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18 ENGINE
Guideline
Piston/cylinder - mounting clearance
Size I
0.035 ... 0.057 mm (0.00138 ...
0.00224 in)
Size II
0.037 ... 0.060 mm (0.00146 ...
0.00236 in)
Wear limit
0.070 mm (0.00276 in)
18.4.17 Checking the piston ring end gap
306113-10
18.4.18 Checking the camshafts
306755-10
18.4.19 Work on the intake camshaft
306756-10
-
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
1
20 mm (0.79 in)
-
Measure end gap
G
with a feeler gauge.
Guideline
Piston ring - end gap
Compression ring
I
$ 0.40 mm ($ 0.0157 in)
Oil scraper ring
I
$ 0. 70 mm ($ 0.0276 in)
If the end gap is greater than the specified measurement:
-
Check/measure the cylinder. (
�
p. 155)
If cylinder wear lies within the specified tolerance:
-
Replace the piston ring.
-
Mount the piston ring with the marking facing toward the piston head.
-
Check the camshaft for damage and wear.
If there is damage or wear:
-
Change the camshaft.
-
If the surface of the cams is damaged, check the oil supply to the
camshaft and cam lever.
-
Check the autodecompressor Qfor damage and wear.
If there is damage or wear:
-
Change the exhaust camshaft.
-
Remove lock ring
O.
-
Take off bleeder plate@.
-
Remove 0-ring (D.
-
Check the parts of the bleeder and replace if necessary.
-
Mount the new 0-ring.
-
Position bleeder plate
8.
-
Mount lock ring
Q.
157