Daedong DSC48, Руководство по ремонту

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2
-50 Apr. 2007
DSC48
417W298A
D. CRANKSHAFT
► FLYWHEEL DEFLECTION AND CRANKSHAFT
END PLAY
1. Set a dial indicator's top on the rear friction face of the
fl ywheel near the edge.
2. Turn the fl ywheel and measure the de fl ection or uneven
wear.
3. If the measurement exceeds the allowable limit, re-
move the fl ywheel and check the mating faces of the
crankshaft and fl ywheel.
4. If the mating faces are cracked or excessively worn,
resurface or replace the fl ywheel.
5. Move back and forth the crankshaft and flywheel to
their ends. And measure the end play.
6. If the play exceeds the allowable limit, replace the side
bearing.
► CRANKSHAFT ALIGNMENT
1. Support the camshaft's both end journals with V blocks
on a fl at table. And set a dial indicator with its tip on the
intermediate journal.
2. Rotate the crank shaft on the V block and get the ec-
centricity (half of the measurement).
3. If the misalignment exceeds the allowable limit, replace
the crankshaft.
417W299A
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10
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417W2A0A
► CRANKSHAFT JOURNAL AND BEARING 1 OIL
CLEARANCE
1. Measure the I.D. of the crankshaft bearing 1 with an
inside micrometer.
2. Measure the O.D. of the crankshaft journal with an out-
side micrometer.
3. If the clearance exceeds the allowable limit, replace the
crankshaft bearing 1.
Factory spec. Allowable limit
Valve stem
clearance
-
0.05 mm
0.002 in.
End play
0.15 ~ 0.31 mm
0.006 ~ 0.012 in.
25.05 mm
0.986 in.
Factory spec. Allowable limit
De fl ection -
0.02 mm
0.001 in.
Factory spec. Allowable limit
Clearance
0.040 ~ 0.118 mm
0.002 ~ 0.005 in.
0.20 mm
0.008 in.
Journal O.D.
51.921 ~ 51.940 mm
2.044 ~ 2.045 in.
-
Bearing 1 I.D.
51.980 ~ 52.039 mm
2.046 ~ 2.049 in.
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