XJ Transmission Oil Coolers

[shaheenis]

I would prefer my tranny cooler on the cold side but usually tranny fluid temps are much higher than water temps so either side will remove heat and difference is probably marginal. If temps become a problem for me I will add a external cooler in line so hits radiator first then cooler. Is the smaller radiator on the front of the XJs for PS? Sorry I am new to jeeps.

[junglejuice]

Originally Posted by shaheenis

I would prefer my tranny cooler on the cold side but usually tranny fluid temps are much higher than water temps so either side will remove heat and difference is probably marginal. If temps become a problem for me I will add a external cooler in line so hits radiator first then cooler. Is the smaller radiator on the front of the XJs for PS? Sorry I am new to jeeps.

No that is the trans cooler....

[carvesdodo]

Originally Posted by shaheenis

I would prefer my tranny cooler on the cold side but usually tranny fluid temps are much higher than water temps so either side will remove heat and difference is probably marginal. If temps become a problem for me I will add a external cooler in line so hits radiator first then cooler. Is the smaller radiator on the front of the XJs for PS? Sorry I am new to jeeps.

heh heh ... nahhhh ... thats the massive, factory fitted tranny cooler....

Which is the whole reason for my drawing post of the LHD / RHD variation.

LHD XJs in-tank oil "cooler" is fitted to the cold side of the radiator ... and then for heavy duty applications ... that little cooler you think is a power steering cooler ... is offered as an optional, extra tranny cooler.

RHD OZ XJs got that little cooler as a std fitting ... probably to make up for the in-tank oil "cooler" dangling in the hot side of RHD XJs.

Probably a good idea to replace it with something better - if you are considering towing and want to extend the life of an aging gearbox.

[Nakkas]

Originally Posted by shaheenis

I would prefer my tranny cooler on the cold side but usually tranny fluid temps are much higher than water temps so either side will remove heat and difference is probably marginal. If temps become a problem for me I will add a external cooler in line so hits radiator first then cooler. Is the smaller radiator on the front of the XJs for PS? Sorry I am new to jeeps.

Not sure if you temperature statement is correct. My tranny runs normally at 70 to 80 Deg and my thermostat setting for engine cooling it set at 95 deg, so Tranny temp is cooler. Am I not seeing something correctly???

[carvesdodo]

Originally Posted by Nakkas

Not sure if you temperature statement is correct. My tranny runs normally at 70 to 80 Deg and my thermostat setting for engine cooling it set at 95 deg, so Tranny temp is cooler. Am I not seeing something correctly???

Wheres your temp sensor located ???

One mounted on the gearbox output line to the radiator - can show some scary high temps ....

Presuming your temps are sump temps or return line temps ... thats not bad compared to the factory spec 50'-80' op range.

..... and much better than my old temps of 80' - 120'

[BS!]

Ok looking at fitting the b&m 70268 to the mechanical fan side bypassing the radiator. Do I need any extra fittings or hoses etc to do this install? This is my only vehicle so I don't want to get half way through the job and realise I need something else from in town to finish it off. Also what's the best way to block the radiator once it has been bypassed? Cheers

[carvesdodo]

Originally Posted by BS!

Ok looking at fitting the b&m 70268 to the mechanical fan side bypassing the radiator. Do I need any extra fittings or hoses etc to do this install? This is my only vehicle so I don't want to get half way through the job and realise I need something else from in town to finish it off. Also what's the best way to block the radiator once it has been bypassed? Cheers

Buy yourself a few spare meters of tranny line hose and some clamps,
Cut the factory pipes shorter and clamp the hoses on.

Just make sure you flush the pipes before refitting ... to get rid of any filings ... a pipe cutter causes less mess than a hacksaw.

Seems to be common on stock height XJs for the control arm to squash the factory hardlines alongside the sump ... so you might want consider rerouting hoses to fix that issue while you have stuff apart.

The heat exchanger fittings really dont need blocking ... This is all there is dangling in the header tank. ... theres no anti-freeze crossover unless the heat exchanger is split and leaking.