17 ENGINE
154
17.4.17 Measuring the piston/cylinder mounting clearance
306589-10
17.4.18 Checking the oil pumps
Info
-
Check/measure the cylinder. (
�
p. 152)
-
Check/measure the piston. (
�
p. 153)
The smallest piston/cylinder mounting clearance equals the smallest cylinder bore
diameter minus the largest piston diameter. The largest piston/cylinder mount-
ing clearance equals the largest cylinder bore diameter minus the smallest piston
diameter.
Guideline
Piston/cylinder - mounting clearance
Size I
0.040 ... 0.082 mm (0.00157 ...
0.00323 in)
Size II
0.043 ... 0.085 mm (0.00169 ...
0.00335 in)
Wear limit
0.120 mm (0.00472 in)
The following steps apply to both oil pumps.
-
Use special tool
O
to measure the play between the external rotor and the
engine case.
I
Feeler gauge (590290411 00) (
�
p. 229)
Oil pump
External rotor/engine case clear
ance
I :;;
0.20 mm (:;; 0.0079 in)
If the measured value does not meet specifications:
-
Change the oil pump and, if necessary, the engine case.
-
Use special tool
O
to measure the play between the external rotor and the inter-
nal rotor.
I
Feeler gauge (590290411 00) (
�
p. 229)
Oil pump
External rotor/internal rotor clear
ance
I :;;
0.20 mm (:;; 0.0079 in)
If the measured value does not meet specifications:
-
Replace the oil pump.
17.4.19 Disassembling the autodecompressor
304673-10
-
Take lock ring
O
from the autodecompression shaft and dispose of it.
Содержание FS 450 2015
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