Large nut in center of top triple tree is there a torque setting? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 18 (permalink) Old 04-22-2011, 01:34 AM Thread Starter
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Large nut in center of top triple tree is there a torque setting?

Ok I try and explain what I am trying to say.

The large chrome nut in the centre of the top triple for the steering head stem is there a torque pressure setting for that.

About two weeks ago I took my Speedmaster to my local dealer and asked if he could tighten up the steering head bearings because the bike has a bit of a front wheel wobble around 75kph with my hands off the bars on decel.

It only took him about ten minutes to do the job, it looks like he may of just over tighten this large nut which put pressure on the steering head bearing which made the bike weave from side to side with my hands off the bars and not to good to ride.

I just came home from my mates house and we worked on my bike, to loosen this nut we had to use a breaker bar and a lot of force on the socket wrench to move it.

Ok my mate had a torque wrench and we did tighten the nut to 68psi and now the bike feels a lot better to ride and does not weave from side to side anymore.

So is there a torque setting, have we done it right, before with the bike sitting on the jack the forks did not fall to the left and right without been pushed a bit but now we lossen this nut they seem to fall ok not to fast but they do fall by themselves.

Ok I hope you can understand what I am trying to say, I just felt that the dealer did overtighten this nut and like I said it seemed then to follow all the lines in the road, but now it feels better so have my mate and myself have done the right thing cheers.

Last edited by Oz Rogue; 04-22-2011 at 03:46 AM.
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post #2 of 18 (permalink) Old 04-22-2011, 02:04 AM
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The torque setting for the headstock top nut on the Daytona 955i is 65nm. Just a guess, but it should be about the same.
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post #3 of 18 (permalink) Old 04-22-2011, 02:23 AM
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Lets hope the dealer followed the correct procedure and used the factory special tools to tighten the steering head bearings.

The whole thing is quite complicated, involving two special spanners part number 3880140-T0301, a 3/8" drive torque wrench and a correct sequence of torquing, undoing, checking for play, torquing again, etc. It's all in the manual.

The "only took ten minutes" statement looks a bit suspect to me...

On the subject of the top triple clamp nut torque you can't assume anything either. For example: the America, Speedmaster Bonneville, SE and T100 are tightened to a torque of 65Nm (47 Lbs/ft), but for some reason, on the Thruxton it has to be done up to 90Nm (66 Lbs/ft).



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post #4 of 18 (permalink) Old 04-22-2011, 03:03 AM
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I use a 36mm cycle spanner (HCW-15 32/36mm) from the Park Tool Range for the steering stem nut. A very nicely manufactured and quality tool.
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post #5 of 18 (permalink) Old 04-22-2011, 03:31 AM
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Quote:
Originally Posted by teologie View Post
I use a 36mm cycle spanner (HCW-15 32/36mm) from the Park Tool Range for the steering stem nut. A very nicely manufactured and quality tool.
Not bad idea, those spanners are nice and flat, but note the Factory one has an 3/8" square hole to attach the torque wrench and apply the correct pre-load to the bearings.
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post #6 of 18 (permalink) Old 04-22-2011, 03:43 AM Thread Starter
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Thanks for your replies, I think the nut is for the steering stem the one I am talking about it is the large chrome one in the center of the top triple tree on the Speedmaster.

Like I said in my first post the dealer had tighten it up so hard that we had to use a breaker bar on the end of the socket wrench to loosen it there was a lot more than 65Nm so no wonder my bike weaved from side to side and followed on the lines in the road.
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post #7 of 18 (permalink) Old 04-22-2011, 03:48 AM
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On the '02 955i Daytona, once the steering stem nut is adjusted (tightened to 40nm to pre-load the bearing, then backed off and re-tightened by hand until all free play is eliminated) the headstock is replaced (together with a smear of copper grease on the adjuster nut). The 36mm spanner is then used simply to counter-hold the adjuster nut to prevent it from turning while the headstock top nut is carefully tightened to the correct torque setting. Later Daytona 955i's have a locknut and tab washer arrangement on the adjuster nut which is finally torqued to 15nm and the locknut to 40nm. In this arrangement there is no need to counter-hold the adjuster nut when tightening the headstock top nut which (strangely) is torqued to 90nm.
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post #8 of 18 (permalink) Old 04-22-2011, 03:51 AM
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Quote:
Originally Posted by Oz Rogue View Post
I think the nut is for the steering stem the one I am talking about it is the large chrome one in the center of the top triple tree on the Speedmaster.
Correct. This is the headstock top nut.
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post #9 of 18 (permalink) Old 04-22-2011, 04:41 AM Thread Starter
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Thanks everyone for your replies, yes I got it wrong it is the headstock nut I am talking about the large chrome one on top and in the center of the top triple tree and not the lock nut for the head bearings.

Anyway thanks again for the infomation you have given me I now know the right torque settings for this nut which will be fixed tommorrow.

Just a word of warning here don't always trust your dealership workshop when I thought that my head bearings may of been loose there fix was to torque this nut up to 150Nm plus it's a long way of the recommended 65Nm hopefully no damage has been done to the head bearings I only got it done last week and since then the bike has never ridden right.

Last edited by Oz Rogue; 04-23-2011 at 01:00 AM.
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post #10 of 18 (permalink) Old 04-22-2011, 03:16 PM
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Oz Rogue, the steering head bearings are adjusted from under the triple tree, not by tightening the top nut. It may be that the dealer overtightened the top nut and loaded up the bearings, even so you should be using the lower nut to get the correct adjustment on the bearings, not the top one.

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