Jump to content

Shortening the 72 cardan drive


Eastwest
 Share

Recommended Posts

Hi. If i instsll the Dnepr gear box into mt M72 i am told i need to shorten the drive shaft by 20mm.

 

Question. What is the best way to go about this and is there any pitfalls.

 

Rgards

 

Mark

Link to comment
Share on other sites

Easiest is to use a M-63, M-66 or early K-750 driveshaft as they are the right length. Probably hard to find though. Otherwise cut the shaft at the spline end, bore a hole into the spline end about 20 mm, turn down the shaft for 18/19mm (to take account of the material lost in the cut. You want a very tight fit. TIG weld the join. You can do the same thing at the yoke end. There's more metal there so you can arc weld it and grind it down. In both cases you want it welded by someone that knows what they are doing. I've seen photos of Russian shafts lengthened for choppers and they grind the shaft ends to a point and run a series of welds to slightly oversize and grind to standard diameter.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...