pinion seal

[450sl]

Today i replaced the pinion seal .

Torqueing slotted nut and old sleeve  with 200Nm resulted in a frozen bearing.
So dissasembled , found old crushing sleeve to be 15,42mm , replaced with new Mb sleeve of 15,92mm again 200Nm no crushing of sleeve.

At over 300Nm sleeve began to crush a bit but not enough , so measured remaining axial play of 0.17mm , machined down the sleeve , refitted with 200Nm,

Result no axial play ,good bearing frictioncoefficient.

But still feel a bit puzzled ; any  thoughts on this one ??
 

Mark

[stickandrudderman]

The purpose of the crush sleeve is to set the bearing clearance by crushing the sleeve until correct clearance is achieved. The force required to crush the sleeve is much greater than any force that might be exerted on it in normal use for obvious reasons.
A torque wrench is not required but one has to be careful not to go beyond the point where clearance is reduced to below spec as then you have to disassemble and start again with a new sleeve.

[450sl]

Thanks Stick , Clear , then i just took a different route with same results.

So routine should be:

Apply new crush-sleeve , use GREATER force then the BBB specified 200 Nm ,to crush the sleeve, in order to obtain no play at a low (26-30 cmkp) rolling resistance of the bearings.
Apply old  crush sleeve , use 200Nm , then check rolling resistance of bearings for overtightening.

Only added that new bearings take a different rolling resistance  than the 26-30 cmkp for used bearings.


Thanks
Mark

[doitwright]

Stick and Mark,

Could you identify the crush washer in either of these diagrams?

Thanks.

[450sl]

top picture no 43

[Shvegel]

You'll notice the new crush sleeve has a different design than the old one.  They are straighter with less of a bulge than the old ones.  The new ones are much harder to crush than the originals.  You are correct in the idea that you just turn it regardless of torque until you get the proper rolling resistance on the bearings.  It takes so much force to crush the new sleeves that I have taken to using a clamp to hold the socket into the grooved nut so it won't slip off.

[450sl]

Just to be on the safe side I used this product as sealant for the boot ;

[George Des]

I went through this once before a long time back. If I remember correctly you can only get at the crush sleeve by completely dismantling the rear end and removing the pinion. A royal PITA as I recall. Am I recalling this correctly or have you found a way to remove and replace the crush sleeve without a complete disassembly?

[450sl]

its easily removed once flange is off..

[Shvegel]

George, 
You are correct.  450Sl pulled the rear axle apart.  If you were really pushing it you MIGHT be able to weld a tab on the forward bearing and slide hammer it out but the risks are too much for me.

[Wselogy]

hello. where can locate the slotted wrench for the pinion nut? i need to change my differential seal. any other pointers would be appreciated. thank you

[450sl]

Sorry cant help you with that : i have made one myself.

BTW : a large sergeant to keep the wrench in place would also come handy.

[Wselogy]

Thank you. ill make one also