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Today is the day I'd planned to do the sprag clutch, thought I'd covered every angle,borrowed the few tools I didnt have, including a flywheel puller set with 10 different thread sizes..
One of them must fit a Falco..?
NO.. right size, wrong thread pitch, coarse thead on Falco, fine thread on every bloody thing else
Never come across that before,doesnt make any sense, the additional load a fine pitch thread can handle as opposed to coarse pitch.
Bollocks, catching the fucking bus again

Yes - a coarse thread in that application makes no sense at all. The designer had the choice - why make the wrong one?

The more I look into this the less fun it becomes....
Falc flywheel tool is only available as a 'genuine' part.
A standard 3 leg puller will not fit ( machinemart type that does not seem to fit anything, the feet on the end of the legs dont reach to the back of the stator).
Im hoping a high tensile bolt will do the job, looks like there is around 2mm of the crank end to push against,tell me if this is a bad idea.
Have seen a homemade one, airline fitting tapped to take a pusher pin, the Prilla item is just a bolt, turned down to leave a pusher pin, not exactly complex, assuming you have a lathe

Out of interest, how much do these cost to get done professionally?

mrapriliafalco wrote:Out of interest, how much do these cost to get done professionally?

£250-£350

I read something on AF1 about a workshop taking 8 hours to get a stator off !
I bought an oil cooler from a guy that was breaking an 03 Falc that was immaculate apart from the fact that the end of the crank had been bent by hammering, I wondered HTF had someone managed to do that ?
Now I know !
Loctite 648 is not a thread locking compound but a retaining compound and can only be released with heat.
If your bike motor was assembled by someone who was a bit to generous with the 648 compound then it may be a challenge

If a good puller could be sourced then it Sound's like the ideal item to have for a tool library to be able to hire out???



M22 x 1.5

I was thinking the same Iconic !
I had a puller made, 22mm x 1.25, perfect fit...
Got the stator to budge about 3mm then the threads gave up on the puller
I dont think the heat helped the puller, I also think mine was overdosed with Loctite, hence the drama.
Tommorrow I will have the puller re faced and case hardened, if that doesnt work I will have to buy some quality stainless or toolsteel and try plan C.

Does anyone have a pic of the genuine Aprilia puller? Shouldn't be too difficult to plagiarise...

What grade of steel would you need for the M22 thread, and is the pitch 1.25 or 1.5? Would a standard 12.9 High Tensile bolt be sufficient, assuming one could track one down in that size?

mangocrazy wrote:Does anyone have a pic of the genuine Aprilia puller? Shouldn't be too difficult to plagiarise...

What grade of steel would you need for the M22 thread, and is the pitch 1.25 or 1.5? Would a standard 12.9 High Tensile bolt be sufficient, assuming one could track one down in that size?

One of these for instance?

http://www.ebay.co.uk/itm/Daf-CF-XF-105 ... 417cd19f07

Yep, my previous photo was from AF1 forum (thats what they sell to do the job) but someone mentioned that a truck part was able to do the same job.

There was a question of hardness however, of the bolt that is

I had a puller made, 22mm x 1.25, perfect fit...

iconic944ss wrote:Yep, my previous photo was from AF1 forum (thats what they sell to do the job) but someone mentioned that a truck part was able to do the same job.

There was a question of hardness however, of the bolt that is

Sorry, didn't realise that you had posted a pic of the actual puller. It's not exactly rocket science to make or buy a suitable copy of that, now is it?

I'm not entirely sure about the suitability of a truck wheel bolt for the job; please correct me if you know better, but aren't wheel bolts standard 8.8 hardness?

I'd want a 12.9 HT bolt for that application.

fatboy wrote:I had a puller made, 22mm x 1.25, perfect fit...

Is that the same puller whose thread pitch you were complaining about earlier in the thread. If so, then M22 x 1.25 is a fine thread...

I was complaing that the set of 10 flywheel pullers I borrowed were all fine pitch thread, which is what I expected to find, but found out the actual thread size/pitch is 22mm x1.25.
Google images show 4 pics of pullers, one of which will NOT fit a Falc as it is 1. pitch, as is the DAF wheel nut stud.
The grade of steel needed is at least case hardened mild steel, you would need to speak to someone with greater metalurigic wisdom ( to mine ) to work out the best material is for a puller, I have proven untreated mild steel is not man enough
Repeat 22mm x 1,25 is the correct size for a Falco, other Italian bikes need different thread pitches
IMO, when buying fasteners, fine pitch starts at 0.5 and ends at 1.0.
1.25 and 1.5 are relative to fastener size, just what I have been told when parting with my cash