Compressor Housing, Turbine Housing Check that the housings are free from cracks or other damage caused by excessive wear and tear . Damaged parts should be replaced . Heat Shield Check that the heat shield is free from damage caused by wear and tear, heat or corrosion, and replace it if necesary . Bushing, Oil Deflector, Compressor Bearing Unfasten the four screws which hold the compression bearing (8) . Using a small copper mandrel, tap out the compression bearing and the bushing (9) . Then remove the circlips (10) inside the bearing housing and remove the two bearings (11) . Check that the parts are free from wear and tear and discolouration .
Damaged parts should be replaced even if the amount of wear and tear is within the permitted tolerances . Remove the packing ring (12) on the turbine shaft and the two packing rings (13) on the oil deflector . Clean the parts carefully . Measuring and Inspection Turbine Wheel and Shaft Check that the turbine wheel and shaft are free from mechanical damage . The vanes must not be worn or out of shape . Do not try to realign the vanes . Damaged parts should be replaced . Bushing Check measurement (A), which should not be less than 4 .07 mm . Oil Deflector Check measurements (B) and (C) . (B) should not be more than 1 .31 mm, (C) should not be more than 1 .11 mm .
Compressor Bearing Check the width of the bearing, and replace it if the amount of wear and tear is in excess of the permitted tolerance . Minimum permissible width is 3 .98 mm . Place the shaft on two supports, which should be under the bearing recesses, and check the throw at the end of the shaft . The maximum permissible throw is 0 .011 mm . Bearings Check the diameter of the shaft bearing recesses . The minimum permissible diameter is 7 .98 mm . Check the width of the shaft piston ring groove . Maximum permissible width Check the bearings for abnormal wear and tear or discolouration, and replacethem where necesary.Check the internal and external diameters of all bearings .
The external diameter should not be less than 12 .31 mm, the internal diameter should not be more than 8.04 mm . is 1 .29 mm .