Thursday, June 20, 2019
TRUNNION REPAIR
The trunnion/fork fit should be within .001" but mine was .015" on one side and was way too loose. The fork needed to be trued and the trunnion had to be turned and have a sleeve fitted. Fork truing was an easy milling machine job using a boring head.
The trunnion was held in the lathe and turned down. I found that this had already been done once before. As I was turning the surface down I found this.
I finished turning this down and then machined a sleeve to fit.
Usually the sleeve is soft soldered to the trunnion but I chose to use LocTite bearing mount. It looks like the previous job was done that way and had no problems. Here you can see the outer race for the roller bearing. It looked like it should be replaced as you can see.
Here is the finished product. I also plan to add a Fork Reinforcement of some sort.
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The inboard tie-rod mountings can be a problem. The holes in the front frame tend to crack. Many years ago I brazed an inverted "U" of 1/4" rod around the top and that fixed it. Sometimes the rods break and it is a good idea to carry a spare and at least one nut and washer. When it goes you lose the nut and the broken end. Slackening the tie-rod off helps slider installation. I'm GBC, not franshukriya!
ReplyDeleteMost people reinforce the tie bar between the forks. The standard item tends to loosen and the back wheel leans. Make a "U" shaped piece by welding steel strips to the existing tie-bar and secure with bolts in the holes you will find in the fork arms about 6" behind the tie bar. You can also do it by machining a 1/2" hole in a piece of say 1" bar and welding to that. Then use a length of HT 1/2" bar with threaded ends to hold it all together. Morgans probably used shims with a 1/2" hole to set the spacing of the corks. You seldom see them. The holes mentioned above are believed to be there so you can poke a pencil through to help you set the rear wheel alignment...There is lots of folklore like this. If I could work your sign in thing I would not be anonymous!
ReplyDeleteThanks GBC. I always appreciate and learn from the comments made.
ReplyDeleteFred