Water Pump Impeller Repair Kit for Mercury MerCruiser MR/Alpha One (Complete Kit with Base & Housing) units with serial number between 6854393 to 0D469858

Fits:

Mercruiser MR / Alpha One (Serial Number between 6854393 to 0D469858)

Replaces:

Mercruiser 46-96148A8

Sierra 18-3320

GLM 12120

Please Note:

There is some confusion about drives made in 1985 and 1986 as to which drive you have. If you do not know which drive you have, a #1 "R" drive or a later MR/Alpha drive you have to look at your engine serial number. If your serial number is BEFORE 6854393 it is an R it will use an early water pump kit UNLESS your lower unit has been updated at some time. If you can not identify a serial number, you can drop the lower unit.

If you have a pre-load pin on the top of the vertical shaft，you have the earlier #1 or "R" drive & this is NOT the correct kit. If your vertical shaft does not have a pre-load pin, it is a MR or Alpha Gen 1 drive & this IS the correct kit.The best way to be absolutely sure of the type of drive you have is to drop the lower unit & check to see if you have a preload pin or not

Package Contains:

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