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The only place for a coil spring is up Zebedee's arse
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Seeing as I'm about to be replacing the gearbox on the DSE I was thinking of flushing the oil cooler. I don't know what's gone wrong in the old gearbox and I don't want to risk any more damage then necessary by any crap that might be floating around in the oil system.

I've been looking on Google and found a video on YouTube of Eric The Car Guy flushing an oil cooler using a can of spray solution.

Video of cooler flush

I can't find anything similar in the UK so I was wondering about flushing it backwards with ATF or possibly Diesel, I just wondered if anybody had any suggestions or ideas.

Thanks

David.

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Acetone should do the trick. Evaporates nicely too,

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I know that Ashcrofts strongly recommend it. It is the main reason for gearbox failure after a rebuild.
I would have thought petrol via a rubber tube and funnel first to flush any metal bits out.

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Diesel fuel - anything else as above is probably too volatile/thin.... !
( I use it for engine flushing, or even paraffin will work fine for that matter...
the proprietary stuff is just hugely-overpriced petroleum-based nonsense)