camshaft cap nut

OEM+ Joined: Feb 23, 2010 Posts: 164

one of my valve cover bolts snapped in the camshaft cap thing under the valve cover

so i got a replacement part went to go torque it down and the threaded rod that the nut goes on snapped off with the nut on it

is it possible u can replace this bit and rethread a new rod in at all or would u need a whole new cylinder head

Posted: Thu Apr 08, 2010 12:35 am

you got a pic dude as struggling to figure out quite what you have broken

dave

OEM+ Joined: Feb 23, 2010 Posts: 164

ill try get some pics up of whats happen im not the best as describing things

OEM+ Joined: Feb 23, 2010 Posts: 164

kerrly1 wrote:

you got a pic dude as struggling to figure out quite what you have broken

dave

pic of the camshaft cap bolt that snapped

Moderator Joined: Jul 20, 2008 Posts: 2100

you can remove the cam cap studs.

what i'm wondering is how the hell did you snap it ?

they have to be torqued down to specic tightness and it's not that tight, over torque them and it can force the cap to distort and bugger up the clearance between bearing and cam. that normaly results in quite a mess

OEM+ Joined: Feb 23, 2010 Posts: 164

so you can wind the threaded stud out then

and i torqued it down 2 6 newton meters plus quarter turn ussual u can feel the tention built through the spanner or ratchet but this had nothing and just come off

Learner Driver Joined: Jul 31, 2010 Posts: 18

ive done exactly the same as this guy

anyone know where i can buy a new bearing cap from or is it a case of new head?

OEM Joined: Nov 03, 2009 Posts: 97

Not 100% sure but I thought bearing caps were matched to the head.

Moderator Joined: Jul 20, 2008 Posts: 2100

thats still servicable.

go to a machene shop and wave it and them and ask for help, they'll find a way of fixing it, as a new head for 1 cam cap is not funny

OEM+ Joined: Feb 02, 2009 Posts: 202

The torque settings for the bearing camshaft nut is only 20 Nm / 15 lbf ft. Once this setting is reached, they should not be turned any further!

They should also be fitted in a certain order, the cambelt end is no.1.
Fit cap 2 and 4, tightening the nuts in a diagonal pattern till the camshaft is in place.
Then fit the others, make sure they are all the right way round, with marks towards the drive pulley.
Tighten all the caps down in a diagonal pattern to 20 Nm. Wink

Posted: Sun Aug 01, 2010 10:52 am

Use a tool called a Easiout to remove the damaged bolt then if required retap the thread using a thread tool or drill and use a Helicoil kit Cool

Learner Driver Joined: Jul 31, 2010 Posts: 18

cheers guys, ill let u knw how it goes, will prob try on tuesday.

OEM Joined: May 08, 2010 Posts: 129 Location: London ish!

Any chance you can take a pic of the whole top of the cam please as I think I'm missing a cam bush cap.... Cheers!!

Posted: Sun Aug 01, 2010 10:48 pm

How many you got ??

I had my cam cover off yesterday and thought that aswell !!

theres one lobe that looks like it should have one and doesnt, it also doesnt have the threads or holes for a stud to go tho Laughing

so i kinda guessed its how they are

OEM+ Joined: Feb 02, 2009 Posts: 202

Yeah, that's how they are on the hydro follower types.

Older shimmed cam followers have the no4 bearing, later hydro ones don't.. for some reason.