If this question belongs in a different section please let me know. I thought maybe M10 1.25 bolts and studs were more of a shop talk question than a particular model.

 

About half of the exhaust bolts that come out of the heads on my donor motor (1995 EJ22) have come out. They are all rusty and I want to replace them. They are M10 1.25 "studs" and I called the local Subaru dealership here in Jackson, MS and they aren't showing any replacement studs on their "blow-up" of the exhaust system or the heads.

 

I would assume these are high heat studs and bolts. I really would like to replace all 6 in case I have to take the engine or exhaust off ever again. I can probably make due with what I have, but I would prefer to change them out if at all possible. Does anyone know a part number for the studs and bolts?

 

There are 3 of these studs still attached to the heads. I have tried getting them out with vice grips with no luck. They are very very rusty. Is there a product better than PB Blaster that I can use to clean them up if I can't find replacements?

 

Any help would be greatly appreciated.

 

Thanks,

 

B

 

ps- I havent even tried to loosen the bolts on my dead 2.5 yet. Hopefully the bolts will be in better shape and I can reuse them... maybe the studs from the 2.5 too...

Edited August 6, 200916 yr by BluetoE
Not sure if this question belongs here or not...

correct, 10x1.25 threaded studs. easiest solution is just to get them at a local auto parts store. they have 10x1.25 studs, use those. they won't list any applications for Subaru's, just find the 10 x 1.25 studs.

 

in some cases the stud will come with a center section that isn't threaded, you get those and put the shortest threaded end into the engine that way the "unthreaded" portion is under the nut and benign.

I went to NAPA, Autozone, Etc. with no luck. A local muffler shop had one stud just like you described with the missing threads near one end, but they didn't have 6. They told me to try NAPA

 

I'm going to the dealership tomorrow to pick up a new separator plate ( I ordered one before reading that the 2.5 would have a metal one I could swap out for the crappy plastic one on the 2.2 ), so I will see if they have any studs.

 

I am still curious about a rust removal product to help me get the old studs out.

 

Thanks for the reply, GG.

<<I am still curious about a rust removal product to help me get the old studs out. >>

 

are you able to run a nut onto the stud or are the treads trashed?

There's a product made by Wurth called "Rost Off" that puts PB Blaster to shame. Its a bit pricey at some places if you can even find it (probably won't ever see it at your local parts store), but well wurth it. :-p pun intended

To get the old studs out thread two nuts onto each one about halfway and tighten them against each other. Then use an impact wrench if you have access to one, or a breaker bar to crack them loose. If it were me I'd leave them alone unless the threads are already trashed.

Find a fastener shop in your area (Phone book) and order some stainless steel studs if you're really concerned about rust. Otherwise just buy a generic pack of studs and call it a day.

heat the head up after a good soaking from pb blaster or equivalant(make sure its evaporated enough) and do the two nut trick and an impact gun or get a stud puller, with the heat the head should expand enough to get those bastards to come out

I have ordered these studs from subarugenuineparts.com

the part number is 800910550

 

instead of removing them all you could clean up the threads with a die.

Cool. Thanks for the tips and part number