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keyway problem

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keyway problem

Post  johnh1954 on Thu Jun 21, 2018 12:58 pm

Hi all finally got my 81 Falcon to run today alas only for a short while before it sheared the keyway on flywheel again this is 3rd keyway change i got the new keyways from villiers services so should be ok dont understand why it keeps doing it

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Keys

Post  piston 197 on Thu Jun 21, 2018 1:25 pm

The Keys are not the problem, the Key is only there for location, to ensure the magnets are in the right relevant position to the coils, it is the taper fit which determines the locking, either your taper on the shaft or inside the flywheel is damaged, or there is not enough tightening force being applied to the nut ?
If the female taper is not clean or smooth in the flywheel or the male taper on the crankshaft no key will hold the flywheel .
On the earlier 6E/8E engines there is no key at all and these hold perfectly well when both mating surfaces are good

You have changed the KEY not the KEYWAY, the Keyway is the slot in the shaft
JH
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piston 197
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thanks JH

Post  johnh1954 on Thu Jun 21, 2018 1:45 pm

Hi thanks for your help JH

johnh1954

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Flywheel

Post  kerabo on Thu Jun 21, 2018 5:00 pm

Try lapping it in with grinding paste. Coat the taper in coarse grinding paste and spend as much time as you can Turning it on the crank. Wipe and do it again until both surfaces show an even pattern. Then fit the key and flywheel .
Make sure the key is not do wide it binds on the flywheel stopping it seating.
Not sure what the torque us for that nut but be sure it's tight.

Ken
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Location : Falcon 87. Trials 93 Special. Powerbike 56. Falcon 81 Green Lane bitsa. Sunbeam S8. Honda Deuville.

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thanks

Post  johnh1954 on Fri Jun 22, 2018 10:58 am

Thanks Kerabo Very Happy

johnh1954

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Taper

Post  Kevin B Smith on Fri Jun 22, 2018 5:50 pm

And remeber - no oil on the shaft or the flywheel. From bitter experience!!


Kevin B Smith

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Re: keyway problem

Post  FBKev on Fri Jun 22, 2018 6:03 pm

I have had some 80s Husqvarna's & the ignition stator was the same, some had keys some didn't! just set the piston  @2mm BTDC and insert a pin through the stator & backplate, the tighten the nut (mostly motoplat mini 6) If there was any doubt about the taper it was out with the lapping paste (the condition/fit of the taper was critical) Or you would forever have the timing slip at the most inopportune moment.
Kev.


Last edited by FBKev on Fri Jun 22, 2018 6:57 pm; edited 1 time in total (Reason for editing : correction.)
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FBKev

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flywheel nut

Post  john87 on Sun Jul 01, 2018 4:47 pm

The tightening torque is 62 foot/lbs

I use a strap wrench to hold the flywheel as recommended by villiers. You CAN bash the nut round with a "hammertite" spanner. You CAN bend the crank and knacker the threads too..

Your choice..

P.S. You must clean both tapers SPOTLESS. I use isopropyl alcohol. This stuff is for cleaning electrical stuff. It is NOT "contact cleaner" that will leave a lubricant behind...

john..

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Torque loading

Post  kerabo on Sun Jul 01, 2018 8:02 pm

Where did you find the torque loading John.?

Regards Ken
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Torque

Post  john87 on Sun Jul 01, 2018 8:30 pm

Hi Ken,
I have got an original norton villiers maintenance manual. Villiers services do reprints of them too VEC 161 is the number of them.

Anyway, the units are all in inch/pounds, so need dividing by 12 to give foot/Lbs

Head bolts = 390

villiers magneto flywheel = 750

Final drive sprocket = 750

Engine sprocket = 950

Clutch centre nut = 390

Spark plugs = 145

Hope this helps!!

john..

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Torque settings

Post  kerabo on Mon Jul 02, 2018 7:22 pm

Nice one.
Worth keeping that .

Ken
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Re: keyway problem

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