crankshaft pully nut

[mick19691]

hi there im having problems removing the nut on the crankshaft pully what makes it harder is that i cant lock the wheel with anything because the woodruff key has gone so the pully is just spinning on the shaft this i need to remove it to fit a new key i read somewere on here that if i put a spanner on the nut the locked it against something that i could turn the engine over and this would loosen the nut not sure if this is a good idea i dont want to do anymore damage to the engine any ideas i would be greatfull need to get my machine back on the road
thanks
mick

[BUSHWHACKER]

hi there im having problems removing the nut on the crankshaft pully what makes it harder is that i cant lock the wheel with anything because the woodruff key has gone so the pully is just spinning on the shaft this i need to remove it to fit a new key i read somewere on here that if i put a spanner on the nut the locked it against something that i could turn the engine over and this would loosen the nut not sure if this is a good idea i dont want to do anymore damage to the engine any ideas i would be greatfull need to get my machine back on the road
thanks
mick

No need to turn the engine over for long, just a quick flick of the key is all thats needed.

[mick19691]

crankshaft pully

cheers for that came of strait away but it is worse than i thought pully is worn really bad ovel shaped original woodruff key not even there plus the slot that the key fits into on the crankshaft is worn away on one side dont want to have to have to get a new shaft will cost a fortune was thinking of getting another pully and key and maybe fill the gap on the shaft up with abit of weld or something like chemical metal or even weld the key onto the shaft see if this will work
thanks
mick

[gregork]

wonder if the key was originally damaged by someone locking the pully in order to remove the crankshaft bolt seems that this method will put all of the strain on the key. how you gonna tighten it up? what worked for me is if you look under the vehicle on the bell housing there is a plastic cover about 3"x2" if you remove it (may need a torch) you can see the flywheel teeth i used an old cut off spanner shaft to lock the teeth/crank shaft, was a bit fiddly putting the cover back on but had no bother removing/tightening the nut.

[mick19691]

crankshaft pully

thanks ill try that way to tighten it up,do you think that tacking the woodruff key in were the shaft has worn then filling it up with weld will work, i cant see why it shouldnt as long as i just tack it first then try the pully on before welding it perminently
thanks
mick

[gregork]

sounds worth a try, i think i read somewhere its possible to damage the alternator when welding on the vehicle ??something to do with a voltage regulator. may be worth checking this out or disonecting the alternator wiring before you start.

[gregork]

sounds worth a try, i think i read somewhere its possible to damage the alternator when welding on the vehicle ??something to do with a voltage regulator. may be worth checking this out or disonecting the alternator wiring before you start.

[coolsv650]

thanks ill try that way to tighten it up,do you think that tacking the woodruff key in were the shaft has worn then filling it up with weld will work, i cant see why it shouldnt as long as i just tack it first then try the pully on before welding it perminently
thanks
mick

an Engineering work shop should be able to weld it up and cut it back, but they would probably need the crank out to do it so it's a bit difficult, (not to mention expensive) my only worry leaving the crank in would be the heat of welding damaging the oil seal, you really don't have much option, I don;t think chemical metal would last long

Sounds like the pully has run loose at some time

[mick19691]

iv also read something about the alternator being damaged when welding ill disconect it untill iv finished as for damaging the oil seal id already thought about this and thought if i tack abit at a time then let it cool in between building it up then it should be fine set my welder on low amps will be doing it this weekend will up date when finished
thanks
mick

[NiftyNev]

Here's a suggestion. May be worth a try. Get a new crank seal. Remove old seal before welding and pack this area with a wet cloth to act as a heat sink and also to protect the seal area. Install new seal after welding completed.

Also when welding on the crank install the bolt so you can use it as the earthing point. The closer you have the earth to where you are welding the better. Good luck. Sounds like a bugger of a job.

Nev

[mick19691]

thanks for all the advice fellas im going to do it at the weekend see how it goes
cheers
mick

[mick19691]

crankshaft pully

job done surfs working fine it was alot easyer than i thought first of all i made a new woodruff key out of stainless steel using an original carbon steel one i got from roughtrax to make a match held the key on to the crankshaft with moalgrips so that it didnt move when welding also used the moalgrips to clamp the earth onto for the welder put a small tack on using stainless rods.tested the pully on then filled up the worn area with weld using a steel cutting burr i ground back the excess fitted the pully put some thead lock on the bolt then tightened it up new belts on attached the fan reattached the earths of the battorys and she's running fine.so thanks for all the great ideas fellas im now a happy chappy once again
cheers
mick