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Viscous Center Differential - MY02 5sp

clunk silicon oil shuddering

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#1 RX25SE

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Posted 13 February 2015 - 04:43 PM

Does anyone know what type of silicon oil these diffs use?

 

Subaru lists the entire assembly as a non serviced item, but I have been led to believe that they can be serviced and re-oiled. The one in my 6sp RB supposedly has Toyota oil in it as the factory oil is too heavy and causes binding when it gets old.

 

I have just disassembled and reassembled one (I think it's out of a Foz) that apparently suffered the old 'clunking on slow tight turns' syndrome and it appears to be more than do-able with the correct oil.

 

It's looking like the one in the RX needs doing.

 

 

Interested to hear from anyone who has done this or had it done and can confirm that the RX is actually a VCD and not an open diff.

 

 

Cheers,

 

Jase


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#2 RX25SE

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Posted 14 February 2015 - 08:22 AM

After reading the workshop manual again, all GenIII 5speeds come with a viscous centre diff.


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#3 bobbyjimmy

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Posted 17 February 2015 - 12:27 PM

A bloke here (Tuggeranong Transmissions) repacks them with the Toyota fan clutch silicon oil which you buy in small packs (like 20ml or so).

No idea how many or if you just open it open squeeze it in and it's done or what.


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#4 RX25SE

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Posted 17 February 2015 - 03:59 PM

I'm pretty sure that's what Techworks  (Tuggeranong Transmissions) did with my RB 6sp Luke.

 

As far as I can tell, it's the same problem with the RX.


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#5 duncanm

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Posted 18 February 2015 - 06:16 AM

Its a VW Syncro.. but this may help  http://www.2wd-goes-syncro.de/?p=452
 
By the looks of things:
* the 'silicon oil', in those units at least, is just PDMS (dimethicone) - widely available.
* volume/mass of oil is critical
* this Vanagon rebuild thread is very useful - especially the  VW technical paper linked

#6 RX25SE

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Posted 18 February 2015 - 11:38 AM

Great!
 

Heaps of info.

 

No I just need to work out the volume.......... and learn German!

 

 

Thanks.


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