Hello, I've spent a decent amount of time digging around here and w124performance.com for case preload and backlash specs for a rear diff I'm installing a quaife LSD on. I've found a document titled diff_rebuild_FSM.pdf which seems to mostly refer to factory LSD and ASD models. There are specs listed for vertical and lateral run out (0.02mm) and I assume these are Mercedes speak for case backlash and case preload but I'm not positive. A point in the right direction is appreciated - I have a lot of experience rebuilding VW 5 and 6 speed manuals so maybe its just the terminology thats throwing me off.
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034 Rear Diff Overhaul Specs
- Thread starter shearerbeard
- Start date
The document mentioned above is primarily for replacing the clutch pack on factory LSD/ASD, it does not have the info for the ring gear carrier R&R.
Use the FSM document for the other specs you need, job # 35-550. That should have everything you need. Here's a link:
Note that you will need to use a spring clip to retain the axles (p/n should be mentioned in an old post somewhere on this forum), once the stub axle flange is tapped into place, a slide hammer is needed to remove it from the Quaife. If you adjust the stub axle end play with different shims you may need to R&R a few times.
Use the FSM document for the other specs you need, job # 35-550. That should have everything you need. Here's a link:
Note that you will need to use a spring clip to retain the axles (p/n should be mentioned in an old post somewhere on this forum), once the stub axle flange is tapped into place, a slide hammer is needed to remove it from the Quaife. If you adjust the stub axle end play with different shims you may need to R&R a few times.
I do not recognize those clips and I'm not certain if they will work well. Test-fit the axles into the Quaife before final assembly and verify you can remove them. Photo at this link show the correct clip from Mercedes that has been verified to work, scroll down to the photos named "clips_xxx".
ZERO machining required!!
Thx again - a dealership just a state away has them in stock so I ordered up 6.
Hi @gsxr
In the FSM document you posted above:
There is a mention on p.748 of the prescribed frictional torque for the pinion bearings which is referenced in a table that is unfortunately not part of the pdf.
Do you happen to know it or have the table?
I am attempting my first diff rebuild or refresh on a large case '97 sl500 and not able to find definite values for those, as well as the minimum and maximum initial torque values for the collar nut for that specific diff.
Thanks
Krum
In the FSM document you posted above:
There is a mention on p.748 of the prescribed frictional torque for the pinion bearings which is referenced in a table that is unfortunately not part of the pdf.
Do you happen to know it or have the table?
I am attempting my first diff rebuild or refresh on a large case '97 sl500 and not able to find definite values for those, as well as the minimum and maximum initial torque values for the collar nut for that specific diff.
Thanks
Krum
Krum, the table is on page 5 of the PDF linked above (printed page #730). Note the spec is much, much lower for "used" bearings.
None of these specs apply for your reinforced, 1.4L-case 1997 SL500 diff. See if there's specs in the WIS for the reinforced differential.
None of these specs apply for your reinforced, 1.4L-case 1997 SL500 diff. See if there's specs in the WIS for the reinforced differential.
thanks i must have missed that table, yes i will be replacing all the bearings and the crush sleeve.
You are indeed correct, I thought the w124.036 diff is the same as the one on the SL500 but now that I checked both the housing numbers are different as well as is the ratio. So most probably they changed the diffs with the introduction of the 5 speed tranny on the SLs.
I will need to look further at the specific values for the diff in the SL.
You are indeed correct, I thought the w124.036 diff is the same as the one on the SL500 but now that I checked both the housing numbers are different as well as is the ratio. So most probably they changed the diffs with the introduction of the 5 speed tranny on the SLs.
I will need to look further at the specific values for the diff in the SL.
The reinforced diff with 1.4L case shares almost nothing with the earlier diffs. It's a completely different design internally. This diff was introduced on all 5.0L and 6.0L engines in the 140 chassis from start of production, and 129 as of .067/.076 chassis. The older 129.066 used the same non-reinforced diff as the 500E).
6-cyl engines and the baby 4.2L V8 never got the reinforced diff, AFAIK.
6-cyl engines and the baby 4.2L V8 never got the reinforced diff, AFAIK.
What I was able to find in wis specifically for the reinforced 210mm version is the tightening torque of the pinion nut, interesting thing is that the value is very specific and not a minimum one as the other versions:
What i could not find is specific info on the frictional torque, seems to be shared with the smaller case versions:
What i could not find is specific info on the frictional torque, seems to be shared with the smaller case versions:
Found the specific values for the reinforced diff:
It also appears that this diff has two 12 point nuts on the pinion, an outer which is visible, and an inner one that sits behind the seal and on which the friction torque is set on. Then the final torque is done on the outer one. No idea how i am going to undo/tighten the inner one as pinion shaft is too long at this stage and no socket will reach the nut.
It also appears that this diff has two 12 point nuts on the pinion, an outer which is visible, and an inner one that sits behind the seal and on which the friction torque is set on. Then the final torque is done on the outer one. No idea how i am going to undo/tighten the inner one as pinion shaft is too long at this stage and no socket will reach the nut.
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