Withdrawal
1. Thread a long bolt 6x100mm (or a long screwdriver of suitable diameter) into a special hole in the trunnion of the front balancing shaft and, using it to keep the shaft from turning, give the gear wheel mounting bolt.
2. Remove the rear balance shaft gear housing.
3. To lock the rear balance shaft, insert a bolt or screwdriver into the access hole (remove plug first) in the rear wall of the cylinder block. Loosen the rear shaft gear housing. Now unbolt and remove the gear of its drive from the shaft.
Note. Make a mark on the bolt at a distance of 74 mm from the end cut. The bolt must not be inserted deeper into the block than up to this mark.
4. Remove the oil pump cover.
5. Turn out two fixing bolts and remove a persistent plate of a forward balancing shaft. Carefully remove the shafts from the block - try not to damage the bearing surfaces.
Examination
1. Thoroughly wipe the shafts and carefully inspect their journals for nicks, scratches, signs of excessive wear, and signs of overheating. Usually the wear of the necks is manifested in the appearance of areas polished to a mirror finish.
2. Using a micrometer, measure the diameters of the front and back edges of each of the necks. The difference between the measurement results corresponds to the amount of taper present. If the taper exceeds the value allowed for spices, the shaft must be replaced.
3. Alternately place each of the shafts in V-shaped blocks and fix the dial gauge in the plane perpendicular to the axis of the shaft (DTI) so that its plunger touches the surface of the middle neck. By rotating the shaft in blocks, determine the amount of its runout. Compare the measurement results with the requirements of the Specifications, excessively bent shafts must be replaced.
4. Measure the diameters of the shaft journals as well as the inner diameters of the respective bearings. By subtracting the results of the first measurements from the results of the second, determine the size of the shaft fit clearance in the bearings. Compare the measurement results with the requirements of the Specifications. If the measurement results are out of range, and the shafts themselves are in satisfactory condition, take the unit to a car service workshop in order to replace the bearings.