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Differential operation question.

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Differential operation question.
#1
gawn74 Avatar
gawn74 Silver Member Rob Wendt
Harvest, AL, USA   USA
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1972 MG MGB
1978 MG MGB
Checking the truing of the spoked '72 rear wheels, the B is on jack stands. With motor running, I put it in 1st gear and checked how the wheel looked while rotating. Oddly enough, the right side seems to be moving slower than the driver side. Hmm. I found I could hold the passenger side wheel still with a gloved hand, while the driver side continued to turn just fine. I know unlike posi-traction cars, a regular differential can provide power unequally to the two drive wheels, but this bit seems wierd to me. I wonder if being raised with no resistance could this really be okay, or is something really wrong? Anyone know how the differential really works?
Thanks again to all on this forum, who are amazing.

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Re: Differential operation question.
#2
cschaefer Avatar
cschaefer Silver Member Chuck Schaefer
West Chicago, IL, USA   USA
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1969 MG MGB GT
Perfectly normal operation for an open diff.

Here is a very basic video on how it works.


video]?t=208[/video]

Unfortunately the "start at" doesn't work here. Fast forward to 3:28



Edited 1 time(s). Last edit at 2024-04-12 11:26 AM by cschaefer.

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Re: Differential operation question.
#3
gawn74 Avatar
gawn74 Silver Member Rob Wendt
Harvest, AL, USA   USA
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1972 MG MGB
1978 MG MGB
Thank you so much, Chuck. Your "perfectly normal" is a huge relief to me. Now, back to the wheel truing.
Thanks,
Rob

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Re: Differential operation question.
#4
GTgeezer Avatar
GTgeezer Lynn Kirkpatrick
Columbia City, IN, USA   USA
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1968 MG MGB GT
How far "out" are your wheels? meaning side-to-side "wobble" and radial "hop". Small amounts will not be noticeable +/- 1/8" Is it in the tires (wear?) or rims?
But if you really need to correct more, you need special equipment, or find one of the few shops that does. These are very stiff rims and adjusting spoke tension will not do it.


The important thing is not to get ahead, but to get along.

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Re: Differential operation question.
#5
ClayJ Avatar
ClayJ Silver Member Clay Johnston
Mt. Olive, MS, USA   USA
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1972 MG MGB
Also, running the drive train on stands can provide a host of odd noises, that's normal as well.

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Re: Differential operation question.
#6
John37 Avatar
John37 John M
Abingdon, Oxfordshire, UK   GBR
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1978 MG MGB GT
In reply to # 4784251 by ClayJ Also, running the drive train on stands can provide a host of odd noises, that's normal as well.

Many unusual things come as standard on an MG. Over time, they breed and the number of unusual things increases exponentially. Some of them are not good. It's good to strip parts of the car every so often to remove the bad unusual things and keep the number in check.


John
1978 MGB GT UK spec

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Re: Differential operation question.
#7
oleanderjoe Avatar
oleanderjoe Platinum AdvertiserAdvertiser Joseph Baba
Fresno, CA, USA   USA
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1962 Triumph Spitfire 4 (MkI) "SPITTY"
This is NORMAL> There are soome VERY good videos online explaining its function.
A lotT is happening in there in regard to rotation, gears, and mechanical force. VERY ingenious device. Do a little reading, it is fascinating how it works. Have fun.

In reply to # 4784113 by gawn74 Checking the truing of the spoked '72 rear wheels, the B is on jack stands. With motor running, I put it in 1st gear and checked how the wheel looked while rotating. Oddly enough, the right side seems to be moving slower than the driver side. Hmm. I found I could hold the passenger side wheel still with a gloved hand, while the driver side continued to turn just fine. I know unlike posi-traction cars, a regular differential can provide power unequally to the two drive wheels, but this bit seems wierd to me. I wonder if being raised with no resistance could this really be okay, or is something really wrong? Anyone know how the differential really works?
Thanks again to all on this forum, who are amazing.


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