Crown assembly

mikeydpippin · Post by **mikeydpippin** » Thu Mar 06, 2008 10:18 pm

I notice the thread on the stem of the crown assembly is threadbare for the first 1/4" the adjusting nut is loose until past this distance,so I am going to attempt to tighten the bearings (to get the adjusting nut past this 1/4") and pull the stanchions through the crown with a draw bolt.
Anyone any ideas how to replace the crown stem (if the draw bolt does'nt work)other than weld another stem bar,in it's place.How is the stem connected to the bottom yoke.

Biscuit · Post by **Biscuit** » Thu Mar 06, 2008 10:34 pm

The stem is a TIGHT press fit in the bottom yoke, for safety's sake, get another assembly.Edited by - Biscuit on 06 Mar 2008 10:35:07 PM

mikeydpippin · Post by **mikeydpippin** » Thu Mar 06, 2008 10:48 pm

Would prefer to get another one but any ideas where to look?

Biscuit · Post by **Biscuit** » Thu Mar 06, 2008 11:16 pm

Tony Surbey has a selection of pre-used examples.

01462 811770

g80csp11 · Post by **g80csp11** » Fri Mar 07, 2008 7:05 am

Russell motors had new ones the last time i needed one

mikeydpippin · Post by **mikeydpippin** » Sat Mar 08, 2008 4:55 pm

Waiting for replacement crown,I have been making a drawbolt to pull the forks through the yokes.I have welded an old top nut ground back to the thread (allen key one)to a 1/2" threaded bar and will attempt to pull the stanchions through the yokes with a nut and washer.I will fit the top and bottom yokes first with the bearings in situ.
I am hoping the drawbolt will pull up squarely and the nut will not catch on the top yoke.
I have tried to get a threaded bar with the 1mm pitch thread but no luck.
Any more advise regarding this would be most welcome,Mike

Biscuit · Post by **Biscuit** » Sat Mar 08, 2008 5:16 pm

That's the way to do it. Surely you tried the nut through the top yoke before welding?

mikeydpippin · Post by **mikeydpippin** » Sat Mar 08, 2008 5:52 pm

oooh yes,all looks good.Thanks for your reply Alan,People like me need you and your experience.

itma · Post by **itma** » Sat Mar 08, 2008 6:15 pm

whats the 1mm pitch thread for?

paul knapp · Post by **paul knapp** » Sat Mar 08, 2008 7:41 pm

Wind a suitable diameter of broom handle into the staunchion thread and pull it up high enough for the top nut to get a hold, using the pinch bolt to hold it while you unscrew the 'simple tool'.
Full extended, those springs don't have that much tension.

Paul