33 replies to this topic

[P11 COV]

I've noticed the exhaust getting nosier lately. Checking it out yesterday I noticed the top corner bolt from the manifold was missing. Its the one nearest the coolant tank,

I put a random (correct size) bolt that I found in my garage on and its done the trick.

However should I get the correct type of bolt? - those star type ones as the in piccy below. (Those are from the other end of the engine BTW. Old picture)

any reasons for using a particular type of bolt?

[FLD]

The torx bolts are a stud. The torx fitting is to tighten it then you fit a nut. They are only about a quid for a new one.

[P11 COV]

The torx bolts are a stud. The torx fitting is to tighten it then you fit a nut. They are only about a quid for a new one.

Sorry - I am a bit of a numpty - can you explain that again??

[starlight]

Allow me, it should be a stud, not a bolt. The stud has a small torx head to aid fitting. The one in the picture is the nut. It is probably worth changing your random bolt for the correct stud/nut to aid possible future removal due to the extreme heat cycling on the grade of steel of the fixing.

[Dan 4]

I have just found my invoice from Auto Vaux for the studs and nuts from when I changed my manifold. Studs are 45p each and nuts are 9p each!!

[TheRealVXed]

And get brass nuts while your at it. You will never have an issue undoing them then ever

[P11 COV]

Allow me, it should be a stud, not a bolt. The stud has a small torx head to aid fitting. The one in the picture is the nut. It is probably worth changing your random bolt for the correct stud/nut to aid possible future removal due to the extreme heat cycling on the grade of steel of the fixing.

Right. I have got my terminology confused. There was a stud without a nut on it. I have put a nut on it and tightened it up. Should I put a torx nut on? Is that what is in my picture?

[slindborg]

Puta brass/copper nut on there instead

[smiley]

Right. I have got my terminology confused. There was a stud without a nut on it. I have put a nut on it and tightened it up. Should I put a torx nut on? Is that what is in my picture?

oem studs and nuts:

Torx part on stud is only to get it in the engine block.
Nut is a normal one. Instead of above oem, brass/copper versions are advised.

Edited by smiley, 15 May 2012 - 10:29 PM.

[FLD]

The nut in the picture is a brass one. Tighten it up and drive it. Should be fine.

Edited by FLD, 16 May 2012 - 07:47 AM.

[Pidgeon]

The nuts I received from Vauxhall are the same as those in Paul's picture, not Smiley's above. I assumed the length and Torx head were to assist fitment/removal in the very limited space available.

[Arno]

Turbo's have the tall nuts with tapered tops as in the original picture. N/A's use the normal/flat nuts shown in the photo by Smiley. Both will fit/exchange though... Bye, Arno.

[P11 COV]

So the general opinion is that they don't have to be nuts like in the picture. A mormal nut will do but good idea to get a brass one. What size are they?

[smiley]

Google says M8 self locking for my NA picture versions.

[techieboy]

M8 on the turbo as well, Paul. At least that's what the EPC says.

[P11 COV]

Thats the right nut in that picture. So it is a normal type nut with a star type end on it. So back to my original question - does it need to be that type? Why is it like that?

[siztenboots]

if you put in a bolt thats too short, then it will probably strip the ally thread and ruin your cylinder head.

the torque to tighten them to is very small ,

Exhaust Manifold with turbocharger to cylinder head 8nm

[vocky]

if you plan on selling your car then just fit any bolt, if you plan on keeping your car for a while then only use the correct fitting I doubt they are more than a few quid and most likely in stock at Crownhill

[JG]

TIS doesn't give a torque setting for the studs, i suppose they'll torque up with the torque of the bolt, but it would be better to have a torque for both.

[Zoobeef]

I would probably do them the same as the nuts if its not in the TIS. They have thread lock on them aswell. The nuts were 8nm wait 5 mins then 8nm as far as I remember. To tell you the truth I'd probably do the studs with just my highly torqued elbow if it was mine and torque the nuts