2003/04/01 Caterpillar

New Water Pumps for 3500 Engines {1361, 1389}

Usage:

3512 1LM

Engine: Commercial
3500 Diesel

Engine 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.

Show/hide table

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.