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Old 26-11-2009
carvesdodo  carvesdodo is offline
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Exclamation XJ Transmission Oil Coolers

This thread includes a thread started by chrisXJ which we had merged to keep similiar info together and save some search time.

In addition to the info posted in this thread .... there is also a collection of threadlinks a few posts further down.




As there is lots of thoughts on whys, why nots, sizes, line routing, bypassing stuff, cooler before heater, cooler after heater etc etc .....

How about a collection of info in the one thread including links to past threads and posts on oil coolers.

I'll start with this ......

The red and blue colours denote coolant temps,
The long thin pipes are the tranny line connections.

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Last edited by carvesdodo; 03-02-2011 at 02:14 PM.

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Old 27-11-2009
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See... there's more to a vehicle conversion than simply swapping the steering gear to the other side!

Going by that pictorial display, the US version's auto fluids are "exchanging heat" in the coolest section of the radiator whereas, the Oz variant is trying to "exchange heat" in the hottest section surrounded by the engine coolant straight out of a hot motor... that's been well though out eh?

In a nut shell... if the coolant surrounding the transmission oil "heat exchanger" is at a higher temperature there can be NO reduction in transmission oil temperature, thus an external aftermarket transmission cooler should be considered a "must have" item for a vehicle getting lots of use in a multitude of weather/driving conditions, the ONLY benefit I can see with this configuration is a quicker warm up period for the transmission

Last edited by tazwegion; 01-12-2009 at 06:20 PM. Reason: cleaning up for sticky status
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Old 27-11-2009
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Quote:
Originally Posted by carvesdodo View Post
As there is lots of thoughts on whys, why nots, sizes, line routing, bypassing stuff, cooler before heater, cooler after heater etc etc .....

How about a collection of info in the one thread including links to past threads and posts on oil coolers.

I'll start with this.

The red and blue colours denote coolant temps,
The long thin pipes are the tranny line connections.

Very interesting there Carves....
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Old 28-11-2009
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Got a new cooler on the way but when routing it should the radiator be bypassed altogether? i was origionally going to still use the radiator and flick the old cooler but now wondering if its better to run the coolers in series and bypass the rad altogether? Thoughts anybody? my head hurts?
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Old 28-11-2009
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Great idea for a thread! I've added it to the XJ modifications sticky under "Oil coolers"
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Old 28-11-2009
carvesdodo  carvesdodo is offline
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Quote:
Originally Posted by two dogs View Post
Got a new cooler on the way but when routing it should the radiator be bypassed altogether? i was origionally going to still use the radiator and flick the old cooler but now wondering if its better to run the coolers in series and bypass the rad altogether? Thoughts anybody? my head hurts?
Just my opinion .... but you need a gauge so you can see whats happening now ... and what happens after you make changes.

Factory stated "normal" temps are 50'c - 80'c ... Im getting average 75'c temps with two crappy factory aux coolers bodged together and the radiator bypassed.

Its only a temporary keep it on the road set-up ... and doesnt perform well in overdrive - on hills or towing ... Overdrive of course, is not the gear to be using in those conditions
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Old 29-11-2009
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The following is a collection of threads originally posted to resolve a particular persons problem.

As with all threads ... there is an excellent collection of incidental info by the responding posters.

By reading all available info it is fairly easy to gain the knowledge and insight needed to make a decision on how, what, why ... and even why bother with ... cooling the XJ AW4 gearbox.

Will add more links as they are found/posted






AJOR General XJ Threads ... http://www.ausjeepoffroad.com/forum/...play.php?f=123

Auto Trans fluid boiled - 4l 96 XJ 4 speed ... http://www.ausjeepoffroad.com/forum/...ad.php?t=91612

Anyone else annoyed with there oil coolers? ... http://www.ausjeepoffroad.com/forum/...ht=oil+coolers

Auto transmission troubles ... http://www.ausjeepoffroad.com/forum/...ht=oil+coolers

Finally bought an XJ! Cooling issues already hahaha! ... http://www.ausjeepoffroad.com/forum/...ht=oil+coolers

Auto transmission lines to cooler? ... http://www.ausjeepoffroad.com/forum/...ht=oil+coolers

Auto transmission temp gauge ... http://www.ausjeepoffroad.com/forum/....php?p=1005757

Auto Transmission cooling Thoughts ... http://www.ausjeepoffroad.com/forum/...ht=oil+coolers

XJ for towing ... http://www.ausjeepoffroad.com/forum/...ht=oil+coolers

Trans temp guage ... http://www.ausjeepoffroad.com/forum/...ad.php?t=92110

Auto overheating at 110kph? ...http://www.ausjeepoffroad.com/forum/...ad.php?t=94805
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Last edited by carvesdodo; 06-04-2010 at 09:41 AM. Reason: added more thread links
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Old 29-11-2009
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So where would you mount an extra oil cooler?
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