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  #17  
Old 15-12-2009
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Whilst going over the XJ today I thought I'd grab a picture of what Chrysler thinks is sufficient to cool the AW4 transmission when towing, FWIW in person it's about 1/3 the size of what Davies Craig recommend for an aftermarket upgrade (part #678)



  #18  
Old 15-12-2009
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Default land rover by comparison......

I've had quite a few land+range rovers and they have external fluid to air cooler auto trans coolers and then fluid goes via thermostat into "hot " side of radiator or back to transmission they also have a thermostat that stops fluid from going to getting cooled at all, further they also have an engine oil cooler in the cold tank of the radiator, and a fluid to air transfer case cooler.......this full house of coolers are fitted in vehicles that are meant for hot climates......for cold climates they run things differently, to keep fluids warm enough.....i had a range rover and a discovery which had electric elements in the windscreen glass ( not copper printed!) and the discovery had a separate diesel interior heater that could be run while engine was off! scotland is cold! ......truth is Rover builds all sorts of climate specific cooling (and heating) arrangements.....that's one sad point about jeeps, they're pretty basic- nice and simple which is a real plus point really!, but cheap for parts by comparison.
  #19  
Old 17-12-2009
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Well I've semi mounted the transmission cooler in the only place available (once I tossed the original Jeep one) partly in front of the radiator but 90% below sitting in the air flow from the bull bar vent through to the engine bay (via cut outs below radiator), according to Davies Craig line orientation isn't a big deal so this should work relatively well (I hope) and still have sufficient room for an aftermarket (motorcycle) thermo fan if necessary

A few different angles from the camera shoved under the bullbar




Yes you may have noted it's off-centre somewhat... that'd be because of the front chassis "cut outs" the cooler is sitting directly in front off


EDIT: well it's been properly fitted for 5 days, flaring the ends of the pipe sections (with the tip of a closed pair of pointy nosed pliers) and fitting 2 hose clips to every connection (opposing clamp configuration) has been very effective at preventing leaks in the transmission lines... highly recommended, it also appears to be keeping the transmission more adequately cooled with sufficient airflow being directed through the factory bullbar's lower intake venting (mounting in front of a factory frame/chassis cutout would also be contributing to effectiveness)

To maximise the flexibility of this cooler I installed it in series with the existing heat exchanger (located in the hot side of the radiator), thus the transmission wouldn't spend longer below recommended operating temperatures than necessary yet had a greater capacity to reduce the transmission oil before returning to the AW4 transmission, thanks to carvesdodo for the doing most of the graphical leg work




Additional post note: After traveling up to the Victorian/NSW border and back I can say without reservation this configuration made a definitive impact on improving the transmission operating temperatures even in what I would consider extreme sweltering conditions, my method of comparison was as "unscientific" as you can get utilizing the sensor pads in the tip of the fingers, crazy you say? not at all... previously whilst motoring about town the transmission shift lever would get "so hot" as to be untouchable, after the #678 had been fitted the hottest it reached was extremely warm and seeing as the shift lever is in contact with the transmission heat would obviously be radiated though it as well

Future planned upgrades
  • Motorcycle thermofan for #678 (and auxiliary switch)
  • Method of monitoring transmission temperatures

Last edited by tazwegion; 31-12-2009 at 08:35 PM.
  #20  
Old 30-12-2009
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Default Trans Cooler Install AW4

I am going to install the Craig Davis P/N 678 cooler and a VDO gauge to the XJ AW4 Trans. I have done the search and I am now totally confussed with all the opinions on how to install the cooler. Can someone please give me the best way to install the cooler. Some threads say run the Radiator trans cooler first and some say run only the new cooler. Others even say run the OEM cooler and the new Cooler. PLEASE HELP.
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Old 30-12-2009
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is the vdo gauge sender going in the sump or in the cooling line?
I vote for trans cooler first then radiator cooler and keep the oem air cooler for the power steering a la gojeep.
1. this helps the trans reach operating temp quickly in especially in winter
2. Seriously hot oil temps of 105C+ will still lose heat in the radiator

I don't like the idea of bypassing the radiator cooler unless there is an independent fan on the aftermarket oil cooler.

....take cover hear come CARVS....

Ps I have the gojeep oil cooler (about $80 landed in Australia at the moment)and taurus fan and it works great,
trans sump temps are mostly 80 occasionally gets to 90 yet to see 100.
I am sure that there are other ways of doing it that will also work.
Good luck with it.
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Last edited by rainman; 06-01-2010 at 06:17 PM.
  #22  
Old 31-12-2009
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Thanks for the info Rainman. I did read the Go-Jeep write up and it did make alot of sense. I do still have the viscous fan on mine and was wondering can I still run the cooler in the same position as Go-Jeep and acheive the same outcome. Secondly did you manage to purchase the Cooler from an Australian Supplier. Cheers
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Old 31-12-2009
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I got mine from summit racing in the states.

I like the idea of a cooler that is not quite as long as the one gojeep used, in the same place and with a fan in front of it.

Although I have not tried it.
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  #24  
Old 31-12-2009
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Quote:
Originally Posted by ChrisXJ View Post
I am going to install the Craig Davis P/N 678 cooler and a VDO gauge to the XJ AW4 Trans. I have done the search and I am now totally confused with all the opinions on how to install the cooler. Can someone please give me the best way to install the cooler. Some threads say run the Radiator trans cooler first and some say run only the new cooler. Others even say run the OEM cooler and the new Cooler. PLEASE HELP


I installed the Davies Craig #678 cooler in this configuration because...
  • The plumbing was easier
  • I wanted faster warm up times for the transmission oil (reduce cold operation wear)
  • The oil cooler assists the radiator via the transmission heat exchanger located in the radiator "hot" tank
  • The coolest possible oil was in the return line to the transmission


More details can be found in the thread titled Oil Coolers ... XJ nescessities ???
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