Taperlock pulley on Johnson raw water pump? Is this a good idea?

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SlowlyButSurely

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I need to replace the pulley on the raw water pump on my BMC 1.5. The pump is a Johnson F5B-8 with a 5" aluminium pulley which is located by a grub screw which bears against a flat on the 17mm pump shaft. The old pulley was pressed onto the shaft and took quite some effort to remove from the shaft.

It seems to me that the easiest thing to do would be to replace it with a taperlock pulley but I'm not sure if it would grip the shaft sufficiently as there is a flat on the shaft and there is no keyway. Has anyone done this before? I would really welcome any advice from anyone who has experience of taperlocks as I haven't used one before.
 
The taperlock will be much more secure than the grubscrew and alloy pulley. If you have a spare pulley on the engine, take the opportunity to fit a twin belt pulley to the pump, build in a bit of redundancy and less belt tension required to transmit the power to the pump.
 
Thanks very much for the advice chaps. I have now fitted the taperlock pulley and all seems fine. Absolute doddle to fit as well. Why on earth didn't they invent taperlocks years ago?

Being cast iron it is considerably heavier than the old aluminium pulley: 1Kg for the taperlock pulley compared with 238g for the old aluminium pulley. Is this likely to be a problem?
 
SlowlyButSurely said:
Thanks very much for the advice chaps. I have now fitted the taperlock pulley and all seems fine. Absolute doddle to fit as well. Why on earth didn't they invent taperlocks years ago?

Being cast iron it is considerably heavier than the old aluminium pulley: 1Kg for the taperlock pulley compared with 238g for the old aluminium pulley. Is this likely to be a problem?
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They did invent them many many years ago I can remember them being around most of my working life ie late 60s on. Made by fenners Yes they are heavy out of balance and overhang being two factors They are also expensive but ideal for maintainance and one off set ups
 
I wouldn't worry about the weight. It's a small yacht diesel engine - probably with a huge flywheel and inherently lousy throttle response anyway. If it was a formula 1 engine or something likely to hit a particularly vicious rev limiter, I might have thought twice, but as it is, I'm sure it will be fine.
 
I suspect the taperlock pulley is on the pump, not the engine.
From memory the pump shaft is on ballbearings, it should be ok !
 
scottie said:
They did invent them many many years ago I can remember them being around most of my working life ie late 60s on. Made by fenners Yes they are heavy out of balance and overhang being two factors They are also expensive but ideal for maintainance and one off set ups
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They must have invented taperlocks without letting me know. I seem to be finding this more and more these days!
 
I was amazed when trying to replace a timing belt on a Ford Focus that the main crankshaft pulley is located only using a taper fit-not woodruff or other sort of key. It seem that this is common now regardless of the consequences of getting the timing out or it slipping. Never did get it off despite brute force, a lot of time and eventually an expensive impact driver. Inspected the belt and it looked perfect so put it all back together. My local garage agreed that if it was that tight then best to leave well alone, particularly on an old car.
 
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