Maybe I'm slow or something, but why not just take off that nut and slide the cooler off the nipple?

I'm pretty sure I didn't unscrew the nipple last spring when I had the cooler off.

Alistair

> On Jan 4, 2014, at 2:15 PM, JRodgers <jrodgers113@GMAIL.COM> wrote:
> 
> I am almost ready to remove the cooler after my big oil leak. Have new
> O-ring, new filter and oil ready to go, and an exquisite 3/8 internal
> pipe wrench.
> 
> Question:: Does the big nut threaded on the pipe though the oil cooler
> have to come off before the pipe itself can be backed out? Or is the nut
> there just to set the position of the cooler on the pipe?
> 
> I ask for two reasons:
> 
> 1) 24 MM is the largest socket I have - I don't what size that nut is -
> and if I have to buy one - I would appreciate someone telling me what
> the correct size is.
> 
> 2) The nut on the pipe has shoulders - and I don't think it will be
> possible to get a socket to fit to it and hold. The nut shoulder extend
> above the surface of the recess it fits in, but with the shoulders
> rounded  - factory rounded it's obvious - the socket won;t grip.
> 
> Will just reefing on the pipe with the internal pipe wrench - without
> loosening that nut - do any significant damage?
> 
> Any ideas as to how to approach this little project?
> 
> Thanks,
> 
> John