10 replies to this topic

[gaspen]

Hello

 

I still don't know what is happening here. I have an issue with the selector forks position : they just not concentric with the main shaft. Now I have 3 set (or pair) and I can't get a usable "mixture". 

 

The forks on the end of the rods do not allow a good aligment because they lie on each other.

 

The factory tolerance was so poor or I'm just not fortuante enough ?

 

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[Spider]

1 / 2 looks OK, 3 / 4 looks miles out from what I can see in your pic.

 

Either the Fork is wrong, the dimple in the Shift Rod is in the wrong place, or both.

 

Just as a check here, if you remove the locating screw from the Fork (allowing it to float), does the Main Shaft then 'seat' OK in them ?

[imack]

On mine it was the NOS fork that was drilled incorrectly. The worn original fork and the minispares fork fitted to the selector rod perfectly.

[gaspen]

1 / 2 looks OK, 3 / 4 looks miles out from what I can see in your pic.

 

Either the Fork is wrong, the dimple in the Shift Rod is in the wrong place, or both.

 

Just as a check here, if you remove the locating screw from the Fork (allowing it to float), does the Main Shaft then 'seat' OK in them ?

 

Yes, without fixing the forks on the rod the main shaft sits fine.

 

Additionally if I put on only one synro hub the shaft will rotate freely  >>>  https://photos.app.g...1MM5jjhZt3GcK2A

 

When I put on BOTH syncro the shaft becomes tight because the mis-alignment.

 

 

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I marked the position of a god fork on the rod, you can see how "off" it is

 

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Yesterday I found a good-looking pair  but the 1/2 fork is very close to the wear limit (0,38mm) and I am not so happy with that.

 

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[gaspen]

On mine it was the NOS fork that was drilled incorrectly. The worn original fork and the minispares fork fitted to the selector rod perfectly.

 

Yes, you I read your answer in my welding topic :) To be honest I am hesitating to spend more money on the forks.

[Spider]

Yesterday I found a good-looking pair  but the 1/2 fork is very close to the wear limit (0,38mm) and I am not so happy with that.

 

 

You don't need to replace them as a pair, I seldom do. If from that 'good looking pair' the 3/4 fork is OK, fit that and your NOS 1/2.

[gaspen]

 

Yesterday I found a good-looking pair  but the 1/2 fork is very close to the wear limit (0,38mm) and I am not so happy with that.

 

 

You don't need to replace them as a pair, I seldom do. If from that 'good looking pair' the 3/4 fork is OK, fit that and your NOS 1/2.

 

 

When I say "good-looking pair" I mean a good combination from the 6 pieces I have 

 

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After lots of puzzling I found a good pair, dont ask me how as I tried every combination many times. Good news that these two forks have the less clearance at the hub.  3/4 is almost 0.00 and 1/2 is around 0.1-0.15 mm

 

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[Spider]

That looks better !

[gaspen]

Another question 

 

The english casted 3/4 fork has some vertical grooves. I guess this is for allow the oil and particles to flow down. I do believe that for the same reason the 1/2 fork has only 2-2 contact surfaces and the gap beetween them. Spanish forks don't have these grooves. 

 

Is it a good idea to reproduce those grooves ? I have the tools to make but I don't know if I will get any gain. The car won't be a daily but a weekend cruiser 850 

 

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[Spider]

Given they are essentially a thrust washer that only sees intermittent use and their already small contact area, I'd suggest leaving them as they are for longer life.

[gaspen]

Given they are essentially a thrust washer that only sees intermittent use and their already small contact area, I'd suggest leaving them as they are for longer life.

 

You saved me some hours  Thanks