97 Toyota Corolla exhaust nuts?

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Old 09-10-19, 10:47 AM
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97 Toyota Corolla exhaust nuts?

I have a 1997 Toyota Corolla, 1.6 4 cyl auto w/ 250k miles that needs a new exhaust - from manifold to cat. I know about rusted bolts/nuts, but what I am wondering about is that the actual nuts where the exhaust bolt to the manifold don't look like regular nuts - so I have to ask - does any know - are these regular nuts or are they some sort of locking nuts or is there some thing more to them than just regular nuts. Again, they sure don't look like regular nuts.
 
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Old 09-10-19, 11:01 AM
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There are two styles used. They are both of the self locking variety.
The old ones will need to be heated with a torch to be removed.

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Old 09-10-19, 11:09 AM
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Wow, thanks for the quick reply and the answer - that certainly explains things. To get them off, can I heat them up with a plumber's propane torch and then unscrew or is that not hot enough or is there yet another trick?
 
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Old 09-10-19, 11:11 AM
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I always used an oxy/acetylene torch but a plumbers torch should work. The exhaust manifold sucks up a lot of heat. The nuts need to be red hot to be removed. Don't reuse them.
 
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Old 09-10-19, 11:23 AM
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Propane is never going to get them hot enough, they have to start to glow red hot in order to remove them.
 
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Old 09-10-19, 11:28 AM
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How about this - can I just break off the nuts/bolts - do you know are these studs that are integral with the manifold or will I be able to break the bolts and pull them out and insert new ones?
 
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Old 09-10-19, 11:31 AM
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I'm not sure on that car but typically if you break the studs off you'd need to remove the exhaust manifold(s) to get access to replace them. I would not recommend breaking them.

A plumbers torch with Mapp gas may do it.
 
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