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How much play in rear end?

Posted by J76midget 
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J76midget Avatar
Jay Laros
Hayes,, Virginia, USA   usa
1976 MG Midget "Midge"

So let me rephrase the question. What is a reasonable amount of play in the rear end when you rotate the drive shaft? Obviously, not a whole lot is good, but would like to have some advise.

thanks,

jay

Steve Codianni
AZ, USA   usa

Backlash on a ring & pinion is about .008 but thats hard to measure using driveshaft movement. If you were to make a mark at the 12:00 position how far can you turn the driveshaft? 1:00? 2:00?

J76midget Avatar
Jay Laros
Hayes,, Virginia, USA   usa
1976 MG Midget "Midge"

Steve,

It rotates about 1/4 inch or less. Maybe approaching the 1:00 position, but not by much. Is this in the "acceptable" range?



Edited 1 time(s). Last edit at 2011-09-11 05:11 PM by J76midget.

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Kerr Avatar
Norm Kerr
Ann Arbor, MI, USA   usa

Trying to judge pinion free play on the car can be misleading because holding the tire and rotating the pinion will show you several free-plays combined: wire wheel play (if you've got wire wheels), half shaft spline wear/play and pinion/crown wheel play. Measuring the play of a diff on the bench is the accurate way, with a dial indicator. The spec for what that ring and pinion play should be, is engraved on the back of the gear (each matched set will have a matching set number, and the crown wheel play for that matched set, and the amount of shim offset to the right or left, all engraved on the back of the crown wheel).

A 0.005 freeplay at the ring and pinion will feel like almost 1/4" at the pinion flange.


Norm

J76midget Avatar
Jay Laros
Hayes,, Virginia, USA   usa
1976 MG Midget "Midge"

Thanks Norm,

I'll move on the the other repairs at this time and come back to it. Without pulling it (not in the current plan) it sounds like I'm not in too bad shape. Correct me if I'm interpreting your response incorrectly.

jay

Kerr Avatar
Norm Kerr
Ann Arbor, MI, USA   usa

the easiest way to diagnose a rear end is to drive and listen for noise

if it is not making noise, then it is most probably just fine

a diff that has been put together incorrectly might be quiet for a while, a few thousand miles, and then it will gradually get louder and louder


If yours has not been touched in a long time, and it is not noisy, then I'd say that your amount of play is likely just fine.


Norm

J76midget Avatar
Jay Laros
Hayes,, Virginia, USA   usa
1976 MG Midget "Midge"

Thanks Norm,

It isn't making any noise, just started in the rear in my repair order and when checking noticed the amount of play. Moving on to the next major step.

jay

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Robert Kirk
Davenport, Iowa, USA   usa

U joints tight?



Regards,
Robert Kirk
kirkbrit@yahoo.com
563 323 1017
Moss distributor UK importer
Beat or match any retail/delivered quote



Edited 1 time(s). Last edit at 2011-09-12 07:08 AM by kirks-auto.


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J76midget Avatar
Jay Laros
Hayes,, Virginia, USA   usa
1976 MG Midget "Midge"

Robert,

First thing I checked, they are new two/three years ago but you never know. They were tight, hence I moved on to the rear end. The play is the only noted issue, no noise, etc.

thanks,

jay

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