance:
- Clean the piston ring groove.
•
Tip
I
An
old piston ring can
be
used
to
clean the piston ring groove.
- Check the piston rings for damage.
•
If
the piston ring is damaged:
- Replace the piston ring.
•
Info
I Mount the piston ring with the marking facing upward.
- Check the piston pins for discoloration or signs of wear.
•
If
the piston pin shows severe discoloration/signs of wear:
- Replace the piston pin.
- Place the piston pin in the connecting
rod
and check the seating for play.
•
If
the piston pin seating has excessive play:
- Replace the connecting
rod
and piston pin.
- Measure the piston at the piston skirt, parallel to the gudgeon pin,at a distance
of
•.
Guideline
Distance.
7 mm (0.28 in)
Piston - diameter
Size I
94.93
...
94.96
mm (3.7374 ...
3.7386
in)
Size II
94.94
...
94.97
mm (3.7378 ...
3.739
in)
•
Info
I Piston dimensions 0 are marked
on
the piston head.
- Remove the piston ring from the piston.
- Place the piston ring in the cylinder and align with the piston.
Guideline
I Below the upper edge
of
the cylinder 110 mm (0.39 in)
- Measure the end gap with feeler gauge
•.
Guideline
Piston ring end gap
Compression ring
,; 1 mm (,;
0.04
in)
Oil scraper ring
,; 1.2 mm (,; 0.047 in)
•
If
the end gap is greater than the specified measurement:
- Check/measure the cylinder. (
..
p.
126)
•
If
cylinder wear lies within the specified tolerance:
- Replace the piston ring.
- Mount the piston ring with the marking facing toward the piston head.
127
301ENGINE
-
WORK
ON
THE
INDIVIDUAL
PARTS
Cbeckin
w.m
easulinlllle
piston
Cbacklnllha
piston
Ilnl
and
lap
- Check the piston sliding surface for damage.
•
If
the piston sliding surface
is
damaged:
- Replace the piston and,
if
necessary, the cylinder.
- Check
that
the piston rings move easily in the piston ring grooves.
•
If
a piston ring exhibits excessive resistance:
- Clean the piston ring groove.
•
Tip
I
An
old piston ring can
be
used
to
clean the piston ring groove.
- Check the piston rings for damage.
•
If
the piston ring is damaged:
- Replace the piston ring.
•
Info
I Mount the piston ring with the marking facing upward.
- Check the piston pins for discoloration or signs of wear.
•
If
the piston pin shows severe discoloration/signs of wear:
- Replace the piston pin.
- Place the piston pin in the connecting
rod
and check the seating for play.
•
If
the piston pin seating has excessive play:
- Replace the connecting
rod
and piston pin.
- Measure the piston at the piston skirt, parallel to the gudgeon pin,at a distance
of
•.
Guideline
Distance.
7 mm (0.28 in)
Piston - diameter
Size I
94.93
...
94.96
mm (3.7374 ...
3.7386
in)
Size II
94.94
...
94.97
mm (3.7378 ...
3.739
in)
•
Info
I Piston dimensions 0 are marked
on
the piston head.
- Remove the piston ring from the piston.
- Place the piston ring in the cylinder and align with the piston.
Guideline
I Below the upper edge
of
the cylinder 110 mm (0.39 in)
- Measure the end gap with feeler gauge
•.
Guideline
Piston ring end gap
Compression ring
,; 1 mm (,;
0.04
in)
Oil scraper ring
,; 1.2 mm (,; 0.047 in)
•
If
the end gap is greater than the specified measurement:
- Check/measure the cylinder. (
..
p.
126)
•
If
cylinder wear lies within the specified tolerance:
- Replace the piston ring.
- Mount the piston ring with the marking facing toward the piston head.
127
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