1) Check cylinder bore class on top of block (1, 2 or 3) and select pistons of the same class.
Note: Pistons are installed complete with piston pins.
When the cylinder block is reused:
- 1) Measure the inner diameters of the cylinders.
- 2) According to the table below, according to the measurements obtained, take pistons of the same class.
Pistons selection table
Unit: mm
Crankshaft journal diameter
Using a micrometer, measure the diameter of the crankshaft main journal.
- Standard diameter: 54.956 - 54.980 mm
Crankshaft journal diameter
Using a micrometer, measure the diameter of the connecting rod journal of the crankshaft.
- Standard diameter: 47.956-47.974mm
Ovality and taper of the crankshaft journals
Using a micrometer, measure all the main and connecting rod journals at 4 different points as shown in the figure.
The ovality is determined by the difference in size between the axes A and B at points 1 and 2.
The taper is determined by the difference in size between points 1 and 2 along the axes A and B.
- Limit ovality: 0.005 mm
- Limit taper: 0.005 mm