I did one recently, maybe just lucky. I used plenty of wd40 and repeatedly backed off and tightened gently. Also had to do the gearbox cooler in the same fashion.

You were lucky. Twisting the bosses off is favourite long before the threads give.
 
If changing just the pipes! How about a dremel or air grinder to cut the nut then chisel it open enough to budge the fittings or at least allowing oil to run into the threads a little?
 
If changing just the pipes! How about a dremel or air grinder to cut the nut then chisel it open enough to budge the fittings or at least allowing oil to run into the threads a little?

Nuts can be removed by cutting and splitting for sure, have done it.
 
If changing just the pipes! How about a dremel or air grinder to cut the nut then chisel it open enough to budge the fittings or at least allowing oil to run into the threads a little?

The pipe is sealed with an O'ring no oil can flow out until nut is backed off.
 
I've had some success using some lube (WD40, Plus Gas, etc) liberally on the nut then boil the kettle and pour the boiling water over the joint needing split. The shock of the boiling water causes the outer nut to expand and it can, in some cases, loosen it enough.....
 
if the threads do come out with the bolt and theres enough metal on the mating parts could you not drill and thread them and fit helicoils to repair the threads ive done a few alloy cast iron and steel thread repairs with helicoils and all are still working perfectly well , as for those O rings dont use ****part only use genuine otherwise youll be doing it again and again ive been there done that several times and after fitting the oem no leaks at all now .
 
if the threads do come out with the bolt and theres enough metal on the mating parts could you not drill and thread them and fit helicoils to repair the threads ive done a few alloy cast iron and steel thread repairs with helicoils and all are still working perfectly well , as for those O rings dont use ****part only use genuine otherwise youll be doing it again and again ive been there done that several times and after fitting the oem no leaks at all now .

Helicoils no use in this application. ;)
 

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