Diff Pinion Bearing Preload

[Huw]

Need some wisdom from those who might have done this before.

I want to measure the drive pinion bearing preload on an R200 diff I have.

Problem is I don’t have a torque wrench with a low enough range to do this properly. The FSM says the bearings preload is between 11 to 17 kg-cm or 9.5 to 14.8 in-lbs in old money.

Is there another way to measure this? I was thinking of a luggage weight gauge ( as I have one) pulling some string wrapped around the drive flange. That should give me the force to start the pinion turning, a bit of maths and I should be good.

But I don’t know how accurate it would be. Anyone done this before????

Huw

 

[jonbills]

When I did mine, I think my research concluded it was not far off the limit of what you can turn with just your thumb and forefinger. I can't find the information that lead me to that though, so may be wrong!

 

[Pete]

Need some wisdom from those who might have done this before.

I want to measure the drive pinion bearing preload on an R200 diff I have.

Problem is I don’t have a torque wrench with a low enough range to do this properly. The FSM says the bearings preload is between 11 to 17 kg-cm or 9.5 to 14.8 in-lbs in old money.

Is there another way to measure this? I was thinking of a luggage weight gauge ( as I have one) pulling some string wrapped around the drive flange. That should give me the force to start the pinion turning, a bit of maths and I should be good.

But I don’t know how accurate it would be. Anyone done this before????

Huw

See the 'steering rack build - the FSM way?' thread. In your case the lever dist is the radius of the flange.

 

[Turn & Burn]

Fix a 30cm rule to it and pull 0.5kg at the end of the rule, or make a weight up on a string off the ruler. As u gently let go of the 0.5kg weight it should start to turn

 

[Huw]

Thanks all. I will have a little play tomorrow.

Fix a 30cm rule to it and pull 0.5kg at the end of the rule, or make a weight up on a string off the ruler. As u gently let go of the 0.5kg weight it should start to turn

I like this idea as a way of verifying the spring gauge method.