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MG TD TF 1500 - wheel & Pinion Gear clearance

When I drive my 1953 TD everything runs fine and there is no special noise to hear. If I go downhill then there is a noise I believe it is coming from the Rear Axle Differential.
Checking the differential I found a clearance between Prop shaft and Axle Shaft that means between crown Wheel and Pinion.
My question to the experts is: Is it possible to reduce the clearance between Crown and pinion by changing the pinion adjusting washer #22? I believe yes it should be possible.
Next Question is; Is it possible to change the washer without removal of the whole axle? How can I remove the Bearings and the pinion?
Anybody knows this Problem and found an easy solution?
Thank you, Guenter


GK Guenter

Guenter,
I think you are mixing things up. You wrote "Checking the differential I found a clearance between Prop shaft and Axle Shaft that means between crown Wheel and Pinion." The thickness of the pinion head washer in the differential has nothing to do with the prop shaft. To change such a pinion washer requires special tooling and special know-how.

Regards
Declan
Declan Burns

Guenter,
Read through this and you will see what I mean-it's the bible.
http://billavista.com/tech/Articles/Gear_Setup_Bible/index.html
Regards
Declan
Declan Burns

Guenter
basically, no you can't do it from the outside, it all needs to come apart so that tooth markings etc can be checked

The slackness you can feel between the prop shaft and axle shafts could be quite normal depending on how much movement there is--there will always be movement between the sidegear and axle splines and also between the sidegears and planetry gears, which will increase as the thrust washers on these gears wear
It would be unusual for it to need a new/different pinion adjusting shim as hopefully the thing would have been set up properly originally and this washer doesn't wear
There is always the possability that the pinion flange nut has loosened off---if that is the cause there will be detectable up/down movement at the pinion flange

What sort of noise is it making, a whine or a rattly clunky noise and at what speed
William Revit

Hello Guenter. The washer you are asking about is used to set the distance of the pinion head to the center of rotation of the crown wheel. This distance is 2.377". Not easy with out factory tooling, but can be done. The backlash between the gear teeth should be set at .008. This is done by adjusting or changing the carrier bearing spacers. You measure the backlash between the gears by picking up a crown wheel tooth thru the oil drain hole while the diff is assembled with a dial indicator while reaching down thru the axle tube and rotating the crown wheel assembly back and forth. If you have other questions drop me a line. I've done about 100 diffs.

Butch
R Taras

Thank you all for advises and recommendations.
I believe my description and my nomination of parts was wrong and lead to misunderstanding.
What I mean is, if I drive downhills without giving acceleration there is a noise like a (grrrr) and I have no idea where it is coming from.
I lift up the car to inspect the underside of the car. I found nothing special. If I take the prop shaft with my hand I found a clearance. I can move or better turn the shaft about 1/4 inch.
My Idea was very simple but may be wrong. The Crown and Pinion wheel are a bevel gear set and if I bring the pinion closer to the center of Crown wheel the clearance should be smaller. Right or complete wrong?
GK Guenter

Hello Guenter
Not sure the clearance is abnormal. Of course the free play between crown wheel and pinion can be reduced. Not the way you propose but according to Butch way.
Pinion must always be centerd on the gears of the CW to maximize the area of contact.

Is a too large play responsible for the classic whining noise of the axle ? I'll let the experts answer.
But a too small play may destroy the gears.
Prefer to have a larger one : no danger.

Laurent.

LC Laurent31

Hi Guenter. The gears are not bevel gears, they are hypoid. Bevel gears only have one tooth engaged at a time between the pinion and the ring gear, where hypoid gears have more than one. Bevel gears are generally set on the center of rotation of the matching gear. Hypoid gears are set(in this case) below the center of rotation of matching gear. The TD/TF, MGA and early MGB diff's all have the same offset.

Butch
R Taras

Hi Guenther,

are you sure its not the gearbox ? Mine makes all sorts of funny noises in various gears and different load conditions.

Rgds, Mike
Mike Fritsch


Mike, I have a Ford 5 Speed gear box installed according Hi Gear Engineering installation set. It runs very well without noise.
Cheers, Guenter


GK Guenter

This thread was discussed between 11/07/2019 and 12/07/2019

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