Alan Armstrong Posted January 9, 2023 Share Posted January 9, 2023 Hi All, About to assemble the water pump housing and pump. checking on fan belt alignment, the pump I have, may appear to be the incorrect one. Neither the housing or the pump was attached to my vehicle when bought. The engine I have has been identified as a Spitfire mk 3 ... Engine number is FD87315HE Should i be fitting the GWP 128 or the GWP 200? As usual all help much appreciated! KR Quote Link to comment Share on other sites More sharing options...
RobPearce Posted January 9, 2023 Share Posted January 9, 2023 Canley list GWP200 for Heralds and round-tail Spitfires. GWP201 is for the six cylinder. GWP128 is listed for Mk4/1500 non-viscous, so I suspect it differs only in having a larger pulley diameter (to suit the alternator setup). They should have the same depth, so the same fan belt alignment. Quote Link to comment Share on other sites More sharing options...
Clive Posted January 9, 2023 Share Posted January 9, 2023 Yes, the herald/early spit variety should be correct. 6 cylinder water pumps are not drilled/tapped for the fan. Not sure about the offset either, I have a murkey recollection about some combination not working. Quote Link to comment Share on other sites More sharing options...
Martins Stag Posted January 9, 2023 Share Posted January 9, 2023 Clive i am 90& sure there is a different offset too..... Quote Link to comment Share on other sites More sharing options...
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