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  #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.
  #21  
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.
http://www.summitracing.com/search/?...FLX-4120&dds=1
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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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Old 31-12-2009
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Hey Taz. Thanks for the very benificial info and feedback from your own system.I will set mine up as per your specs. Can you confirm if you still run the Viscous fan in the xj.
  #26  
Old 31-12-2009
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Quote:
Originally Posted by tazwegion View Post


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 ???
with this set up what sort of daily/average operating temp do you get in the sump?
I have mine the other way and it sits mostly 70 -80, occasionally will hit 90
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Last edited by rainman; 31-12-2009 at 09:04 PM.
  #27  
Old 31-12-2009
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Quote:
Originally Posted by ChrisXJ View Post
Can you confirm if you still run the Viscous fan in the xj.
No actually the previous owner fitted a thermofan (bloody noisy) unsure of the CFM figure but I'd be tempted to "retro fit" a clutch fan should I come across one at the wreckers (I have no fan shroud fitted either)


Quote:
Originally Posted by rainman View Post
with this set up what sort of daily/average operating temp do you get in the sump?
I have mine the other way and it sits mostly 70 -80, occasionally will hit 90
I have no temperature monitoring device for the transmission, however I can tell you the "shift" lever shaft that on occasions became too hot to touch now only gets very warm, I do plan on fitting a temp sensor in the future and am leaning towards the unit trialled by carvesdodo in the thread previously linked (OR a basic VDO configuration)
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