ENGINE 126 Fig. 8 Fig. 9 Fig. 10 Fig. 7 5 Place the water pump housing on the fixture. 6 Place the water pump shaft in the housing with the threaded end up. 7 Apply grease on inner bearing and press it down with the help of mild steel tube 150 mm long, 25 mm OD and 16.5 ID. mm length of tube on one end should be turned to reduce OD to 23 mm. 8 With the same tool press down the spacer tube. The hardened surface of the spacer tube having the larger chamfer should be on the top. Spacer has an interference fit on shaft and should be heated in oil before pressing. 9 Apply grease on outer bearing inner race and press down with the help of this tube. 10 Fit outer race of outer bearing with special tool, Part No 312 589 03 39 or 2574 5890 99 04. Fig. 7. 11 Measure projection of outer bearing outer race top surface from water pump housing. Fig. 8. Then select shims of thickness 0.02-0.07 mm more than the projection measured. Apply graphite oil on the shaft surface mating with the outer seal. Fit seal in plate and fix plate with four screws, placing the selected shims with gasket between housing and plate. Tighten screws to specified torque and then lock them. 12 Fit new insert and rubber sleeve into the impeller. Fig. 9. 13 Invert water pump housing and press down impeller till a gap of 1 mm is maintained between the impeller vanes and housing. Ensure the gap with feeler gauge. Fig. 10. Impeller to be heated in oil before pressing.
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