PUMP GP-GEAR 1G8112 - Caterpillar

There are two water pump seals and three new impellers that are available. Two items must be known in order to select the correct water pump seal and the new impeller. The first selection criteria is the water outlet gasket that is mentioned above. If the 2P-0406 Gasket (water outlet) (B) is used, then the 172-6712 Pump Impeller with the short vane height is used. If the 7N-0200 Gasket (water outlet) (A) is used, then one of two impellers will be used. Measure the diameter of the seal bore in the water pump housing. If the bore measures 40.0 mm (1.58 inch), then the 172-5189 Pump Impeller (2) is used with the one-piece 169-1750 Seal Gp. The impeller (2) will be pressed on the shaft (1), until the impeller is flush with the end of the shaft (C). If the bore measures 32.7 mm (1.29 inch), then the 172-5190 Pump Impeller (1) is used with the two-piece 4W-3864 Seal Gp. The 172-5189 Pump Impeller and the 172-5190 Pump Impeller use the same same vane height, but the 172-5190 Pump Impeller has a counterbore for the two-piece seal. This counterbore has a diameter of 32.5 mm (1.28 inch) and a depth of 6.2 mm (0.24 inch). Both of the impellers (4) will be pressed on the shaft (3), until the diameter of the impeller is flush with the end of the shaft (D). Use 172-5711 Installer (Seal) in order to install the one-piece 169-1750 Seal Group .An alternate method can be used to check the position of the impeller on the shaft. Press the impeller onto the shaft, while the clearance is checked at intervals. The clearance is checked between the impeller and the water pump housing. Use a feeler gauge to check the clearance between the impeller and the water pump housing. The clearance should be 0.64 mm (0.025 inch).The 8C-5210 Lip Seal is used on water pumps with a two-piece water pump seal. The 154-4482 Seal is used on water pumps with a one-piece water pump seal. On both of the seals, the "cup" is installed toward the center of the housing and the lip of the seal is NOT lubricated.Rebuild kits are available and the proper rebuild kit can be identified in Table 4.Note: The 172-5185 Water Pump Shaft is included in all rebuild kits. The "Early" pumps that require the shorter 172-5188 Water Pump Shaft should not use any of these rebuild kits. When a water pump is rebuilt and the 172-5190 Pump Impeller and a kit are used, a 4W-3864 Seal Gp needs to be ordered.
Table 4
Available Rebuild Kits    
Rebuild Kit
Part Number     Applicable Water Pump Group    
170-0567     172-7759     172-7760    
172-7763 172-7766    
172-7768 172-7771    
           
170-0569     172-7764     172-7769    
           
170-0570     172-7765     172-7767    The proper rebuild kit is determined by the outer bearing that is used on the pump. If the