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This plastigage method is
recommended as a simplest way of measuring the crankshaft
oil clearance.
Measure the crankshaft oil clearance using
a plastigage as follows:
1.Wipe off oil from the
crankshaft journal surface and the crankshaft bearing inner
surface.
2.Install the crankshaft.
3.Cut
a piece of plastigage whose length is equivalent to the
width of the bearing and place it on the crankshaft journal
in parallel with its axis.
4.Install the
crankshaft bearing cap carefully and tighten the bolts to
the specified torque.
5.Remove the bolts, then
remove the crankshaft bearing cap
carefully.
6.Measure the largest width of the
crushed plastigage using the ruler printed on the bag of the
plastigage.
Standard value:
0.018
- 0.036 mm <No.1,2,4,5>
0.024
- 0.042 mm
<No.3>
Limit: 0.1
mm
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1.Visually check the
cylinder block for scratches, rust, and any other corrosion.
Also check it for cracks using a flaw detecting penetrant.
If any defect is evident, replace the cylinder
block.
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2.Use a straightedge and
thickness to check the cylinder block top surface for warp.
Make sure that the surface is free from remaining gasket
material and other foreign matter.
Standard
value: 0.05 mm
Limit: 0.1 mm
3.Check
cylinder walls for scratches and seizure. If defects are
evident, rebore to an oversize or replace the cylinder
block.
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4.Use a cylinder to measure
the cylinder bore diameter and taper. If the cylinder is
worn badly, rebore it to an oversize and replace the piston
and piston rings with ones that match with the new bore
size.
Standard value: 86.5 mm
Cylindricity:
Less than 0.01 mm
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