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nixzy

Preloading centre bearing?

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Hi all, I just bought a new rubber hanger and centre bearing for my mk3 cortina’s driveshaft and the guy I bought it off said that I should preload the bearing by bolting the hanger to the car with a 6mm spacer on the diff end then take the spacer out then bolt to the diff, my workshop manual doesn’t specify this, should I do

it?

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I've always just fitted them back together & drove off.

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Same here,just fit back on :thumbsup:

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Thanks, I thought as much. Wanted to make sure I wasn’t missing something

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I've been thinking about this,i wonder if the advice of setting the bearing hanger forward is based on the assumption that the car is lifted with the rear axle hanging,eg stands under the body and not under the axle casing ,or even hanging on a two post lift.

In this scenario with the axle fully hanging ,the prop shaft assy will move forward when the full weight of the car is back on the suspension putting a load on the centre bearing if the hanger was not spaced forward,this would not happen if the axle was on the stands.

This would not be a 'preload',but pre-set in anticipation of the shaft moving forward when retuned to normal ride height.

 

Alternatively , could a slight preload at normal ride height be beneficial in firming  up the hold the rubber has on the bearing ,as they do 'wobble' around a bit ,even new ones ,but i guess if that was the case it would be mentioned in the manuals.

Any thoughts or theories guys ?

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As said I've fitted loads & never heard of this it's not mentioned in any literature in factory manuals for MK3/4/5/P100.

Or escort,Capri,etc.

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