daverclasper Posted August 22, 2019 Report Share Posted August 22, 2019 Hi. My nut is quite rusted onto shaft. Will try pent fluid and maybe some heat, though is there also a way of locking the shaft, without damaging pulley or fan. Failing that, I can cut the nut off, though is it a common size thread to replace it. Cheers, Dave Link to comment Share on other sites More sharing options...
Paul H Posted August 22, 2019 Report Share Posted August 22, 2019 I used an impact wrench on mine , worked a treat . It was a Lidl one mains driven with 350nm Paul Link to comment Share on other sites More sharing options...
poppyman Posted August 22, 2019 Report Share Posted August 22, 2019 Impact wrench will do it every time, if yoy hav'nt got one? Take it to your local garage i am sure they will take it off for nowt. Tony. Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 23, 2019 Report Share Posted August 23, 2019 Yes battery ones are invaluable , good thing to put on your wish list My last one from a homebase sale with lithium battery was a snitch at £8 for a 3/8"drive they are much more than that Search around in the sales before you jump in. Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted August 23, 2019 Report Share Posted August 23, 2019 12 hours ago, daverclasper said: is there also a way of locking the shaft, without damaging pulley or fan. Don't be tempted to jam something down inside the internals to lock it - I've seen it done and supplied the replacement unit afterwards! Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 23, 2019 Report Share Posted August 23, 2019 wont some soft jaws in a vice or workmate ( use an old belt ) grip the pulley without distorting it ?? Link to comment Share on other sites More sharing options...
Paul H Posted August 23, 2019 Report Share Posted August 23, 2019 With an impact wrench securing the pulley shouldn’t be necessary ? Paul Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 23, 2019 Report Share Posted August 23, 2019 agree but Dave doesnt have one .....yet Pete Link to comment Share on other sites More sharing options...
daverclasper Posted August 23, 2019 Author Report Share Posted August 23, 2019 Thanks folks. Nope, haven't got an impact wrench (it's on my "ideal" list, though maybe it should be on the"must have"?). Haven't got an old fan belt either, though may try rope?. Dave Link to comment Share on other sites More sharing options...
Ben Caswell Posted August 23, 2019 Report Share Posted August 23, 2019 Use a short length of wood then tie a length of cord to the end and wrap the cord a few times around the pulley in the opposite direction to undoing the nut. Hold the wood in a vice or by hand and that should stop the pulley turning. Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 23, 2019 Report Share Posted August 23, 2019 Ben used to invent torture ideas as well these ideas do work Pete 1 Link to comment Share on other sites More sharing options...
Ben Caswell Posted August 23, 2019 Report Share Posted August 23, 2019 Ive got the scars to prove it🤥 Link to comment Share on other sites More sharing options...
daverclasper Posted August 26, 2019 Author Report Share Posted August 26, 2019 Hi. Intend fitting my apparently recon dynamo (if I can the pulley off the old one). It was bought off a private seller on ebay some years ago. Can I assume it is negative earth do you think. If not, what harm may it do if I fit it. Also is there a simple test to determine it's polarity please, if I should do this before I fit it. Cheers, Dave Link to comment Share on other sites More sharing options...
DanMi Posted August 26, 2019 Report Share Posted August 26, 2019 polarity is easy to change just quickly touch a wire from the positive (assuming negative earth) to the field terminal on the dynamo. I would always do ths when installing a new one anyway Link to comment Share on other sites More sharing options...
daverclasper Posted August 26, 2019 Author Report Share Posted August 26, 2019 Thanks Dan Electrickery not my strong point. So fit dynamo (so it it is earthed?), then would a wire from pos terminal of battery to small terminal on dynamo do it?. Cheers, Dave Link to comment Share on other sites More sharing options...
johny Posted August 26, 2019 Report Share Posted August 26, 2019 yes Dave the dynamo is earthed through the engine block and its earth lead. When you touch the +ve to the small terminal of the field coils a current will flow through them to earth so producing a magnetic field. This leaves a enough residual magnetism so that when the armature is spun it can produce a small amount of current which is fed back to the field winding via the contacts in the voltage regulator box. The magnetic field increases so the armature makes more current and so on until the output voltage supplied to the reg. is greater than the system voltage and it can be connected to recharge the battery. Link to comment Share on other sites More sharing options...
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