Contents: Removal ⇊ Examination ⇊
Removal
1. Insert a long 6x100 mm bolt (or a long screwdriver of a suitable diameter) into a special hole in the journal of the front balance shaft and, holding the shaft from turning with it, loosen the gear 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 the plug first) in the rear wall of the cylinder block. Unbolt the rear shaft gear casing. Now unbolt and remove the shaft drive gear from the shaft.
Note: Make a mark on the bolt at a distance of 74 mm from the end cut. The bolt should not be inserted into the block deeper than this mark.
4. Remove the oil pump housing.
5. Remove the two mounting bolts and the front balance shaft thrust plate. Carefully remove the shafts from the block, being careful not to damage the bearing surfaces.
Examination
1. Carefully wipe the shafts and carefully inspect their journals for scoring, scratches, signs of excessive wear and traces of overheating. Usually, wear of the journals is manifested by the appearance of areas polished to a mirror shine.
2. Using a micrometer, measure the diameters of the front and rear edges of each journal. The difference between the measurement results corresponds to the amount of taper present. If the taper exceeds the permissible value according to the specifications, the shaft must be replaced.
3. Place each shaft in turn in V-shaped blocks and fix a dial gauge (DTI) in a plane perpendicular to the shaft axis so that its plunger touches the surface of the middle journal. Rotate the shaft in the blocks to determine its runout. Compare the results of the measurements with the requirements of the Specifications; excessively bent shafts are subject to replacement.
4. Measure the diameters of the shaft journals and the inside diameters of the corresponding bearings. By subtracting the results of the first measurements from the results of the second, determine the value of the clearance of the shaft fit in the bearings. Compare the measurement results with the requirements of the Specifications. If the measurement results are outside the permissible range, and the shafts themselves are in satisfactory condition, deliver the unit to a service workshop for the purpose of replacing the bearings.
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