Figure 3.34. Using a dial indicator to measure crankshaft axial play
Before removing the crankshaft, check its axial play. Install the indicator so that its measuring tip coincides with the axis of the crankshaft and touches the end of the shaft (figure 3.34).
Pull the crankshaft towards the rear of the engine with maximum force and in this position set the indicator scale to zero. Then move the crankshaft forward to the maximum distance and read the indicator readings. Axial play is equal to the distance the shaft has moved. If the axial play exceeds the value given in the technical data, check the wear of the shaft thrust flange surfaces. If the wear is minor, the play should be compensated by installing new main bearings.
Measuring axial play with a feeler gauge without an indicator is not easy, since the thrust half rings of the middle main bearing of the crankshaft are only on the seat side, but not on the cover side. Loosen each of the main bearing cap bolts by 1/4 turn until they can be turned freely by hand. Check the markings on the caps, which should match the cylinder number. Typically the covers are numbered starting from the front of the engine. If there is no marking, apply marks with a punch or stamp. The main bearing caps are cast with arrows pointing towards the front of the engine.
Using light hammer blows through a soft spacer, move the covers out of place and remove them from the cylinder block. If necessary, remove the covers by inserting the mounting bolts into them and using them as levers. Do not allow the main bearing to fall out if it remains in the cover.
Figure 3.35. Using an impact puller to remove a needle bearing from the end of a crankshaft
(Text taken from an online platform: MAZbook.ru)
Carefully remove the crankshaft from the cylinder block. It is recommended to do this with an assistant, as the shaft is quite heavy. Install the main bearing caps together with the bearings onto the cylinder block in the same order and tighten the bolts by hand. On manual transmission models, use an impact puller to remove the pilot needle bearing from the end of the crankshaft (figure 3.35).