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Diff oil cooler
- Thread starter g59tester
- Start date
scam75
Well-known member
After I broke a 3rd cooler pipe, and trashed a gearbox as a result, I opted for a different solution. One, because they always leak, two, because it's poor design IMO, especially on a lowered car like mine, and three, because one gearbox rebuild is more than enough for anyone!!
Anyway, I got a 13 row Mocal rad and mounted it up out the way above the driveshaft, and ran reinforced rubber pipes back and forward. You will need an adapter kit so it fits the gearbox and then a couple of elbows and stuff. It's a much better solution, and I now have 3 litres oil capacity rather than the stock 2 litres. 3 years on it hasn't lost a drop of oil. All in all cost about £200 for parts. the gearbox rebuild was considerably more................
The likes of Augment Automotive do an off the shelf kit for the conversion.
I found the reason the stock cooler almost always leaks is due to the weight and flexing it does, this problem goes away with rubber piping.
Stuart
scam75
Well-known member
I don't have any pictures to hand, I will get some next time it's on a ramp. My mate has pictures from when we done it in his garage, might be on his FB page. I will check.
Yes, the extra gearbox oil capacity is a nice by-product of this conversion. Must be running super cool now.
Cheers
Stuart
DavidL
Active member
Augment is a completely different design, small ali box akin to a radiator not the long windy thing.Anyway it went on at a service and as far as I know there haven't been any issues.
944Turbo said:On my coupe I had a repair done to the factory cooler by JMG - they replaced the ends with new machined ones bonded in place, It wasn't massively expensive,
Tony
Had the local machine shop make a new end for mine as it had become damaged and started leaking at the oil pump end. I've attached it using some 2-part epoxy but haven't used it yet. I also spent a very long time cleaning and straightening all the cooling fins before a coat of black trim paint to finish it off.
I did have the dimensions somewhere, will have to have a look and will add them to this post if I find them.
The old end is quite easy to remove, gently heat up the end (probably best with an electric heat gun) and keep trying to twist it off, eventually it will just twist right off when the old glue / sealer melts.
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scam75
Well-known member
blade7 said:I wonder how much pressure the gearbox oil pump generates. Pumping oil through a metal tube attached to the gearbox, probably takes less pressure than through longer hoses to a radiator mounted higher.
We had the same thoughts when we done mine. It turns out the pump is very effective, although I can't quantify it in pressure. I had hoped it would be and my mate doubted it would be (silly him), but it filled up the new rad in no time with good flow, so it's more than adequate to run a standalone rad set-up. And that is with thick Swepco oil.
If you were to uncurl the 3 loops in the OEM pipe, it probably goes farther than you think! Granted my rad is mounted up out the way so there is that, but as I said, the pump is plenty effective for this mod.
Stuart
blade7
Well-known member
scam75
Well-known member
blade7 said:Years ago, I worked for a global hydraulics company that designed and made thousands of cooler loops for power steering racks. Quite rightly they were paranoid about failure of the cooling/rack. While it was a simpler design than a 944 gearbox cooler loop, it probably doesn't take much pressure to circulate fluid through either of them. I'd be interested to seen how/where you have mounted the rad on your setup Stuart.
Will get some pics when it's next on a ramp. It's up above the OS driveshaft somewhere, angled to get a bit of air flow. Memory fails me other than that, I've built an engine since then!
Stuart
Eddie
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