1993 850 GLT..Sod It!!

I can tell you from experience that running the engine with the transmission fluid line disconnected is the quickest way to ensure you need to replace the whole thing. Recently had this experience with a motorhome (of all things) and the shade-tree mechanic working on it did just that because the fluid inside was burnt black and there was no drain plug in on the transmission.

Long story short once the fluid was drained the system siezed up and that was the end of that.

My 240 has a drain plug on the bottom of the transmission pan...maybe you need to drain, then fill with fresh fluid, then run it, then drain again and refill etc. until you've flushed out all the old stuff. This method will likely use lots of fluid but fluid is cheaper than parts. I don't know if the Lucas Transmission Fix will displace any of the coolant in the system.

I am sure there will more knowledgeable responses before long.

Good luck, blurp

On Mon, 26 Jul 2004 13:06:47 +0100, the illustrious "Alistair Ross" favored us with the following prose:

I have successfully flushed the autobox on my 740 using this technique; it was easy enough - the fluid doesn't pump out so fast as to be out of control (unlike when using this method on the power steering).

Details are here (though you may need to adapt this for your 850):

Oh dear; you are meant to top up at the same time as draining. But look on the bright side - if the fluid was burnt black, the transmission was knackered anyway.

This is what I did on my S70, with the exception of draining first. (I was told by someone with lots of experience not to drain first, and I bowed to his experience.) Assuming your '93 850 uses the same spring clip and oring method of connecting the hoses to the radiator have a spare of each handy. After about 12 litres, the fluid was clean, the recommended amount is 16 litres.