Crankshaft bearing play, check (check crankshaft bearing play with a micrometer and internal measuring instrument)
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Crankshaft bearing play, check (check crankshaft bearing play with a micrometer and internal measuring instrument)
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1.
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Crankshaft removed.
Fit the crankshaft bearing cap together with the crankshaft bearing shell onto the engine block - tightening torque 50 Nm + 45° + 15°. The bolts can be used one more time for checking the crankshaft bearing play.
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2.
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The average crankshaft bearing diameter is measured with an internal measuring instrument at positions I, II and III and is calculated.
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Equation for calculating average big-end journal diameter:
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I + II + III
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Crankshaft bearing diameter
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3
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Example:
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I
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54.972 mm
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II
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54.981 mm
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III
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+ 54.984 mm
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164.937 mm
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divided by 3 = 54.979 mm
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Average crankshaft bearing diameter is 54.979 mm.
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3.
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The average crankshaft journal diameter is measured using a micrometer at positions I and II and then calculated.
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Equation for calculating average big-end journal diameter:
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I + II
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Crankshaft journal diameter
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2
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Example:
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I
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54.962 mm
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II
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+ 54.964 mm
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109.926 mm
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divided by 2 = 54.963 mm
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Average crankshaft bearing diameter is 54.963 mm.
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4.
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The crankshaft journal play is calculated using the different diameters of the crankshaft bearing hole and the crankshaft journal.
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Example:
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Average crankshaft bearing diameter
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54.979 mm
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Average crankshaft journal diameter
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- 54.963 mm
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0.016 mm
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Permitted crankshaft bearing play: 0.005 to 0.059 mm
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