SUPPORT ASSEM. 8P2426 - Caterpillar

Table 28
Tooling Required for 3500 Engines
Callout Qty Description
N 1 1A-LS-Lock Screw
O 1 L-32-12 5/16 ID Liner Bushing
Q 1 SF-20-22 .0985 ID Drill Bushing
28.44800 mm (1.12 inch) Long
R 2 5/16-18 x 1 SHCS
S 2 HL-32-8 5/16 ID Liner Bushing Shaft Replacement
The tapered shaft is not a serviceable part. It must be replaced with a current straight shaft. Refer to the Parts Manual for the correct part numbers. The impeller that matches the tapered shaft can be modified to fit a straight shaft. Refer to the section "Impeller Salvage for 3500 Engines" found within this document.
Illustration 99 g06281541
Seal angle for a 212-8179 Shaft.
Illustration 100 g06281543
Seal angle for a 430-9695 Shaft.
Some water pump models have updated the angle near the oil seal and applied a radius. This new angle is to prevent damage to the oil seal during assembly. The 212-8179 Shaft has been replaced with the 430-9695 Shaft. Refer to Illustrations 99 and 100 in this document. If you have the 212-8179 Shaft, then it must be replaced with a 430-9695 Shaft at the time of rebuild.Seal Group Replacement
The seal group must be replaced at every rebuild. The current 416-0603 Seal Group is a direct replacement for the 166-4375 Seal Group and the 124-5245 Seal Group found in former water pumps.Disassembly
Refer to the appropriate Disassembly and Assembly manual for specific instructions.
Illustration 101 g03465157
(1) Sleeve Bearing
(2) Thrust Washer
Illustration 102 g03465184
Example of a hydraulic sleeve bearing puller.
Some pumps have a sleeve bearing (1) installed refer to Illustration 101. The updated thrust washer makes removal of the thrust washers impossible with the sleeve bearing still in the housing. During disassembly, the sleeve bearing must be removed first, then the thrust washers unbolted and then the shaft pressed out. The sleeve bearing (1) must be removed without damaging the pump housing.Proper support of the water pump housing is critical for a successful disassembly. The use of a steel support plate in Illustration 103 is highly recommended. When pressing the shaft off the impeller and out of the housing the water pump housing must be fully supported to prevent flexing. If the housing flexes, then the housing can crack and destroy the housing. Refer to Illustrations 103 and 104 for an example of a supported water pump.
Illustration 103 g06281545
Support plate used for removal of the shaft.
(A) 38 mm (1.496 inch)
(B) 133.4 mm (5.252 inch)
(C) 382 mm (15.039 inch)
(D) 305 mm (12.008 inch)
Illustration 104 g03444021
Water pump successful disassembly.
Assembly
Refer to the appropriate Disassembly and Assembly Manual for a detailed procedure of the entire assembly process. This is a condensed version with the intent to highlight critical steps.
Install plugs.
Install the oil seal.
Lubricate the shaft with clean water. Then insert the shaft and thrust washers. Tighten the thrust washer bolts.
If a bearing sleeve was removed, install a new bearing sleeve.
Flip the housing over. Apply P80 lubricant to the bottom half of the shaft. Using a press, install stationary portion of the water seal into the housing. Constant force is required when installing the seal to prevent damage to the seal face.Do not use a hammer