Fitting Bultaco Sherpa Fork Oil Seals
Posted 02 June 2009 - 06:46 PM
Any advice on fitting the bultaco oil seals would be appreciated especially unscrewing the nut at the bottom of the fork leg.
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Posted 02 June 2009 - 07:35 PM
Its not the fitting of the seals that is a problem - its getting the old ones out! I always gently heat the fork leg around the top oil seals until the residual oil boils then use a fork removing tool (available from http://www.frost.co....e_catalogue.asp or ebay). The top seal comes out easy but be careful removing base seal. If too much pressure is applied the fork ally will split. If it refuses to budge use a dremel with small grinder to cut the metal seal band. Even if a little alloy is removed it is better than a split seal housing. Can be fixed with locktight bearing seal or even some filler. Clean out the swarf!
When replacing the seals lips face to the bottom. Heat the fork leg, lubricate seal and insert one at a time, preferably with a drift.
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Posted 02 June 2009 - 07:40 PM
Try sitting the leg in some penetrating oil overnight, then pour a kettle of boiling water over the area around the securing bolt. I would not recommend using direct heat from a blow lamp etc on the alloy. However the relatively low heat of boiling water being poured over the alloy should allow the alloy to expand slightly, without damage. Likewise when re-fitting new seals heat the top of the lower leg with boiling water then drift the new seal in using a close fitting socket (one with approximately the same external diameter as the internal daimeter on the recess that the seal fits into) and rubber mallet.
Posted 02 June 2009 - 08:43 PM
I used a regular seal puller. If they are extra corroded I'm sure it will be more challenging. I had one set of forks which were just horrid but I don't recall the seals being any problem.
Posted 03 June 2009 - 01:11 PM
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Posted 08 June 2009 - 09:38 AM
Posted 10 January 2014 - 08:47 PM
Just read Bultaco 49's advice on removing fork oil seals.
I did use a dremel to cut the old seals.
I am now sure that the seals that i have just removed were the originals: almost 40 years of service, and really well embedded in the fork ally. So very good advice.
Bultaco Alpina #213
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