Re: [DML] Second gear fork pin questions...

["Michael Paine" <mpaine@xxxxxxxxxxxxxxxx>]

Here is my understanding of how the 1st/2nd shift 
fork/rod/sliding hub work after seeing it when I replaced 
MY sheared off roll pin...


The fork slides onto the shift rod there is a "roll pin" 
on either side of the fork to keep it from sliding along 
the shaft when you shift. The fork has 2 arms that are 
round - like a 1/2 circle that the sliding gear sits in... 
the shift rod goes through a hole in the side of the fork 
to push and pull the sliding gear when you move the shift 
rod by shifting. If there were no pins the fork/hub would 
sit still and the rod would slide forward and back through 
it's mounting hole. 

Now that you understand how the forks move, if you shear 
off a pin then one way it will move the fork and the other 
way it will slide around a bit.

I believe mine was bent when I got the car and once when 
my clutch slave had leaked all fluid out I had a very hard 
time shifting to 2nd and from that day on it never acted 
the same - I believe it sheared off. I since replaced the 
pin and all transmission seals.

The pins don't always shear off smooth and there is 
usually a bit of the pin that "snags" on the fork and it 
does in fact shift. Mind you there is a spring on one side 
of the fork so as it slides through, the spring is 
compressed and as it gets more compressed it eventually 
overcomes the resistance of the transmission and it pushed 
the fork and the sliding hub to the next position.

If you look at the diagram @ 
http://www.usadmc.com/dmcstore/ViewDir.asp?PageID=50&PageCat=4%2DTransmission

Michael
vin# 6067


On Sun, 04 Sep 2005 08:27:45 +0000
  "alex morgan" <mauibarber@xxxxxxxxxxx> wrote:
>Aloha,
>About a month ago I wrote describing the problem I was 
>having with second 
>gear popping out of gear every so often.  I was told by 
>Rob that it was 
>probably a sheared pin on the second gear fork.  I have a 
>couple more 
>questions about what the fork and pin do and what the 1-2 
>slider gear does.
>
>I notice that every so often when shifting from first to 
>second that second 
>gear feels stiff and clunky.  Even before I let out the 
>clutch.  All other 
>gears feel smooth.  And 2nd can sometimes feel smooth. 
> But I would say 50 
>percent of the time second feels crunchy.  98 percent of 
>the time it goes 
>into 2nd gear with no grinding.  I can punch the gas and 
>accelerate quickly 
>through the gears with no grinding too.  When I try to 
>get it to grind the 
>only way I can do it is to go into first and very quickly 
>and with VERY VERY 
>low RPM's (sub 1500) shift to second.
>
>My question is does the second gear fork pin only keep 
>the car from popping 
>out of gear or can it also make the shifting NOT smooth? 
>  And is there a 
>telltale sign of a 1-2 slider gear problems vs other 
>second gear problems?
>
>-Alex
>
>
>
>
>
>
>
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