The drive link to my (QUOTA) Speedometer/Odometer fell off; Is loctite a better way to prevent to happen again?

[p6x]

The plastic screw cap that connects the angled gear of my Quota Speedometer/Odometer came undone yesterday as I was riding.

I took this photo prior to sending both instruments to Casa di Moto in Germany, for rejuvenation fixing the jerky Tachometer.

I saw the worm screw clamp, but did not mess with it. I sent it as is, so it could be checked by Casa di Moto.

Should I use mild loctite to prevent it to unscrew itself again? or the garden hose clamp the ultimate solution?

[audiomick]

1 hour ago, p6x said:

The plastic screw cap...

Should I use mild loctite to prevent it to unscrew itself again?

I'm pretty sure loctite only works between metal surfaces. The data sheet here appears to confirm that.

From the product description

Quote

 The product cures when confined in the
absence of air between close fitting metal surfaces

 

https://www.farnell.com/datasheets/24239.pdf

 

EDIT PS: further evidence that loctite doesn't cure against plastic is that the cap on the bottle never gets glued on like, for instance, the one on the super glue tube does.

Edited 22 hours ago by audiomick

[Lucky Phil]

4 hours ago, p6x said:

The plastic screw cap that connects the angled gear of my Quota Speedometer/Odometer came undone yesterday as I was riding.

I took this photo prior to sending both instruments to Casa di Moto in Germany, for rejuvenation fixing the jerky Tachometer.

I saw the worm screw clamp, but did not mess with it. I sent it as is, so it could be checked by Casa di Moto.

Should I use mild loctite to prevent it to unscrew itself again? or the garden hose clamp the ultimate solution?

Not in a million years. If that retaining nut is working loose all the time then there is an issue with the threads on the nut. It shouldn't need any thread locker at all. Your set up looks a bit of a lash up with the screw clamp, obviously not standard.

Phil

[p6x]

1 hour ago, Lucky Phil said:

Not in a million years. If that retaining nut is working loose all the time then there is an issue with the threads on the nut. It shouldn't need any thread locker at all. Your set up looks a bit of a lash up with the screw clamp, obviously not standard.

Phil

 

I reinstalled it, and I tightened it by hand. Its a very fine thread, not sure how it could come loose in the first place. But I did not check it when the instruments came back from Germany.

 

[p6x]

[gstallons]

You said you did not check this when it came back from the service center? We have no way to know if it was tight or not? Get it about as snug as you would reseal a 2 liter soda. Put a dob of yellow paint pencil on it and run it a while and see what happens. I can't see what the hose clamp is doing so I can't comment on it. 

Edited 17 hours ago by gstallons

[audiomick]

9 minutes ago, gstallons said:

--- Put a dob of yellow paint pencil on it and run it a while and see what happens.---

Very good idea.

[PJPR01]

Instead of loctite, you could use a very very small amount of Blue Hylomar on the thread, would provide enough "stickiness" w/o creating a locking situation.  I couldn't imagine how it would spin off by itself unless it was well enough loose, or the Quota is like a paint shaker and vibrates like hell.  Seems unlikely though.

Edited 16 hours ago by PJPR01

[Pressureangle]

I would check the nut on the gearbox carefully to see if it's split. If so, you could use a clamp or perhaps a sturdy zip tie to tighten it on the thread after assembly. If not, a few wraps of teflon tape should tighten the threads up enough to keep it in place. 

[p6x]

12 hours ago, gstallons said:

You said you did not check this when it came back from the service center? We have no way to know if it was tight or not? Get it about as snug as you would reseal a 2 liter soda. Put a dob of yellow paint pencil on it and run it a while and see what happens. I can't see what the hose clamp is doing so I can't comment on it. 

As you see in the first photo, this is how it was sent. Disconnected item 9 from the angle gear 8. The angle gear was left connected to the instrument. But this was my fault as I did not check how tight it was when I got it back.

There is no visual access to the actual angle gear/instrument connection. You need to remove dashboard plate item 1 on the drawing to be able to access or examine the connection. Only the item 9 connector is accessible and visible.

The hose clamp were tightened around the screwable caps. Since those caps are made of plastic, the hose clamp would put pressure on the cap preventing it from turning. Those clamps were there already. I do not know if one of the previous owner experienced a similar issue.

Something else;

Noticed on the drawing item 3 and 4?

Item 4 is a nilstop nut;

Item 3 is not properly represented. There are 3 rubber washers, one spacer. I installed two of the rubber washers above and below the spacer, and one directly between the fairing and the fairing mount which is not shown in this drawing. There is no detail of how it should be installed.

[p6x]

12 hours ago, audiomick said:

Very good idea.

But you can't check if it moves unless you take apart the dashboard support, which is neither quick or easy.

[p6x]

11 hours ago, PJPR01 said:

Instead of loctite, you could use a very very small amount of Blue Hylomar on the thread, would provide enough "stickiness" w/o creating a locking situation.  I couldn't imagine how it would spin off by itself unless it was well enough loose, or the Quota is like a paint shaker and vibrates like hell.  Seems unlikely though.

I am hoping it came off because it had been removed and loosely screwed back. That being said, these hose clamps maybe an indication they are prone to unscrewing themselves.

 

 

[p6x]

11 hours ago, Pressureangle said:

I would check the nut on the gearbox carefully to see if it's split. If so, you could use a clamp or perhaps a sturdy zip tie to tighten it on the thread after assembly. If not, a few wraps of teflon tape should tighten the threads up enough to keep it in place. 

I checked that it was not split, it did not appear to be. I thought about that too. As said above, it was probably not screwed properly when it came back.