CLIP 8N3480 - Caterpillar

Engine: Commercial
3500 DieselEngine News SEBD9318, February 2003, "New Water Pumps for 3500 Engines". Disregard this article. The correct information follows:Water pumps on 3500 engines have changed. The mating surface between the impeller and the shaft has changed from a tapered joint to a straight joint. The former parts are no longer serviced. The table provides a cross reference between the part numbers for the former pumps and the part numbers for the new pumps. In most cases, rebuild kits and remanufactured pumps are available. The rebuild kits are intended for use with both the former pump and the new pump.
Table 1
Cross Reference for 3500 Engine Water Pumps    
Former Pump     New Pump     New Shaft     New Impeller     Rebuild Kit     Remanufactured Water Pump    
156-9817     212-8167     212-8178     212-8181     N/A     N/A    
6I-3520     212-8168     212-8179     212-8183     221-9278     0R-4570    
7E-9781     212-8169     212-8179     212-8183     221-9278     0R-3192    
7E-9782     212-8166     212-8179     212-8183     221-9278     N/A    
166-4381     212-8172     212-8180     212-8184     222-5152     0R-9673    
166-4379     212-8173     212-8180     212-8185     N/A     N/A    
166-4382     212-8174     212-8180     212-8186     N/A     N/A    
166-4380     212-8175     212-8180     212-8187     222-5153     0R-9670    
166-4377     212-8176     212-8180     212-8187     222-5153     0R-9672    
166-4378     212-8177     212-8180     212-8184     222-5152     0R-9671    
199-5590     221-5352     221-5349     206-4282     N/A     N/A    
199-5589     221-5353     221-5348     206-4283     N/A     N/A    The procedure for disassembling the new water pumps and assembling the new water pumps is similar to the procedures for the former pump. During disassembly, a puller should be used to remove the impeller from the shaft. During assembly, the impeller should be pressed onto the shaft after the shaft is assembled into the housing assembly. Prior to pressing the impeller onto the shaft, the impeller and the shaft should be at room temperature. Apply a light coat of clean engine oil to the shaft before pressing the impeller onto the shaft. The force that is required will be a minimum of 3,855 kg (8,500 lb) with a nominal force of 14,060 kg (31,000 lb).Note: While you are pressing the impeller onto the shaft, force should not be placed on the housing assembly. The shaft should be placed in a fixture that is designed to absorb the load of the press while the impeller is pressed onto the shaft.When the face of the impeller and the face of the shaft are flush, the proper assembly dimensions for the water seal and the other pump components has been reached.