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1Back to top Go down    loose nut on final drive on Thu Dec 12, 2013 2:05 pm

Johnser

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Hi again,

Just lubing my final drive splines as I had the wheel off for a tyre change.

When I got the final drive off, a tablespoon of oil fell out of the shaft/FD.

Strange, I thought, as the area was dry when I lubed the splines in the spring. and no signs of leaking oil when parked or around the drivetrain.

However, on inspection, the nut that winds onto the FD splines was loose!

So my questions are:
-Why might the nut come loose? too harsh a downchanges?
-Is that likely to be the cause of the leak? or from somewhere further up towards the 'box..?
-I take it there's a seal in there too somewhere.... replace it before I torque the nut back up, or whack it back together and see how it goes?
-use some kind of locking device/locktite to try to keep the nut in place?

Any opinions/experiences gratefully received!

    

2Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 3:04 pm

mike d


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It's not unusual to find a drop of oil, but if it gets worse you may need to replace the input pinion oil seal (it sits in a threaded ring). How does the drive feel? Perhaps the input bearing is worn?

That nut should be at 200Nm!

Mike

    

3Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 3:06 pm

MikeP

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@Johnser wrote:

However, on inspection, the nut that winds onto the FD splines was loose!


Do you mean item #1 in this?


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1992 K1
1993 K1100R (used to be an LT)
    

4Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 3:34 pm

Johnser

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Thanks for the replies,

Yea, #1 in the diagram. Thanks for that pic - most helpful

I will double check in a bit, but the brief examination I gave it showed no signs of a worn bearing, couldn't feel any in/out play, roughness or side to side movement.

The moly-grease that had been flung off of the splines from the previous lube had not been dissolved by the puddle of gear oil, I'm hoping this suggests it might be a fairly new issue and I havn't caused too much unnecessary wear on the pinion/crown.

I take it #4 is the seal so it shouldn't be a huge hassle to replace it so long as I can get #3 out.

    

5Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 4:04 pm

mike d


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Yep, #4 is the seal. There is a tool for the threaded ring...........

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6Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 4:17 pm

sidecar paul

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Hi Johnser,
Here's a simple tool forlocking the bevel box while you try to reach 200Nm!

http://www.k100-forum.com/t3247-simple-bevel-box-locking-tool

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!
    

7Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 5:53 pm

Johnser

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Heh, thanks. That tool would've been perfect!

I was scratching my head about how to hold it and in the end put the wheel on, held the square end of the casing in a vice and clamped chocks onto the disk to butt up against the brake mounting holes. With a further brace bar lodged between the wheel spokes it was just about possible to get the torque up to 200Nm.

Very heath robinson and I kind of wish I'd seen that first.

So yea, I decided to whack it back together and see what happens.

cheers!



Last edited by Johnser on Thu Dec 12, 2013 6:07 pm; edited 1 time in total

    

8Back to top Go down    Re: loose nut on final drive on Thu Dec 12, 2013 5:59 pm

sidecar paul

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Good for you. Where there's a will, there's a way.cheers

Paul.

(Reminded me of a MAD magazine quote "Where's there's a will, there's relatives!)


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!
    

9Back to top Go down    Re: loose nut on final drive on Fri Dec 13, 2013 4:35 am

charlie99

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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

10Back to top Go down    Re: loose nut on final drive on Fri Dec 13, 2013 4:38 am

charlie99

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@sidecar paul wrote:Hi Johnser,
Here's a simple tool forlocking the bevel box while you try to reach 200Nm!

http://www.k100-forum.com/t3247-simple-bevel-box-locking-tool

Paul.

and a great idea paul

made one just last week....hoping I can borrow caferacers "ring release tool" one day for the unlocking of the pinion ...

cheers


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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