how easy is it to remove the gearbox oil cooler that sits underneath my uk 1990 tt.? assumming thats what it is. my cars at my brother garage having all the brake pipe replace and im going to do a hicas deleation as well so i thought whist im there i might as well get rid of some more unsightly pipe work.

Don't get rid of the gearbox oil cooler.

Isnt there an oil cooler that sits near the diff area that is only on a uk car or is it a cooler for somthing else.is it a rear diff oil cooler

Uk cars have additional cooling that Jspec cars do not have.

 

In autos, an additional dedicated cooler, as apposed to the radiator loop on Jspec cars.

In manuals a dedicated box cooler exists albeit small, there is no cooler on a Jspec. I have mine looped out on the recommendation of silver bullet who never had one on his track car, he considered it unnecessary.

 

Engine oil coolers, the uk spec is a 19 row (aka nismo cooler) the Jspec is roughly half that size.

 

The last two are the diff oil cooler and power steering fluid cooler, being located in the rear and front as you would expect. These are both uk only things. For a side note iirc the Psf cooler is on a hicas line, look into that.

I have a uk car yes there is a cooler for the diff but don't take it it off its a good thing to have the auto box cooler in the uk car is in the rad loop when I changed my rad I fitted a dedicated oil cooler for the auto box

Edited November 7, 201311 yr by dan300zx

mines a man tt

uk car has a dif cooler

Do we need that or can i bin?

the jap car don't have it the uk cars do deffo keep it its only a good thing to have keep the diff oil cooler no reason to remove it atall

You may as well ditch the diff cooler as it's over engineering from Nissan and the chances are it doesn't have any oil in it anyway.

Having been involved with breaking way too many zeds and many been UK spec, never once have I removed a diff cooler that had any sign of oil ever been in it, the cooler sits high up and for it to operate the diff has to get very very hot, this in turn activates the pump, as the diff cools the pump switched off and the oil in the cooler drains back to the diff.

 

I believe the temperature the switch activates at is simply too high and so the system never works, again and again I have removed these coolers and inside they look clean and dry, the coolers pipe work sits a bit lower and will some times leak oil so some does make into there sometimes but not by the pump action.

 

The pipe work coming out of the cooler is easily broken and often these can fracture in use, as a result many UK zeds diff coolers have been deleted anyway, diff failure is rare and when it does occur it usually will be caused by leaks.

 

The other thing to consider is where diffs have failed on UK spec cars they are replaced by Jap spec ones anyway as there is more of those available, so kind of blows the argument for needing a cooler.

 

 

Jeff TT

Edited November 7, 201311 yr by JeffTT

Oil coolers were added/upgraded to Euro spec cars after high speed testing by Nissan on German autobahns.

 

The description of the system is here:

 

http://www.300zx.co.uk/tech/manual/manual/pd/035.gif

 

Circuit diagram:

 

http://www.300zx.co.uk/tech/manual/manual/pd/037.gif

 

-Andrew

just keep it

Oil coolers were added/upgraded to Euro spec cars after high speed testing by Nissan on German autobahns.

 

Exactly! as suggested above if you have one fitted leave it, if it leaks / breaks take it out.

 

Jeff TT

I will also be doing a hicas compleate removal/elimination with one of thoes kits that take away all that pipework aswell and i was at the understandin that there was a pipe that shared a solanoid or somthing.thats why i had it in my head to get rid of all that stuff in one go whislt pulling that lot about.

Thanks again for all your input oh and jeff have you a little black box that you can post to me.the one that plugs in for the rear lights to work.that sit on the os rear light unit inside please.cas i think iv killed mine.cheers.