So, requiring the diff to slip excessively due to mismatched or unevenly worn tires, or by higher power throughputs (WRX, H6 and GT Lib) for example, will result in centre diff failure. The cooked fluid becomes over viscous and causes the diff to "lock" when it gets up to heat (like RX25SE says). They can last as little as 100,00km or go way past 250,000km, depending on how hard they have worked. Once the silicone viscous fluid gets above a particular temperature the fluid is cooked and the diff requires replacement. I may pop the caps and take 5-10 cc out to see what impact that has. With 439cc in each leg, its a little too stiff-and I have the pre-load nearly all the way backed out. The old Kilowatts (heat) equals torque (N.m) times rotational velocity (rad/sec). This year, I experimented and went with the Ohlins 03313 23cst, which is 1 cst higher than the stock recommended Shell Advance 7.5. The viscous coupling creates heat when it slips. Amsoil European Car Formula 5W-30 Improved ESP Synthetic Motor Oil. Amsoil Signature Series 5W-30 Synthetic Motor Oil. The gear oil in the gearbox and the silicone viscous fluid in the centre diff are segregated and are not shared - not common. I did some more research and have narrowed my selection to the following choices. With Maxima’s 5wt and 3wt you can use our ShockBoost 2.5 wt because the viscosity at 40 and 100 degrees celsius and the Viscosity Index are similar. Not saying what due to my embarrassment, but put it down to "school fees". For example, if you’re using a 15 wt (weight) Rockshox oil you’d want to use our ShockBoost 20 wt oil because the Viscosity at 40 and 100 degrees celsius are similar to each other. It failed basically because of something stupid I did. I replaced the centre diff in No.2 Son's MY09 2.5i manual wagon. However all viscous diffs will fail if they are pushed beyond a point. There is not really a problem with the 5MT centre Viscous Differentials, the 5MT model was simply used as an example. LandRovers and VW Caravelles seem to be candidates for home rebuilding. There are some videos on youtube regarding home workshop rebuilding/refluiding generic viscous couplings. You would also need to size and obtain new X-Ring seals IIRC the smallest lot was 1 USGallon at about USD $100 It can be readily air freighted as the fluid is not on any hazardous material list. Here is an American supplier that has an appropriate 100,000 cSt fluid. I was unable to find a supply source of the silicone fluid in Australia.ĭow Corning have a suitable 100,000cSt silicone fluid in their product range, however it is not stocked in Australia. Viscosity Index Classification.(15 min) Oil mist, mineral 35 mg/m No data available Distillates (petroleum), hydro No data available No data available. Icky is the best description I can give it. Once the viscous coupling diff has failed the fluid inside is very icky. I have disassembled a standard 5MT Centre Diff. Jet A JF1107 was tested as a range scan from -20☌ to -55☌ with 1☌ steps. Therefore typically viscosity of JET A is higher and JET A also shows a steeper increase of viscosity with decreasing temperatures. The fluid inside it is a 100,000 cSt silicone fluid (or there abouts) The fuels differ in their freeze point specifications (-40 ☌ for JET A and -47 ☌ for Jet A1).
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