16 ENGINE 134
305603-10
– Measure the piston at the piston skirt, at right angles to the piston pin, at a
distance
.
Guideline
Distance
31.5 mm (1.24 in)
Piston - diameter
Size I 101.955… 101.965 mm (4.01397…
4.01436 in)
Size II 101.965… 101.975 mm (4.01436…
4.01476 in)
Info
Piston size
is marked on the piston head.
16.4.14 Checking piston ring end gap
305590-10
– Remove the piston ring from the piston.
– Place the piston ring in the cylinder and align it with the piston.
Guideline
Under the upper edge of the cylinder 10 mm (0.39 in)
–
Measure the end gap with a feeler gauge
.
Guideline
Piston ring end gap
Compression rings ≤ 0.80 mm (≤ 0.0315 in)
Oil scraper ring ≤ 1.00 mm (≤ 0.0394 in)
» If the end gap is more than the specified value:
– Check/measure the cylinder. ( p. 132)
» If the cylinder wear is within the tolerance range:
– Change the piston ring.
– Mount the piston ring with the marking facing toward the piston head.
16.4.15 Determining the piston/cylinder mounting clearance
305645-10
– Check/measure the cylinder. ( p. 132)
– Check/measure the piston. ( p. 133)
– The smallest piston/cylinder mounting clearance is the result of the smallest cylin-
der bore diameter minus the largest piston diameter. The largest piston/cylinder
mounting clearance is the result of the largest cylinder bore diameter minus the
smallest piston diameter.
Guideline
Piston/cylinder - mounting clearance
New condition 0.035… 0.060 mm (0.00138…
0.00236 in)
Wear limit 0.10 mm (0.0039 in)
16.4.16 Checking the oil pumps for wear
Info
The oil pump wear check shown here is on the suction pump but it applies to all oil pumps.
305663-10
–
Use a feeler gauge
to measure the play between the external rotor and the
engine case as well as between the external rotor and the internal rotor.
Oil pump
Clearance between external rotor
and engine case
≤ 0.20 mm (≤ 0.0079 in)
Clearance between external rotor
and internal rotor
≤ 0.20 mm (≤ 0.0079 in)
Axial clearance 0.04… 0.08 mm (0.0016…
0.0031 in)
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