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reversing gear

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geoff walker 118/08/2019 14:18:32
323 forum posts
140 photos

Hi All.

I found this diagram on the internet. I'm NOT 100% sure but I think the reversing gear below is for a stuart 10v.20190818_132532.jpg

OK, the pivot pin 5 passes through a hole in the bracket 4.

On one end of the pin is attached the lever 2 and the other end the linkage 1.

By releasing the knurled lock nut 11 you can raise or lower the lever to move sideways "the "part with slot in" 1, to select either forward or reverse rotation of the engine.

As I see it for this mechanism to work 1 and 2 must be rigidly fixed to the pivot pin while the pin is free to pivot in the bracket hole 4?

Assuming I'm correct how are 1 and 2 secured on the pivot pin?

Geoff

malcolm wright 118/08/2019 14:46:31
4 forum posts

I believe 1 and 2 are pinned onto the piovot which is free to rotate in bracket item 4.

If ypu check out Kieth Appleton on you tube he has a video on ST reversing gear.

geoff walker 118/08/2019 15:06:32
323 forum posts
140 photos

Hi Malcolm,

Thank you, I forgot about Keith Appleton, good video.

Thanks again

Geoff

JasonB18/08/2019 15:43:09
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1 is not fixed to the pivot.

Lever 2 and the arm 3 form a rigid bellcrank pivoting around pin 5 so as the lever goes up and down the expansion link 1 moves sideways.

On the Double 10 the pivot 5 takes the form of a rod along the length of the engine so one lever 2 will move two arms, one at either end of the engine

Edited By JasonB on 18/08/2019 15:47:43

Clive Brown 118/08/2019 15:49:14
266 forum posts
7 photos

The lifting link between the bellcrank and the expansion link seems to be omitted from the LH diagram.

JasonB18/08/2019 16:26:41
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Lifting links are there, one on each side. They are round ended.

lifting links.jpg

Edited By JasonB on 18/08/2019 16:28:02

Clive Brown 118/08/2019 16:47:56
266 forum posts
7 photos
Posted by JasonB on 18/08/2019 16:26:41:

Lifting links are there, one on each side. They are round ended.

Ah,sorry quite correct. I'm with it now.

geoff walker 118/08/2019 17:27:13
323 forum posts
140 photos

Hi Jason,

Thanks for your reply.

I was mistaken, as you say, it's 2 and 3 which are rigid and form the bell crank.

With such small parts, I believe the pivot pin is 3/16" diameter, is there a taper pin and taper reamer small enough to pin the parts together? If not I imagine you would use small carpenters moulding pins?

Geoff

JasonB18/08/2019 17:36:49
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At 3/16" the small end of a 1/16" taper pin will do fine.  As it's such a small engine you could just drill a plain hole say 1.2 or 1.4mm and turn a parallel pin that can be stuck in with a small drop of Loctite. These taper pinsare 1/16" pins through an 5/32" rod.

Edit

I don't know how much metal you have in the lever and arm bosses but on the larger Stuart No1 reverser they show the taper pin part way through the rod and not through the middle like my photo above. This also does the job and retains some strength in the rod much like this cross head pin I did a while ago.

Edited By JasonB on 18/08/2019 17:50:23

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