MGExp

MG Midget Forum

How much play in rear end?

Moss Motors
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

J76midget Avatar
J76midget Gold Member 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

nonracer 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
J76midget Gold Member 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.

. Hide banner ads & support this website by becoming a > Supporting Member <
Kerr Avatar
Kerr Platinum Member 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
J76midget Gold Member 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
Kerr Platinum Member 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
J76midget Gold Member 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

. Hide banner ads & support this website by becoming a > Supporting Member <
kirks-auto Platinum Member Robert Kirk
Davenport, Iowa, USA   usa
U joints tight?



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail for quote/questions/orders

Business phone 563 323 1017
Orders only please 800 547 5747
cell, if I have it, 563 940 1864

http://kirks-auto.com/
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.


Member Services:
Parts for your classic British and Italian car. 30 years in business.
J76midget Avatar
J76midget Gold Member 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

. Hide banner ads & support this website by becoming a > Supporting Member <

To add your reply, or post your own questions

Members Sign In   or   Create an Account

Registration is FREE and takes less than a minute!


Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster