Sierra 18-3320 water pump kit for Mercury MerCruiser MR/Alpha I units with serial number between 6854393 to 0D469858. This is the same as the 18-3517 kit but also includes the base.

Part Number Cross Reference

• GLM 12120
• Mallory 9-48307

Contains These Sierra Parts

• 18-2801 Water Pump Gasket
• 18-2826 Water Pump Base Gasket
• 18-2914 Water Pump Gasket
• 18-2915 Water Pump Gasket
• 18-2919 Water Pump Gasket
• 18-2944 Seal Ring Gasket
• 18-2945 Drain Screw Gasket (x2)
• 18-3017 Impeller
• 18-3109 Water Tube Guide
• 18-3110 Water Pump Housing Bushing
• 18-3116 Water Pump Housing
• 18-3117 Impeller Plate
• 18-3420 Water Pump Base
• 18-7158 O-Ring
• 18-7162 O-Ring
• 18-7173 O-Ring
• 18-7176 O-Ring
• 18-7426 O-Ring

About Sierra
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.

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