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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 01-12-2012, 04:13 PM   #1 (permalink)
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fork seal replacement on 68 bonneville

I have a 1968 Triumph Bonneville that needs new fork seals. What is the procedure to replace them? What all needs to come off and what parts of the front forks can stay in place? Are there any special tools that I will need? Any pictures etc. would be greatly appreciated. Thank you.
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Old 01-12-2012, 04:38 PM   #2 (permalink)
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On both my 79 bonneville and my 80 yamaha, it was easiest to just remove the front wheel, remove the fender, brakes etc. and slide the forks out of the triple trees then remove the seals that way. If you need real detailed instructions I can help a bit, but this is a pretty simple procedure.
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Old 01-12-2012, 06:58 PM   #3 (permalink)
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Off the top of my head:

- remove the front wheel
- drain the forks
- unscrew the lower fork legs from the dust excluders (use the right tool for this! - see attached photo)
- unscrew the bearing nuts
- remove all of the fork bearings
- slide the dust excluders off the bottom of the fork tubes (don't lose the two washers)
- knock out the old seals
- tap in the new seals
- reassemble

When you slide the dust excluders down, the springs, gaiters, and spring abutments will come with them. Don't lose the cork washers on top of the abutments...

I think that covers it. What did I leave out? :-)

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fork seal replacement on 68 bonneville-fork-oil-seal-holder-removal-tool-triumph-1964-70-421-p.jpg  

Last edited by kbalch; 01-12-2012 at 07:06 PM.
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Old 01-12-2012, 07:35 PM   #4 (permalink)
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68 may have been the 1st year of the plastic "dampening sleeve" which is a black plastic sleeve that fits over the fork leg along with the other internals. If you have to remove this for any reason, check for the chamfered end so that you put it back the proper way. Saves a lot of checking and phone calls.........don't as me how I know.

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Old 01-12-2012, 07:37 PM   #5 (permalink)
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Yep, that piece is on the '69, but I wasn't sure about the '68. If it's there, the chamfer goes on the bottom.

Ken
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Old 01-12-2012, 11:27 PM   #6 (permalink)
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1./ Remove the front mudguard.
2./You don't need to drain the oil.Tip it out of the sliders,when you take them off.
3./Leave the wheel in place until you loosen the dust-excluder from the slider.If you don't have the correct tool,screw a hose-clip on the bottom of the excluder and drive the hose-clip with a Stillson-wrench.
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