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In the earliest days of British cars in America, it was not uncommon to find a rebuild kit for your water pump! Today it's a thing of the past; replacements are easy to find and cheap. These standard capacity water pumps with steel impellers in aluminum bodies will fit all Morris Minors, Minis and Sprites and Midgets before the 1500cc.
Austin Mini Small Bore Water Pump

Austin Mini Small Bore Water Pump

Austin Mini Small Bore Water Pump

Austin Mini Small Bore Water Pump

Austin Mini Small Bore Water Pump
Selected: Water Pumps for Small Bore Engines to 1098cc
Part No: 10M294
SALE Price $42.22
Qty:
List: $47.98 You save: $5.76
Discounts Do Not Apply
Fits the following:
Classic Mini
Sprite & MG Midget
Morris Minor
Alternate Products
Classic Austin Mini Water Pump Fitting Kit For Gwp132/34
$27.24 Classic Austin Mini Water Pump Fitting Kit For Gwp132/34
These pumps have the same aluminum housing and the same deep impeller as the standard items; the only difference is that the bypass adapter has not been drilled. This means that if you are running without a bypass hose you don't need to plug it; therefore one less possible leak! It's warmer here than in the UK. This higher capacity water pump moves more coolant than the stock one, and is better quality. GWP134 has by-pass hose take off, GWP154 is without take off. These super high quality water pumps have a much larger than stock impeller; it sticks into the block slightly more than 1/2". The impeller in these aluminum bodied pumps is long lasting cast iron, not stamped steel as in many aftermarket pumps. This water pump will fit all 1275cc blocks, and with a slight amount of work on the impeller can be made to fit a small bore block. Use of a high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. Further reduction of cavitation is achieved by using a large diameter water pump pulley CAM6408 as originally fitted to the Cooper S and reintroduced on the A-Plus engines. It is necessary to check clearance between the large pulley and the head; if a lot of material has been machined from the head face it may foul the pulley. Small bore engines with 12G940 heads can't use CAM6408 and it is necessary to modify the top edge of the high capacity water pump or the 12G940 head will rest on the pump and not seal properly; modify for at least 1/16" gap.
This high capacity water pump without a 'bypass' was first used on the Mini in 1990. (Metro's started in the early 80's)
What makes a water pump "Competition"? These pumps have the same aluminum housing and the same deep impeller as the standard items; the only difference is that the bypass adapter has not been drilled. This means that if you are running without a bypass hose you don't need to plug it; therefore one less possible leak! It's warmer here than in the UK. This higher capacity water pump moves more coolant than the stock one, and is better quality. GWP134 has by-pass hose take off, GWP154 is without take off. These super high quality water pumps have a much larger than stock impeller; it sticks into the block slightly more than 1/2". The impeller in these aluminum bodied pumps is long lasting cast iron, not stamped steel as in many aftermarket pumps. This water pump will fit all 1275cc blocks, and with a slight amount of work on the impeller can be made to fit a small bore block. Use of a high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. Further reduction of cavitation is achieved by using a large diameter water pump pulley CAM6408 as originally fitted to the Cooper S and reintroduced on the A-Plus engines. It is necessary to check clearance between the large pulley and the head; if a lot of material has been machined from the head face it may foul the pulley. Small bore engines with 12G940 heads can't use CAM6408 and it is necessary to modify the top edge of the high capacity water pump or the 12G940 head will rest on the pump and not seal properly; modify for at least 1/16" gap. Can also be used on a Sprite and MG Midget .
It's warmer here than in the UK. This higher capacity water pump moves more coolant than the stock one, and is better quality. GWP134 has by-pass hose take off, GWP154 is without take off. These super high quality water pumps have a much larger than stock impeller; it sticks into the block slightly more than 1/2". This water pump will fit all 1275cc blocks and all 998cc blocks after 1969, and with a slight amount of work on the impeller can be made to fit a small bore block. Use of a high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. Further reduction of cavitation is achieved by using a large diameter water pump pulley CAM6408 as originally fitted to the Cooper S and reintroduced on the A-Plus engines. It is necessary to check clearance between the large pulley and the head; if a lot of material has been machined from the head face it may foul the pulley. Small bore engines with 12G940 heads can't use CAM6408 and it is necessary to modify the top edge of the high capacity water pump or the 12G940 head will rest on the pump and not seal properly; modify for at least 1/16" gap. Also fits Sprite & Midget 1098cc and 1275cc engines. Will also fit 948cc but slight mods to the black may be required - check fitment carefully. Includes water pump gasket.
Standard replacement water pump for all Mini's 1997 on.
These pumps have the same aluminum housing and the same deep impeller as the standard items; the only difference is that the bypass adapter has not been drilled. This means that if you are running without a bypass hose you don't need to plug it; therefore one less possible leak! It's warmer here than in the UK. This higher capacity water pump moves more coolant than the stock one, and is better quality. GWP134 has by-pass hose take off, GWP154 is without take off. These super high quality water pumps have a much larger than stock impeller; it sticks into the block slightly more than 1/2". The impeller in these aluminum bodied pumps is long lasting cast iron, not stamped steel as in many aftermarket pumps. This water pump will fit all 1275cc blocks, and with a slight amount of work on the impeller can be made to fit a small bore block. Use of a high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. Further reduction of cavitation is achieved by using a large diameter water pump pulley CAM6408 as originally fitted to the Cooper S and reintroduced on the A-Plus engines. It is necessary to check clearance between the large pulley and the head; if a lot of material has been machined from the head face it may foul the pulley. Small bore engines with 12G940 heads can't use CAM6408 and it is necessary to modify the top edge of the high capacity water pump or the 12G940 head will rest on the pump and not seal properly; modify for at least 1/16" gap.  Gasket is included.
3 YEAR GUARANTEE-UK made.Large impeller higher capacity water pump. Mini Spares product as original Rover Airtex tooling has been scrapped.

Fitted with a PPS, glass filled plastic impeller as used by Jaguar and Aston Martin it reduces weight on the bearing loading and a triple lip seal giving a better controlled flow rate through the rev range.The pump is about 130 gramms lighter and uses the rolled edge gasket facing evolved by rover for better sealing. Only for twin point injection cars.

This pump is high capacity but without the lug for attaching the alternator.

This pump is dimensionally the same to fit but is just missing the lug that the dynamo or alternator boled to--The MPI with a front mounted radiator used a different fixing arrangement.

3 YEAR GUARANTEE-UK made. Large impeller higher capacity water pump. Mini Spares product as original Rover Airtex tooling has been scrapped.

Fitted with a PPS, glass filled plastic impeller as used by Jaguar and Aston Martin it reduces weight on the bearing loading and a triple lip seal giving a better controlled flow rate through the rev range.The pump is about 130 gramms lighter and uses the rolled edge gasket facing evolved by rover for better sealing.

This larger impeller pump moved more coolant than the original early GWP132 standard pump. GWP134 has by-pass hose take off and GWP187 is without take off. These water pumps have a much larger impeller, it sticks into the block slightly more than 1/2"(14.03mm).

This water pump will fit all 1275cc blocks and all small bore blocks, with the exception of early 850/997cc units. These will need an amount of modification, relieving corrosion and slight material from the liner wall and impeller if required should enable clearance, try spinning pump loosely fitted without gasket for clearance. The high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. Further reduction of cavitation is achieved by using a large diameter water pump pulley CAM6408 as originally fitted to the Cooper S and reintroduced on the A-Plus engines. It is necessary to check clearance between the large pulley and the head, if a lot of material has been machined from the head face it may foul the pulley.

Small bore engines with 12G940 heads can't use CAM6408 and it is necessary to modify the top edge of the high capacity water pump or the 12G940 head will rest on the pump and not seal properly, modify for at least a 1/16" gap.

Use SH605101 x2 and BH605151x2 bolts.

See GWP134FK for complete fitting kit, with superseal gasket and new bypass hose.

Related Technical Articles:
Classic Mini Cooper Water Pumps & Thermostats page 16
Created: January 09, 2019
Complete selection of stock & high capacity water pumps as well as all thermostat housings used in the Classic Mini are now available. Radiator heater matrix and various by-pass hoses can also be selected.
1965 Austin-Healey Sprite/MG Midget Water Pump Replacement
Created: April 07, 2011
The impeller in these aluminum bodied pumps is long lasting cast iron, not cheaper stamped steel as in many aftermarket pumps. Use of a high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. (this is a good thing)
Cooling: Controlling Water Temperature
Created: July 23, 2003
The introduction of the Cooper S proved to be a testing time for the Mini's systems, but conveniently provide a guideline as to what the standard cooling system was capable of - that used on the 'S' was marginal to say the least! It wasn't uncommon for many S's to spew water from their overflow p
COOLING - How it works
Created: January 25, 2001
Very few understand just what the cooling system does and how it does it, and that incompatibility between the cooling system's capability and an upgraded engine can spell disaster for the new engine.
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