horus1970 Posted April 4, 2017 Share Posted April 4, 2017 (edited) Can anyone tell me if tha bolts on catalytic converters a threaded both ends? As ground bolts and stud off the y pipe end flush with flange and the bolt won't knock through?? Do I actually have to drill flange holes out or will they knock through with brute force? I am at the end of my teather!! Advice would be much appreciated cheers Edited April 4, 2017 by horus1970 Quote Link to comment Share on other sites More sharing options...
Richf Posted April 4, 2017 Share Posted April 4, 2017 you have to drill them out if i recall correctly Quote Link to comment Share on other sites More sharing options...
horus1970 Posted April 4, 2017 Author Share Posted April 4, 2017 (edited) I was fearing that, Anyone done it and can advise best type of drill bit would be best, are the bolts hardened, should I start with a small bit and work my way up? Been on this two days and have the grinder rash to prove it ha Edited April 4, 2017 by horus1970 Quote Link to comment Share on other sites More sharing options...
Aashenfox Posted April 4, 2017 Share Posted April 4, 2017 (edited) Not quite cat 'bolts', but best I could do...? /shrug P.S. Now I have a real problem, my daughter (5) saw me posting this and asked what are these lovely hello kitty things!? Being a good Daddy, I gave a full and complete explanation of what valves and valve caps are. You know what happened next... "Can you put those on your car please, Daddy? Pleeeeeeeeeease"? Well, how could I say no? Hey, they're tiny, it'll be a sweet touch. Now 5 year old boys AND 5 year old girls will love my car. Edited April 4, 2017 by Aashenfox Quote Link to comment Share on other sites More sharing options...
Strudul Posted April 4, 2017 Share Posted April 4, 2017 Now 5 year old boys AND 5 year old girls will love my car. Probably best not to advertise that Quote Link to comment Share on other sites More sharing options...
horus1970 Posted April 5, 2017 Author Share Posted April 5, 2017 Now 5 year old boys AND 5 year old girls will love my car. Probably best not to advertise that . Yeah I agree ha, anyhow I've got to much corrosion on flange at y pipe end so need to take cat to manifold bolts out and bin the cats, there are 3 bolts each side on manifold end and they look terrible, can these be ground off or are they threaded in the flange also?? Sprayed them with releasing spray but don't hold out much hope for them slackening,, Quote Link to comment Share on other sites More sharing options...
Olly350z Posted April 5, 2017 Share Posted April 5, 2017 The manifold bolts can be deceptive, mine looked awful but a couple days spraying and then a good run before hand and they came off easily. I found that on mine only one was threaded into the manifold, the other two (4 total) came completely out. Had the same issue with cat bolts and ended up angle grinding them out, you'll be much better off with a new system chap Quote Link to comment Share on other sites More sharing options...
rabbitstew Posted April 5, 2017 Share Posted April 5, 2017 Good luck with this. I fondly remember doing the exhaust on my 22k miles 4 year old 350z. The entire under side looked lke it had been submerged under sea for 1000 years. The nuts and bolts holding the exhaust just sheered off despite lots of delicate persuasion. Ended up spending hours drilling out the studs which connect the catback bit to the rest of the system. Argh! Quote Link to comment Share on other sites More sharing options...
horus1970 Posted April 5, 2017 Author Share Posted April 5, 2017 Good luck with this. I fondly remember doing the exhaust on my 22k miles 4 year old 350z. The entire under side looked lke it had been submerged under sea for 1000 years. The nuts and bolts holding the exhaust just sheered off despite lots of delicate persuasion. Ended up spending hours drilling out the studs which connect the catback bit to the rest of the system. Argh! . Haha yeah I know what you mean about the bolts,, mine looked like the underside of the titanic,,, was kind of glad I had to get under there as it has prompted me to get the bits of rust sorted under there,Hope I can get those nuts off as got no transport now,,, I don't think they will come off as the rust is insane on the thread and nut, another fun packed day under the zed again tomorow! Quote Link to comment Share on other sites More sharing options...
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