4speed trans sprocket

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jimd60491
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4speed trans sprocket

#1

Post by jimd60491 »

how do you lock the sprocket so it doesnt spin.when taking it off. are the treads reverse ? the trans is out of the bike too
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Re: 4speed trans sprocket

#2

Post by Panacea »

Jim, You can read thru the "disassembling Main Drive Gear (Fig. 4D-14)" in the Panhead service manual. Page 166, bottom left corner. If you don't have a manual you can find it in the Documentation area listed in the orange heading above...Mike
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Re: 4speed trans sprocket

#3

Post by flatboy1950 »

Take the lid off , engage two gears at once , everything locks up ... loosen the sprocket nut.
I use an old trans mount plate with a chunk of square bar welded to it ... tight in the vise , trans bolted down to plate.

Flatboy.
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Re: 4speed trans sprocket

#4

Post by Cotten »

Jim!

This works in the chassis, too:
SPKTTORQ.jpg
The socket is the hard part:
SPRKTTUL.jpg
It is the only way to torque the main drive gear assembly for checking endplay with an empty box, or for proper fitting of the main drive bushing on a lathe or hone.

....Cotten
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Re: 4speed trans sprocket

#5

Post by Huck »

Love the home built tools!
jimd60491
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Re: 4speed trans sprocket

#6

Post by jimd60491 »

will a regular chain wrench work.?
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Re: 4speed trans sprocket

#7

Post by Cotten »

Jim!

Does it have a #50 chain, and a really, really long handle?
You don't want the sprocket teeth to sit on anything but a proper chain, and the bar is what stabilizes it on the bench, or the floor when in the chassis..
And you want to be able to reverse it.

....Cotten
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Re: 4speed trans sprocket

#8

Post by Hauula Pan »

I simply wrapped an old chain around mine clamped the ends tight in my vise so it couldn't move & had no problem getting the nut off & back on. Yes, the threads are reverse. "ie" Left hand.
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Re: 4speed trans sprocket

#9

Post by old.wrench »

Although some folks may feel it's taboo, there is always the option of grabbing the sprocket with a glove and socking the nut with an impact wrench . . . . "for removal only". You don't want that impact wrench anywhere near when you are assembling.

Geo.
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Re: 4speed trans sprocket

#10

Post by Cotten »

Geo!

"For removal only" is a helluva caveat.

If you take it apart and cannot put it back together correctly, it's broken.


....Cotten
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Re: 4speed trans sprocket

#11

Post by Panacea »

According to the torque chart in the KB, The sprocket nut gets 120-150 ft-lb.
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Re: 4speed trans sprocket

#12

Post by Hog54 »

I take them off and put them on with an air impact wrench.35 years now and never had a problem.You just have to know what your doing.:)
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Re: 4speed trans sprocket

#13

Post by RUBONE »

According to the torque chart in the KB, The sprocket nut gets 120-150 ft-lb.
That is the torque for the clutch center to mainshaft. The tranny sprocket nut is much less. It will likely strip at that amount, or fracture the teeth on the main drive gear. I have replaced plenty where guys got carried away tightening the sprocket nut and ruined the gear, nut, or both.
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Re: 4speed trans sprocket

#14

Post by Cotten »

Hog54 wrote:I take them off and put them on with an air impact wrench.35 years now and never had a problem.You just have to know what your doing.:)
Hog54!

You remind me of the common mantra of my barroom pool-playing days"
"Better to be lucky than good."

....Cotten
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Re: 4speed trans sprocket

#15

Post by Panacea »

RUBONE wrote:
According to the torque chart in the KB, The sprocket nut gets 120-150 ft-lb.
That is the torque for the clutch center to mainshaft. The tranny sprocket nut is much less. It will likely strip at that amount, or fracture the teeth on the main drive gear. I have replaced plenty where guys got carried away tightening the sprocket nut and ruined the gear, nut, or both.
I went back to find the chart for a double check but it seems to be gone now, strange...
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