Right after doing less than a hundred mile's and having no pervious experience of kit car's let alone a BEC my prop let go of my gearbox at
70 MPH.
The prop adapter has minimal damage just some very light scratches but the engine is toast.I have been left with the adapter and some kind of washer
inside it and not knowing how it was attached obviously screwed to the output shaft,how is it screwed in with what type of bolt and is it torqued in
with the washer what's still there?
I have the engine out and have another one on the way and don't want to be replacing it because of the prop letting go again.
Sorry if it's a daft question
Sorry to hear that, must have been quite frightening when it happened but glad you seem to be ok, while it's all out are you planning on fitting
a prop catcher, maybe worth a think about. How much damage has it caused, tunnel/wiring/fuel lines??
Take care
Rich
thank's for the concern. 
It seem to miss the fuel line and any wiring but it did bash the front of the transmission tunnel at the front driver's side but most of the
damage was done when it droped to the passenger side and ripped the the water pump clean off.
Also i did think after getting the engine out to get my brother to make up (fabricate) some type of harness to catch the prop if it ever let go again
as i have since heard a few horror stories of prop's letting go.
There is usually a flat washer behind the large nut,splined to lock on the output shaft, then the edges of the washer are
pried up into a flat to lock the nut (I did this all the way around the nut).
There was also a large washer plate on the output shaft, how it stayed on i don't know.
I just need to know how to do it correctly to stop it happening again as i don't want to bolt it up for it to go all wrong again.The car was
factory built and this is all still a learning process.Taking the engine out was'nt to much of a problem it's just this little thing that
i'm gonna be a little anxious about when driving the car when i put all together again.
So what exactly failed, or happened. The big nut backed off, or the small bolts backed out?
I am waiting on my kit from MK, and I have seen a few BEC guys talk about this. Has anyone tried using safety stainless steel wire as a backup.
It was the big bolt that came loose wish i knew then to check it, but i'm still to determin what kind of bolt was in there.
Surely if it was a factory built car and sold new to you the onus is on the manufacturer to put the damage straight.
As said generaly a splined washer with a tab. put adapter on the gearbox output shaft put washer on splined shaft apply loctite tighten nut up to
specified torque then bend tab on washer up onto flat on nut, I then stake the end of the output shaft.
As I said if it was a new car it would be going back to them
tony
My adaptor nut is the same as 40inches. It is quite a long affair though, so much so that I cut a little bit off. The prop itself has a dished end and the nut when secure now butts up to the prop face meaning it can't go anywhere unless the 6 or 8 so prop bolts all let go first. Maybe a longer nut would suit you?
quote:
Originally posted by mistergrumpy
My adaptor nut is the same as 40inches. It is quite a long affair though, so much so that I cut a little bit off. The prop itself has a dished end and the nut when secure now butts up to the prop face meaning it can't go anywhere unless the 6 or 8 so prop bolts all let go first. Maybe a longer nut would suit you?
Mine just uses the same nut and splined washer that was holding the sprocket onto the engine ( zx10r ), as mentioned above bend the washer around the flat edges of the nut, i also put some locktight on the threads for good measure.
I seem to remember someone (Procomp?) saying that the adaptor SHOULD be loose on the shaft!
Found one post, seems it was Andy Bates Linky
[Edited on 31-3-11 by 40inches]
i had that exact problem that andy mentions there. bolt tight to the adaptor and the washer dishing resulting in a loose prop and lots of vibration at
cadwell. luckily happended in the last 5 minutes of the day.
had a little removed from the shim that was behind the adoptor and hasn't happended since.
My car was built in 2007 but since then it has had a few owner's and i don't blame anyone else especialy Toniq.It was my own fault as i have
now learned that you you should regularly inspect that the prop is'nt going to work it's self loose.
All the parts i need seem to still be there apart from the large bolt that hold's it on and it look's like i will have to try and source
one.Does the bolt have to be the specific one to the adapter kit or is it the one that originaly hold's the sproket when it the engine was still
in a bike?
When you say bolt, you mean an actual bolt the screws INto the shaft? On my engine its a nut that screws ONto the shaft. Granted I have a Hayabusa, just trying to make sure I can envision what happened.