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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Gearbox end play
Having rebuilt the engine and gearbox ( 4 speed 711.2 ) on my 300GD I discovered that there is an end float of about 1mm on the output flange. This seems to big for me but I never checked it before I rebuilt it. I checked the nut on the flange and all is well there. I have an old 4 speed W123 gearbox and it also has this apparent large end float. Cannot find a spec for this.
Peter |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| RE: Gearbox end play
I'm pretty sure it's defined in one of the manuals I have. I think I've looked it up for someone before. I'll try and remember to have a look tonight. FWIW, the three iron box five speeds I have on the garage floor right now are all dead solid at the output flange, no discernable play either axially or radially. I haven't put the dial indicator on them yet. -Dave G. |
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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| RE: Gearbox end play
Thanks Dave
Was having a good look at EPC and I see on the 711.1 gearbox there are various thickness washers ( item #86). The 711.2 does no have any listed. Something I guess has worn , either speedo drive gear or thrustwasher ( #110 was measured as 4.00 mm before fitting ) or hub itself.
Peter |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| RE: Gearbox end play.. Greg S??? PGreen???
If I remember correctly I think it was a fellow who went by "PGREEN" on the BWF list (maybe this one too) who originally had me look into it. I'm not sure, but Greg S on this list from Nova Scotia might also have looked into this. I have a couple different manuals at home I can check into and get back with you. -Dave G. PS - does the 711.2 use shims between the rear housing and the main case instead of the washers of the 711.1? Just some vague momories coming back, not sure if they're applicable.
Edited by hipine 3/26/2007 5:40 PM
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| RE: Gearbox end play
Here's the skinny, Peter. There's only a couple places that end play will come from. One is from the bearing (#113 on the EPC plate 545) being worn out - meaing axial play of the inner race in relation to the outer. Another is if the bearing's outer race has axial play in the transmission housing. That last is controlled by various thicknesses of snap ring (#116 on same plate) and how the snap ring forms a "sandwich" between the trans case and the main shaft rear retaining plate (#119 on same plate). The spec for main shaft end play is 0.00 - 0.05 mm per transmission manual 26.61 covering 711.200, 711.202,and 711.101 All the best, -Dave G. |
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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Re: Gearbox end play
Dave G and others watching
Did some more work - firstly measured the end play - 0.50 mm . Then I placed washer between flange and "speedo drive gear ". Still no luck - then took end cover off and had a good look.
The snap ring I had in there was 1.6mm . This I chose because the depth of the retaining plate was 1.6mm however the snap ring groove is 2.0mm wide resulting in the mainshaft floating about by 0.5mm ( I assume 0.1mm float in the bearing itself. I find it strange that the retaining plate is 1.6 mm. I actually checked that with another gearbox ( from W123 - retaining plate is the same ) that I one was also 1.6 mm. What I am going to have to do is do some keyhole surgery and remove the end main bearing and replace snap ring with one of 2.0 mm . This will still have the desired end float of 0 - 0.05 mm ( as per manual ) mover the end plate will no sit properly flush with transmission housing.
Another thing - its stange that the manual I have covering this gearbox ( paragraph 26.61 250/7 ) mentions that shims of 0.1, 0.2 and 0.3 mm are available yet you look on EPC and there is no such part.
Peter |
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