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18 ENGINE
178
18.4.14 Checking piston ring end gap
Remove the piston ring from the piston.
Place the piston ring in the cylinder and align it with the piston.
Guideline
O
► •
i +A
A
f
B .
Under the upper edge of the cylinder
10 mm (0.39 in)
V
Measure the end gap with a feeler gauge
©
Guideline
Piston ring end gap
Compression rings
< 0.80 mm (< 0.0315 in)
305590-10
Oil scraper ring
< 1.00 mm (< 0.0394 in)
» If the end gap is more than the specified value:
-
Check/measure the cylinder. ( p. 176)
» 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.
18.4.15 Determining the piston/cylinder mounting clearance
Check/measure the cylinder. (IP p. 176)
Check/measure the piston. (IJ p. 177)
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)
311848-10
Wear limit
0.10 mm (0.0039 in)
18.4.16 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.
I
Use a feeler gauge O
to
measure the play between the external rotor and the
engine case as well as between the external rotor and the internal rotor.
f
O
©
Oil pump
m
Clearance between external rotor
and engine case
< 0.20 mm (< 0.0079 in)
f ftfjj)
1
i
62
Clearance between external rotor
and internal rotor
< 0.20 mm (< 0.0079 in)
it
ii
K
I*'
1
m
0.04... 0.08 mm (0.0016... 0.0031 in)
Sh
Axial clearance
1 lA.
311898-10
If the measured value does not meet specifications:
- Change the oil pump and, if necessary, the engine case.
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