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Speed Triple Forum Rants and ravings about the best naked triple on the planet!

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Old 11-28-2010, 09:23 AM   #1 (permalink)
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Steering head bearing adjustments

Hi Guys,
Winter maintenance time

With the bike on the jack minus the front wheel, lower the jack all the way down and sit in front of the forks. Grab a fork in each hand and tug forward and back. If you feel movement in the forks (and it's not the entire bike moving) the bearings are too loose. If not, you're solid!

I have front forks suspended and their is some play in the bearings.

Therefore:

Advice time:

The Haynes Manual apparently says "Note: Two thin 38mm spanners are required (Triumph Part No. 3880140-T0301) which have an offset square cut into them to accept a torque wrench." So I guess 38MM & thin will work times 2. The picture just shows the distance to the square drive to be enough to clear the head of the torque wrench. That way it will be as close to bearing centerline as possible for the proper torque reading. Maybe 1 1/2 or 2 inches. The nuts look to be 1/4 inch thick or less. It also says the adjuster nut preload torque is 40NM & then the lock nut torque is also 40 NM

I have tried to source these spanners from my triumph dealer and they are 40 each, as I need two I approached someone to make them for me, quote 15 for two. he will flog them on ebay afterwards.

Can some one who has been there, done that and has the t-shirt confirm I need these tools before I start stripping in.


Thanks for you help guys, if anyone is in Essex / London area and want to a loan of these once I am done we can have a communal swop!

Triumph tool data (see photo)
It's 3/8" thick, 8" long, 2.5" wide, & there's 1/2" distance to the torque wrench hole.
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Steering head bearing adjustments-triumph-tool.jpg   Steering head bearing adjustments-screen-capture.jpg   Steering head bearing adjustments-screen-capture-1.jpg   Steering head bearing adjustments-screen-capture-2.jpg  
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File Type: pdf Head bearing adjust.pdf (260.1 KB, 253 views)
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Old 11-28-2010, 09:32 AM   #2 (permalink)
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I have always used socket T3880024 as per 1050 service manual instructions. Jack Lilley has them listed, in case you need one. Should not be too difficult to anglegrind one out of a suitable sixed pipe/socket either. Using the socket you will need to remove top triple clamp for adjustment.

The nut on a 1050 is of the crown type, so I wonder if the hexagonal spanner on your pic will work? Might be that the spanners you are talking about still worked for 955s?

Also worth noting that the 40Nm torque for bearing nut is the preload torque only, you are supposed to back off the nut afterwards and then do the final torque, which if I remember right is more in the ballpark of 15Nm.

Last edited by Martin_R; 11-28-2010 at 09:39 AM.
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Old 11-29-2010, 04:11 AM   #3 (permalink)
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mrjsrbond

I suggest you check the head bearing before you get the spanners made - the 900s used 2 x very thin spanners - but my 2007/8 speed triple has a castle nut under the top yoke. The book may be wrong?

Jon
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Old 11-18-2012, 10:55 AM   #4 (permalink)
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I realise it was a long time ago but I have just got round to removing my head bearings.

You where correct, it needed a castle nut and I had one made by my local machine shop from some dims I found on the net.

The threads where quite corroded so it was hard work getting the two lock rings off.

I wanted to ask, the top bearing seems fine, should I leave it and just re-grease.
The bottom one was really corroded, will post pics. It read SF0849PX1 NTN.

I tried to measure it but finding it hard. Research shows Decosse referenced two sizes

For the later bikes ( mine is 282931, a late 2006)
30 x 55 x 17, 32006 Bearing

Can anyone point me in the right direction.

Cheers
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Old 11-18-2012, 11:20 AM   #5 (permalink)
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Steering head bearing adjustments-imageuploadedbymo-free1353255641.749120.jpg


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Old 11-18-2012, 02:26 PM   #6 (permalink)
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Top bearing does not change size on the S3, only on the later Sprints.

Top bearing is 25x52x15; bottom is 30x55x17

If replacing them, would suggest tapered roller for both top & bottom

http://simplybearings.co.uk/shop/p43...duct_info.html

http://simplybearings.co.uk/shop/p14...duct_info.html

Unfortunately Triumph has been shown to be really spartan with greasing the Steering Bearings appropriately.
When installing the replacements ensure they are adequately loaded.

Getting the bottom race off the steering stem can be a chore - if you have access to hydraulic press, easiest way is just to press the stem down through both race and bottom triple together and the bearing will pop off.
Take it to a machine shop or similar with some beer money - 2 min job with a press!
Remember to get bearing seals also!
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Old 11-18-2012, 02:45 PM   #7 (permalink)
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Old 12-17-2012, 05:46 AM   #8 (permalink)
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Hi decosse, fellow petrol heads,

Go to order the bearings from simply bearings

Items: SKF 32006XQ metric taper bearing
30x55x17

And

Item
302055JR Narrow metric taper bearing
25x52x15

I need advice on the seals to order. I thought the bearing shop would know but no.

Thanks for your time.
Cheers
Jim
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Old 12-19-2012, 01:38 PM   #9 (permalink)
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I really do need assistance please.


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Old 12-29-2012, 08:46 AM   #10 (permalink)
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Hi folks

Got busy and getting to grips with steering bearings. Steering head bearing adjustments-imageuploadedbymo-free1356788214.271930.jpgSteering head bearing adjustments-imageuploadedbymo-free1356788227.552336.jpgSteering head bearing adjustments-imageuploadedbymo-free1356788243.818268.jpgSteering head bearing adjustments-imageuploadedbymo-free1356788254.921994.jpg

As you can see I have the tapered bearing races installed.
The bottom race is flush, I think it will seat inwards when I torque everything up while the top race projects to form a lip.

Taking off the bottom bearing race was the hardest as I don't have a machine shop nearby.
Anyhow now I am at this stage I can work out what seals I need.
The bottom one which sits on the triple tree is ID30 OD 53 presumably just to stop grease washing out. On a similar project on a piaggio I used ends of bakebean cans but tey where completely covered by fairings!!!

A seal to retain grease for the top bearing is ID42 OD52. Think a depth of about 5mm will work with this space.


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