993 cat exhaust bolts !!

[phib]

Before I start attacking these (and get very frustrated! )

Has anyone got any bright ideas how to get the bolts out so the cat can come off ??



baby boy names with g

[gwsinc]

These are studs, not standard nuts and bolts. You’ll have to drill them out, annoying but the only way to get it done!

Make sure you replace with stainless steel when you re-attach.

[phib]

They do look like studs but some of them actually look like they were bolts someone rounded off ... years ago !!!

Have stainless bolts and pipes to go on !!

Phib

[cd1957]

Hi when i do these, i grind the heads of flush, and use heat, with small nozzle to get everything red hot, then hit them out.

I would never use stainless steel bolts and nuts, they can thread baulk to each other, and can be a bigger pain to remove next time.

Chris

[gwsinc]

cd1957 said:

Hi when i do these, i grind the heads of flush, and use heat, with small nozzle to get everything red hot, then hit them out.

I would never use stainless steel bolts and nuts, they can thread baulk to each other, and can be a bigger pain to remove next time.

Chris

Is this the case with Marine grade A4-80 stainless bolts too?

If so you could just use standard bolts and replace them every year for a few pennies to keep them fresh.

[AW10]

if they're not over torqued and a light lubricant is used SS will be fine.

[996GT3Trev]

Phib, yes basically they will take some shifting, as mentioned make sure you go down the SS route if possible.

Also get yourself two new gaskets, your Cat heat shield also looks a little rotten on the edges.

Trev

[kingroon]

I feel your pain phib..

As suggested above, drilling and then replacing with Stainless Steel bolts is the only way to go..

I did the same a while back and then had to remove the SS Bolts again a month ago or so and they came out easy..

>> https://kingroon.blog/2017/05/01/pipe/

[davewood]

Just grind the heads off and use a punch ss
bolts are best to use for replacement but use copper grease before tightening

[BertBert]

Copper grease won't be any good on (rather hot) exhaust components surely?
Bert

[Slippydiff]

BertBert said:

Copper grease won't be any good on (rather hot) exhaust components surely?
Bert

Decent quality Copaslip is good up to 1100 degrees.
Care needs to be taken when torquing up stainless fasteners that have been lubricated : it’s all too easy to overtighten them and in the process do exactly the opposite of what you set out to do (that being avoid their threads galling)