Boating Solutions Mercruiser Sterndrive Lower Unit Water Pump Chart
Mercruiser Sterndrive Water Pump Parts Guide
Reference Guides. If you don't find the part you are looking for you can email [email protected] or give us a call at 480-638-5608 and one of our tech support staff will help you locate the correct part you are looking for.
Boating Solutions carries a very large variety of Marine Parts and not all of our parts may be listed within the Part
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Mercruiser Generation II Water Pump
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Part Sequence for Above Mercruiser Pump Assembly |
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| Sequence | Description | Part No. | Quantity |
| 1. | Face Plate | 18-3122 | 1 |
| 2. | Housing Assembly | N/A | 1 |
| 3. | Gasket, Base | 18-2564 | 1 |
| 4. | Gasket, Housing | 18-2566 | 1 |
| 5. | Seal, Face | 18-2599 | 1 |
| 6. | Screw, Housing | N/A | 4 |
| 7. | Impeller | 18-3056 | 1 |
| 8. | Coupling, Assembly | N/A | 1 |
| 9. | O-Ring | 18-7420 | 2 |
| 10. | Sleeve | N/A | 1 |
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Mercruiser MR Alpha Water Pump
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Part Sequence for Above Mercruiser Pump Assembly |
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| Sequence | Description | Part No. | Qty |
| 1. | Guide, Sleeve | 18-3109 | 1 |
| 2. | Seal, Sleeve Guide (Included in 18-3109) | 18-3110 | 1 |
| 3. | Ring, Upper | 18-7158 | 1 |
| 4. | Ring, Dust | 18-7426 | 1 |
| 5. | Nut, Housing | N/A | 1 |
| 6. | Washer, Housing | 18-4270 | 3 |
| 7. | Screw, Housing | N/A | |
| 8. | Housing, Water Pump | 18-3116 | 1 |
| 9. | Cup, Impeller (Included in 18-3116) | 18-3114 | 1 |
| 10. | Impeller | 18-3017 | 1 |
| 11. | Gasket, Impeller | 18-2915 | 1 |
| 12. | Plate, Impeller | 18-3117 | 1 |
| 13. | Gasket, Stainless Steel Plate | 18-2914 | 1 |
| 14. | Water Pump Base Assembly | 18-3420 | 1 |
| 15. | Oil Seal, Water Pump Base (Included in 18-3420) | 18-2013 | 1 |
| 16. | Gasket, Water Pump Base | 18-2919 | 1 |
| 17. | Oil Seal, Water Pump Base (Included in 18-3420) | 18-2014 | 1 |
| 18. | O-Ring, Water Pump Base | 18-7176 | 1 |
| 19. | Pin, Alignment | N/A | |
| 20. | Nut, Housing | N/A | |
| 21. | Washer, Housing | 18-4269 | 2 |
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Mercruiser IR/R Water Pump Assembly
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Part Sequence for Above Mercruiser Pump Assembly |
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| Sequence | Description | Part No. | Qty |
| 1. | Guide, Water Tube | 18-3109 | 1 |
| 2. | Grommet, Water Tube Guide (Included with 18-3109) | 18-3110 | 1 |
| 3. | O-Ring | 18-7158 | 1 |
| 4. | Seal, Dust Cover | 18-7426 | 1 |
| 5. | Nut, Housing Retainer | 18-3723 | 1 |
| 6. | Nut, Housing Retainer | 18-3722 | 2 |
| 7. | Washer, Housing Retainer | 18-4269 | 3 |
| 8. | Bolt, Housing Retainer | 18-3226 | 1 |
| 9. | Washer, Housing Retainer | 18-4270 | 1 |
| 10. | Housing, Impeller | 18-3116 | 1 |
| 11. | Cup, Impeller (Included with 18-3116) | 18-3114 | 1 |
| 12. | Impeller | 18-3017 | 1 |
| 13. | Key, Impeller | N/A | |
| 14. | Gasket, Impeller | 18-2915 | 1 |
| 15. | Wear, Plate Impeller | 18-3117 | 1 |
| 16. | Gasket, Wear Plate | 18-2914 | 1 |
| 17. | Pin, Alignment | 18-3227 | 1 |
| 18. | Base Assembly | 18-3417 | 1 |
| 19. | Oil Seal, Base Assembly (Included in 18-3417) | N/A | |
| 20. | Oil Seal, Base Assembly (Included in 18-3417) | 18-2014 | 1 |
| 21. | O-Ring, Base Assembly | 18-7162 | 1 |
| 22. | Gasket, Base Assembly | 18-2826 | 1 |
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Complete Water Pump Kits and Impeller Applications |
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| Model | Serial Number | Complete Water Pump Kit | Upper Pump Hsg. | Upper Pump Kit | Water Pump Base | Impeller Repair Kit | Impeller |
| #1 Units with plastic flush housing | 2495186-2763441 | 18-3321 | 18-3116 | 18-3517 | 18-3421 | 18-3217 | 18-3017 |
| #1 Units (Except MR/Alpha) w/o flush housing screw in gear housing | 2763442-6854392 | 18-3317(1) | 18-3116 | 18-3517 | 18-3417(1) | 18-3217 | 18-3017 |
| MR/Alpha I | 6854393-D594568 | 18-3320 | 18-3116 | 18-3517 | 18-3420 | 18-3217 | 18-3017 |
| Alpha I - Generation II | D494569 & Above | - | - | - | - | 18-3214 | 18-3056 |
| (1) Models which have been retro-fitted with an Alpha Style lower Unit (no pre-load pin in top of drive shaft) must use Alpha style parts (18-3320 and 18-3420) | |||||||
