It's very good that you pass on this kind of information.
Magnus Karlsson
www.concourshealeys.com
17 feb 2012 kl. 23:35 skrev Andrew Thorp <bce257@yahoo.co.nz>:
> Just a little note on my experience with repro sychro cones for a BN4
> transmission.
>
> The first lot I got from AH4H looked to be well made so I
> dutifully assembled the transmission with them. A quick test on the dyno
stand
> showed they have almost no baulking action at all so I stripped down the
trans
> again to find out why. The issue is the lack of care when machining the
> braking face which mates to the cone shape on the gear.
>
> Pic one is the AH4H
> supplied synchro after lapping it on the gear for about half an hour then
> colouring it black with a permanent marker pen and rubbing it a few times
on
> the mating gear.
>
> Pic two is a 'Welch' CGBS140 synchro after the marker pen
> treatment but with no lapping.
>
> Pic three is the original 55 year old cone.
> You can plainly see the differences- the cheapy replacement ones have very
> little contact area (light colour = contact) due to poor machining when
> compared to the original and properly made reproduction. They are going
> straight back to AH4H
>
> Conclusion: avoid reproduction synchro cones like the
> plague unless they are properly made. If you are about to assemble a
gearbox
> with repro cones, colour in the brake face and see how much contact it
makes
> with the mating gear.
>
> Andy.
> http://homepages.slingshot.co.nz/~bce257/images/DSC07474.JPG
> http://homepages.slingshot.co.nz/~bce257/images/DSC07477.JPG
> http://homepages.slingshot.co.nz/~bce257/images/DSC07471.JPG
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