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Anyone any experience of flushing a trans cooler with out £500 of equipment?
After the clutch plates on my auto range rover failed I have bought a re manufactured trans, they make the point very strongly that the cooler must be flushed before fitting it which given the old oil looked like engine oil I can understand. It's a bog brush type cooler which as far as I can see is a loop of pipe with fins welded to it..
Originally I planned to pump litre or ATF through it in each direction using a carb fuel pump, reading on line it seems the pro cleaners use some sort of solvent, I was wondering whether I might be better pushing some petrol or something similar through it instead, any thoughts?
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Ritchie
Club Retro Rides Member
Posts: 765 
Club RR Member Number: 12
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flushing transmission coolerRitchie
@ritchie
Club Retro Rides Member 12
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A gallon of brake cleaner would be my preference. If you punch a hose sized hole in the lid poke a hose through it to the bottom of the can and attached the other end of the hose to the cooler, then pierce a small hole in the lid as well, you can blast the fluid through if you put an airline with a blowgun onto the small hole on the lid.
You can then catch the exiting fluid in another can and do it again if you like.
Just be careful not to explode the can or blow the lid off, it will clean it better internally with a bit of force.
Then a good blast out with an airline to dry.
I hope I've explained that clear enough.
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Thanks,
sounds like a good plan,
Just ordered 5L of brake cleaner,
I've got a device I made up for pushing gear oil out of 5l cans, basically a tyre valve and tube through a steel plate with the bottom covered in rubber sheet, hold it to the top of the can with a bungee band wrapped around the bottom of the can and apply a airline to the tyre valve and oil comes out of the tube, too much pressure and it just lifts off and releases the pressure, hopefully this will do the trick.
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stealthstylz
Club Retro Rides Member
Posts: 14,829
Club RR Member Number: 174
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flushing transmission coolerstealthstylz
@stealthstylz
Club Retro Rides Member 174
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Mar 20, 2020 12:48:05 GMT
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How much is a new cooler? I wouldn't risk it personally, whether they are completely clean or not seems to be down to pure luck. We've had issues at work and all the coolers go through the exact same ultrasonic machine and cleaning process. They always come out looking mint but there have been several occasions when once it's driven there has been foreign object ingress that has caused issues.
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Mar 20, 2020 13:57:46 GMT
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you can't get new lines and the cooler is around £300 if you can find one (there are lot of very similar ones used on discos and defenders it may be the cooler and lines from one of these could be adapted to fit but it difficult to know for sure), the oil was black but there doesn't seem to be any larger particles, it drove fine in reverse! (the A clutch had failed). I dis see a U.S. video where they put a filter in the return line, I have a couple of large steel cased fuel filters and thought about doing this even if only for the first 100 miles or so.
Given I have just been told I might not be getting paid or at best have a substantial pay cut in 4 weeks time buying a new one is not on the cards!
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Ritchie
Club Retro Rides Member
Posts: 765
Club RR Member Number: 12
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flushing transmission coolerRitchie
@ritchie
Club Retro Rides Member 12
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Mar 20, 2020 14:51:35 GMT
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I've seen inline filters designed for power steering systems that might be a good idea.
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Mar 23, 2020 21:42:22 GMT
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I’ve cobbled these together before. I would use a new cooler if you have one to hand. Any type of oil cooler, simple 13 row ones that are available everywhere just because the atf acts as a cleaner(as I’m sure you’re aware) and will wash crud out of every and any corner.
Had one of the metal oil pipes corode creating a pinhole which was peeing out under pressure. Quick fix was to cut 3 inch out of metal pipe and jubilee a piece of decent fuel pipe in its place. No flares on pipe, just cleaned up and decent fitting hose well overlapped. Single jubilee at either end and never had a bit of bother forever.
After spending your hard earned at Ashcroft’s it would be a shame not to.
I’d even run it through some looped 8mm copper than use the old one, least you know it’s clean.
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TessierAshpool
Club Retro Rides Member
Posts: 507
Club RR Member Number: 168
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flushing transmission coolerTessierAshpool
@tessierashpool
Club Retro Rides Member 168
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Mar 23, 2020 23:07:06 GMT
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I'm not going to say this is recommended, but when I flushed the trans on my Supra, I just bought an extra 5L of fluid, disconnected the cooler at the outlet, ran the car with one end in an empty bucket and one end in the new fluid. Ran two cans though like that until it was fully clear then turned off. Shifted it through the gears as it sat. Bit sketchy maybe but shifts lovely now.
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