Buckshot Racing #77 is offering the genuine Mercury Racing Large Tube Water Pump Housing, OEM part number 46-847710 T1. This is the correct large tube (also referred to as “big tube”) housing used on Mercury Hi-Performance Sportmaster and Torquemaster gearcases.
It is not a small production tube housing. It is the correct part for the large tube water delivery system found on actual Mercury Racing 2.4-liter and 2.5-liter V6 two-stroke platforms.
This housing is used on the well-known high-performance engines such as the 225 Pro Max, 245 HP Carb motors, 260 ROS, 280 HP, and 300 Drag. It applies to the Mercury Hi-Perf and Mercury Racing 2.4 and 2.5 families because those engines are frequently operated at engine heights and propeller slip conditions where a larger water column and stable volume are needed. The large tube architecture is not interchangeable with the small tube system, so the housing must match the tube size that is on the lower unit being serviced.
Mercury has cataloged this same housing under several equivalent OEM part numbers over the years. Cross references include 847710A1, 847710T1, 46-847710T1 and 46-847710A1. All of these reference the same Large Tube housing.
The Buckshot Racing #77 offering includes one (1) Mercury Large Tube housing, one (1) large tube grommet, and one (1) matching guide tube. These three components belong together as a set for proper sealing and proper impeller geometry in the large tube configuration.
This is the correct OEM configuration for Sportmaster and Torquemaster gearcases with the large water tube. If the water tube in the midsection adapter plate is approximately the diameter of an adult thumb, this is the correct style housing. If the tube is significantly smaller, that is the small tube configuration which uses a different housing.
Buckshot Racing #77 supplies this Genuine Mercury Racing OEM large tube water pump housing solution for owners, restorers, and competitors who are maintaining correct cooling hardware on high-performance Mercury Racing two-stroke equipment.
Included one (1) Mercury Big Tube Water Pump Housing (OEM Part # 847710), one (1) large Grommet (OEM Part # 88397), one (1) Guide Tube (OEM Part # 847685)
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.