A) Lay the crankshaft on the prisms.
b) Using a dial indicator, check the beating of the crankshaft on the central main journal.
Max Runout:
- 4A-FE, 5A-FE, 7A-FE — 0,03
- 2C - 0.05
- 3S-FE, 4S-FE - 0.06mm
If the runout is greater than the maximum allowable, replace the crankshaft.
2. Check the connecting rod and main journals.
A) Using a micrometer, measure the diameter of each connecting rod and main journal in two mutually perpendicular planes, as shown in the figure.
Main journal diameter:
2C:
- nominal - 56.982 - 57.000 mm
- repair - 56.745 - 56.755 mm
3S-FE, 4S-FE:
- nominal - 54.988 - 55.003 mm
- repair - 54.745 - 54.755 mm
4A-FE, 5A-FE, 7A-FE:
- nominal - 47.982 - 48.000 mm
- repair - 47.745 - 47.755 mm
Crankpin Diameter:
2C:
- nominal - 50.488 - 50.500 mm
- repair - 50.245 - 50.255 mm
3S-FE:
- nominal - 51.985 - 52.000 mm
- repair - 51.735 - 51.755 mm
4S-FE:
- nominal - 47.985 - 48.000 mm
- repair - 47.745 -47.755 mm
4A-FE, 5A-FE:
- nominal - 39.985 - 40.000 mm
- repair - 39.745 - 39.755 mm
7A-FE:
- nominal - 47.988 - 48.000 mm
- repair - 47.745 - 47.755 mm
If the diameters are outside the specified limits, check the oil clearances. Regrind or replace crankshaft if necessary.
Note: the repair diameter of the necks is reduced by 0.25 mm compared to the nominal one.
b) Check the crankpins and main journals for taper and out-of-roundness as shown in the previous figure.
- Maximum taper and ovality - 0.02 mm
If the taper or out-of-roundness is more than acceptable, replace the crankshaft.
If necessary, grind the connecting rod and main journals to the repair size and select the bearings of the repair (reduced by 0.25 mm) size.