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Drive Shaft To Prop Shaft Linkage

Differential

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8 replies to this topic

#1 Paul94

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Posted 07 August 2012 - 12:41 PM

Another simple question from someone without an automotive entering background....

Having installed both rear drive shafts, I can understand why they can (almost) independently rotate. This is the main purpose of the differential and allows one wheel to move at a different speed to the other so you can go around corners. What I didn't expect was that turning the prop shaft did not turn the drive shafts. It rotated freely and seemingly had no effect on the drive shafts. I was expecting some sort of direct linkage.
Is this normal, or do I have a problem with the diff?
Paul94


#2 agent_zed

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Posted 07 August 2012 - 02:08 PM

if you have both wheels on the floor and push it forward and back the prop should turn!

If you have one wheel off the floor and you turn the prop then the wheel off the ground should turn.

If it don't then something ain't right?!

hth

#3 RichardL

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Posted 07 August 2012 - 02:52 PM

FYI - this is one of the best ways to understand a diff (short of playing with lego versions), its worth 10 minutes of anyones time, especially the second half:



Nothing to add to previous response - prop shaft turning should turn at least one of the drive shafts (if up in the air) are they pushed all the way home so the splines are engaged?
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#4 Grim

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Posted 07 August 2012 - 04:00 PM

did the diff and shafts come as one? is it physically possible to put a small shaft in a larger hole? (open question)

#5 snotfart

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Posted 07 August 2012 - 07:20 PM

great film,thanks for posting.
if experience,skill and ingenuity fail
try brute force and ignorance
you never know it might just work

http://s914.photobuc...ac342/snotfart/

#6 zoomzoom

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Posted 07 August 2012 - 07:53 PM

Turning the prop should turn at least 1 of the drive shafts, check the drive shafts are fully inserted
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#7 Paul94

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Posted 08 August 2012 - 06:55 AM

Thanks for the U tube clip Richard. I watched it and a couple of others that the nice U tube browser suggested for me. I think I now have a basic understanding of how a diff works. Isn't it satisfying to learn new things. Regarding my problem: I found that the near side drive shaft was not fully engaged Doh!!
Thanks all for you helpful suggestions.
Paul94

#8 agent_zed

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Posted 08 August 2012 - 09:13 PM

glad it was a simple fix. diffs still boggle my mind. i understand the principles but if i try and follow it round in my head it just doesn't make sense :crazy:

#9 Simon B

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Posted 09 August 2012 - 10:48 PM

Diffs I can understand. It's the automatic geaboxes and overdrives that are tricky :)

Even LSDs I find a bit hard ...

It amazes me how anyone thought these up in the first place :)

Simon.
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