Removing Mercruiser riser studs

[synergy141]

Hi, I'm trying to remove my riser studs (The ones that go into the top of the manifold). Nuts came off, riser is pulled off and I need to remove the studs. I tried double nutting them and that didn't work. Do I need to apply heat or something? Is there a type of thread locker in there that needs to be heated? This is on a 5.0 EFI (2002)

Thanks.

 

[tpenfield]

liquid wrench, heat on the manifold areas around the stud . . . maybe vice grips on a non-thread critical portion of the stud. what ever works.

 

[alldodge]

Agree need so heat, best would be an acetylene but if you don't have that propane will take longer

 

[philbullet]

Also try with it double nutted, taping down on it with a hammer and a plying heat.Spay some PB
penatrating oil and let it soak for a while before.

 

[crazy charlie]

don't waste you time with penetrants.Go with heat and the minimum would be map .Propane wont do it.Charlie