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MG MGB Technical - 7 blade plastic fan.

Hi All,

1971 MGB GT, 18V engine. Recently re built. New "long nose" water pump GWP114. Builder supplied a 7 blade plastic fan. Tried to fit it today,however the bolt pattern is incorrect.

Anyway around this or better to simply use the original 6 blade metal fan?

Cheers, Neil.
Neil Peniston

I still have the steel bladed fan on my 1972 GT. Often, though of changing to the plastic one apparently more efficient and quiter, but Perhaps your long nose water pump has got different hole positions? Have you checked to see if the steel fan will line up? If it does, its then its the new plastic fan that must be incorrect? Mike
J.M. Doust

"More efficient and quieter". More efficient, no doubt, BUT quieter!!!!! There was one on my GT when I bought it, that was the first thing to go in the bin! It sounded like I was being pulled along by a WW1 propeller. Put an electric one one, gain 5 bhp and run quieter!
Allan Reeling

I'm not aware that the hole patterns differed. The Parts Catalogue indicates that 3-blade fans were still fitted to German and Swiss cars for noise reasons (as both the 6-blade and the 7-blade are much noisier than the 3-blade) but used the same GWP130 pump as with the 7-bladed for all other markets. Also when the UK changed from 3-blade to 7-blade they kept the same GWP123 pump, changing to the GWP130 subsequently. Are you sure it is for an MGB? Also long-nose and short-nose pumps have the same pattern as both had variously 3, 6 and 7-blade fans.
PaulH Solihull

The bolt pattern is not symmetrical, rotate 90 degrees and try again
dominic clancy

Neil,

I changed my three blade fan for a seven blade fan and found that the holes on the seven blade fan would not line up with the holes on the drive shaft flange of the water pump, on closer inspection of the flange on water pump I found four more hole to secure the fan set closer to the flange shaft plus I think my water pump must have been a short nose pump because I had and aliminium spacer to fit with the fan,having said that the following year I removed the seven blade fan and run the engine without one plus an electric fan. witch comes in when required, Have a closer look at the pump flange there may be additional screw holes there.

Regards Patrick
P.T. Tighe

Indeed, short nose pumps need the spacer so the fan can be fitted the right way round without hitting the engine.
PaulH Solihull

This thread was discussed between 23/04/2012 and 24/04/2012

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