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VG080 overhaul

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malinois
Posts: 16

Re: VG080 overhaul

Post#31 » Wed Jul 03, 2019 12:12 pm

cal_w460 wrote:Both the new inner Viton and outer NBR seal rings are double lip design. Meaning that there will now be four(!) lips sealing each shaft.

image.jpeg


Viton is OEM and NBR is corteco?
Is there aftermarket for Viton?

dcurbet
Posts: 2979

Re: VG080 overhaul

Post#32 » Wed Jul 03, 2019 5:10 pm

Viton is a brand.

Here is a good short read:

http://www.rg-group.com/blogs/buna-seal ... rth-money/

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malinois
Posts: 16

Re: VG080 overhaul

Post#33 » Thu Jul 04, 2019 12:53 am

Yes i know
But somewhy moustly original seals come made from Viton material.
so for A0209975747 aftermarket is Corteco 01034085B (NBR material)
but for A0209975647 is there some aftermarket? (Viton material)

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cal_w460
Posts: 1811

Re: VG080 overhaul

Post#34 » Thu Jul 04, 2019 4:00 am

The outer NBR seals have an aftermarket replacement from Corteco. See my pictures.

The inner Viton / flour carbon seals don't have a replacement and the OEM ones are NLA from MB. The outer diameter should be OD=57,15 mm wich is non standard. However OD=58,15mm is a standard dimension with the same ID and width as OEM.

I bought Viton radial seals and removed 0,50 mm of material on the outer perimeter in a lathe. There was enough material to take from. The rest of the dimensions were exactly like OEM. I made some extra ones (two complete sets), but they are sold to G friends now.

You can do this carefully with the seal ring mounted on a large socket using a cordless drill and a piece of emerald paper aswell. :)

The seals in my box were very stiff. I think they age well during 30 years because of the high temperatures that the TC reaches under 4x4 load (>110-120 dgr. C).
w460.333 1982 Colorado Beige 300 GD OM617.931

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cal_w460
Posts: 1811

Re: VG080 overhaul

Post#35 » Thu Jul 18, 2019 11:08 pm

I checked the older MB Service Manual for the transfer case, it has different information regarding the heating of the flanges. According to this manual you should heat the flanges to 120 dgr. C, and not more than 240 dgr. Celsius. In that case it will be much easier to get them on without using a press. Just push them onto the shaft until they barely touch the outer seal ring. Let it cool down and tighten the nut to 200Nm.

VG080_Flanges_Heating.JPG
w460.333 1982 Colorado Beige 300 GD OM617.931

Baddy
Posts: 498

Re: VG080 overhaul

Post#36 » Fri Jul 19, 2019 1:55 am

I followed that procedure from the old manual when replacing 6 bolt flanges for 8 bolt flanges on my spare TC. found that around 165 degr. C (heated with a heat gun and measured with a cheap Chinese IC thermometer) was a sweet spot and the flanges would just slide on...

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cal_w460
Posts: 1811

Re: VG080 overhaul

Post#37 » Fri Jul 19, 2019 11:36 am

Good to know. Will try that on my last flange. Rear output flange requires alot of disassembly when pressed on with hydraulic press. To support the shaft.

I guess Gelandes figure of 160 dgr. C from memory was correct aswell.
These flanges needs a bit more heating than the manual says (120 dgr. c) to get fully seated.
w460.333 1982 Colorado Beige 300 GD OM617.931

dcurbet
Posts: 2979

Re: VG080 overhaul

Post#38 » Fri Jul 19, 2019 7:33 pm

should a similar heating state be applied to the flange on the rear of the trans when replacing that?

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vadimivanovich
Posts: 7764

Re: VG080 overhaul

Post#39 » Sat Jul 20, 2019 9:38 am

No. The transmission flange will slide on/off easily.
"The way you think is the way you live"

dcurbet
Posts: 2979

Re: VG080 overhaul

Post#40 » Mon Jul 29, 2019 4:47 pm

Thx Vadim.

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