- Engines:
- 3304 (S/N: 2KK26-UP)
- 3304 (S/N: 83Z1133-UP; 9HK537-UP)
- 3306 (S/N: 85Z14544-UP)
- 3306B (S/N: 2AJ1199-UP; 8JJ564-UP; 1CZ1510-UP; 9NR3503-UP)
- G3304 (S/N: 37Y3739-UP)
- G3306 (S/N: 07Y7163-UP)
- 3304 (S/N: 02B18170-UP; 04B27312-UP; 10E5518-UP)
- 3306 (S/N: 23C2864-UP; 66D50844-UP)
- 3306B (S/N: 1BM534-UP; 5GZ315-UP; 7JB11710-UP; 64Z28729-UP)
- 3304B (S/N: 1NS549-UP; 1PS647-UP; 13E1420-UP)
- 3306 (S/N: 84Z3236-UP)
- 3306B (S/N: 1RS638-UP; 9SL543-UP; 84Z3236-UP)
Description of Change: New water pump groups with many improvements are used on the following engines: 3304, 3304B, 3306, 3306B, G3304 and G3306 Engines. These improvements include the following items:
- Cast iron impeller with low inertia
- Stainless steel shaft that is resistant to corrosion
- A straight press fit between the impeller and the shaft that helps to prevent the components from becoming loose
- A water seal that is made as a single piece for improved fluid sealing
- An oil seal with a dual lip for improved fluid sealing
- Improved gasket between pump housing and cover
- Redesigned water pump housing that provides reduced inlet restrictions
- The water pump housing is redesigned in order to include a reservoir type weep hole. This design allows any small coolant drip that gets past the water seal to evaporate.
Adaptable To: The new water pump groups and the former water pump groups are identified in Table 1 through Table 3. The new water pump groups are available, as shown.
| Spur Gear Configuration | ||
| New Water Pump Group | Former Water Pump Group | Water Pump Group |
| 172-7760 | 155-0061 | 4P-9861 |
| 172-7763 | 155-0064 | 118-9728 |
| 172-7765 | 155-0066 | 116-7556 |
| 172-7768 | 155-0069 | 138-2899 |
| Helical Gear Configuration 7/16 Gear Retaining Bolt |
||
| New Water Pump Group | Former Water Pump Group | Water Pump Group |
| 172-7759 | 155-0060 | 7C-3633 |
| 172-7764 | 155-0065 | 7N-6210 |
| 172-7766 | 155-0067 | 7N-5908 |
| 172-7767 | 155-0068 | 7N-5909 |
| 172-7769 | 155-0070 | 8N-4252 |
| 172-7771 | 155-0072 | 7N-6208 |
| Helical Gear Configuration Service Replacement 3/8 Gear Retaining Bolt |
|
| New Water Pump Group | Former Water Pump Group |
| 172-7775 | 2P-0661 |
| 172-7776 | 2P-0662 |
| 172-7777 | 3N-2850 |
| 172-7780 | 7N-2510 |
- Parts Manual, SEBP2196, "3304B Gen Set Engine (63Z)"
- Parts Manual, SEBP2108, "3304B Gen Set Engine (9HK)"
- Parts Manual, SEBP2007, "3304B Gen Set Engine (85Z)"
- Parts Manual, SEBP1807, "3306B Gen Set Engine (2AJ)"
- Parts Manual, SEBP2031, "3306B Gen Set Engine (8JJ)"
- Parts Manual, SEBP2751, "3306B Gen Set Engine (1CZ)"
- Parts Manual, SEBP2532, "3306B Gen Set Engine (9NR)"
- Parts Manual, SEBP1257, "G3304 Ind Gas Engine (37Y)"
- Parts Manual, SEBP2412, "G3306 Ind Gas Engine (07Y)"
- Parts Manual, SEBP2156, "3304 Ind Engine (02B)"
- Parts Manual, SEBP2306, "3304 Ind Engine (04B)"
- Parts Manual, SEBP1400, "3304 Ind Engine (10E)"
- Parts Manual, SEBP2809, "3306 Ind Engine (23C)"
- Parts Manual, SEBP1967, "3306 Ind Engine (66D)"
- Parts Manual, SEBP1451, "3306B Ind Engine (7JB, ; 64Z)"
- Parts Manual, SEBP2799, "3306B Ind Engine (1BM, ; 5GZ)"
- Parts Manual, SEBP2516, "3304B Marine Aux & Gen Set Engine (1NS)"
- Parts Manual, SEBP2521, "3304B Marine Aux & Gen Set Engine (1PS)"
- Parts Manual, SEBP1405, "3304B Marine Engine (13E)"
- Parts Manual, SEBP1407, "3306 Marine Engine (84Z)"
- Parts Manual, SEBP2519, "3306B Marine Aux & Gen Set Engine (1RS)"
- Parts Manual, SEBP1407, "3306B Marine Engine (9SL, ; 84Z)"
 | |
| Illustration 1 | g00687466 |
(A) 7N-0200 Gasket (Water Outlet) (B) 2P-0406 Gasket (Water Outlet) | |
There are two different shaft lengths that are available for the new pump:
- 74.4 mm (2.93 inch)
- 80 mm (3.15 inch)
Note: When the impeller is pressed onto the shaft, a face clearance of 0.65 to 0.9 mm (0.025 to 0.035 inch) must be obtained. The face clearance is measured between the top of the impeller vanes and the water pump housing. The new shafts are ground on the end in order to produce a highly accurate shaft length. This will allow a depth dimension to be made from the back of the impeller to the 4 bolt flange of the water pump housing and the desired face clearance will be produced. The depth dimension will be dependent on the pump that is being used. The new pumps have a depth dimension of 0.800 ± 0.314 mm (0.032 ± 0.012 inch). The parts service pumps have a depth dimension of 0.254 ± 0.064 mm (0.010 ± 0.003 inch). This dimension should be obtained if the impeller is pressed onto the shaft that is shown in Illustration 2.
 | |
| Illustration 2 | g00687553 |
(C) The hub of the impeller is flush with the shaft. (D) The outer diameter of the impeller is flush with the shaft. (1) Water Pump Shaft (2) Pump Impeller (3) Water Pump Shaft (4) Pump Impeller | |
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.
| 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 |
- Inner bearing
- Outer bearing
- Latest 172-0038 Gasket
- 154-4482 Seal
- One-piece 169-1750 Seal Group
- Some miscellaneous pieces
Remanufactured water pumps are available and the proper remanufactured water pump can be identified in Table 5.
Note: Remanufactured water pumps are recommended instead of rebuilding.
| Available Remanufactured Water Pumps | |
| Remanufactured Water Pump Part Number |
Applicable Water Pump Group |
| 0R-9782 | 172-7759 |
| 0R-9783 | 172-7760 |
| 0R-9784 | 172-7764 |
| 0R-9785 | 172-7765 |
| 0R-9786 | 172-7766 |
| 0R-9787 | 172-7767 |