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.
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.
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