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Crankshaft Bearing Clearance, Check (Determine
Bearing Clearance with Micrometer and Inside Micrometer)
The crankshaft is removed.
Install
Install crankshaft bearing cap with crankshaft bearing shell at
cylinder block – tightening torque 50 Nm / 37 lbf. ft. +
45° + 15°. To check the crankshaft bearing play, bolt can
be reused.
Measure
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The average crankshaft bearing diameter is measured using an
inside micro-meter at points I, II and III and then calculated.
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Formula for calculating the average con-rod bearing
diameter:
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I + II + III
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3
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Example:
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I
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57.972 mm
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II
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57.981 mm
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III
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+
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57.984 mm
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|
|
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173.937 mm
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divided by 3 = 57.979 mm
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The average con-rod bearing diameter is 57.979 mm.
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Measure
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The crankshaft journal diameter is measured with a micrometer at
points I and II and then calculated.
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Formula for calculating the average con-rod bearing
diameter:
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I + II
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2
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Example:
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I
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57.962 mm
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II
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+
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57.964 mm
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|
|
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115.926 mm
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divided by 2 = 57.963 mm
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The average crankshaft journal diameter is 57.963 mm.
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Measure
The crankshaft clearance is calculated
from the difference in diameter between the crankshaft bearing bore
and crankshaft journal.
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Example:
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|
|
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Average crankshaft bearing diameter
|
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57.979 mm
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Average crankshaft journal diameter
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–
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57.963 mm
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0.016 mm
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Permissible crankshaft bearing play: 0.015 to 0.043 mm.
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