View Full Version : Rocker cover bolts - doing up
Is there a specific torque for doing the bolts up?
is there a tightening sequence too? I can't find it in the haynes manual
bass_direct
10-02-2007, 23:41
hand tight...
then a little tighter.. there is a sequence i believe tho, work your way outwards anticlockwise.. if that makes sense.
be carefull ,they tend to snap !!!! :twisted:
its just that I do mine up with a normal socket/wratchet and it seems to leak :(
But as im doing them up... it gets to a point where they just wont get any tighter, but you can still turn them - as if they are threaded.. but they're not :(
losing oil and flooding the core plugs with oil so it cuts out is not fun :(
are they the right length bolts
Clio_GTT
11-02-2007, 16:04
sure they're not threaded ?
have you checked the gasket ??
doing the bolts up wont help if its buggered
gasket is only about 6k old
from when it went last time :?
Got another rocker cover to go on (polished), will fit another new one then
erm, the bolts mite be fine,your overtightening them into an alloy head, its possible the thread in the bolts holes in the head has threaded and stripped out :(
Clio_GTT
11-02-2007, 17:35
erm, the bolts mite be fine,your overtightening them into an alloy head, its possible the thread in the bolts holes in the head has threaded and stripped out :(
thats what i meant by threaded, as coops says its made of alloy so is softer than the bolts :(
ah crap :p
they're still in tight.. just not as tight as i thought they ought to be :?
if the holes in the head are threaded? does that mean the head is fooked? or can they be repaired? :/
they could be repaired but prob easier to change the tops. think these can be changed separately
Can this bit be replaced then?
http://www.physix.org/cars/F7P%20CH.jpg
easy/hard to do?
i think there interchangeable need to check with stan or ben R. not to hard to do .
Lee Keefy
13-02-2007, 00:22
the pink bits hold the cams down,you'd have to take the belt of the pulleys to replace these as the valve springs will push the cams up..
they also have a specific torque setting for both sets of bolts :)
but can you change them between heads
Lee Keefy
13-02-2007, 00:27
yes but just to be sure i'd put a thin layer of gasket sealer between just to be on the safe side...
they're meant to fit flush but i dont trust anything like that!!!!
it cant hurt and saves time when it leaks :wink:
i wasn,t sure if they were like blocks and main bearing caps
Lee Keefy
13-02-2007, 00:35
no,just the problem with them settling to a particular head thats why i thought i'd mention the glue.
i think once they've been warm for a while they'd settle on the head 8)
looks complex :?
Think i will just try some of this gasket sealant instead :D
Nick Hill
13-02-2007, 01:22
The part you have highlighted in pink should be kept with the head it came from. DO NOT fit any from another head. The cam carriers (pink part) is align bored to the head when the two parts are assembled so you have a perfect bore for the cam to run in. Machining tollerances nowdays are very good but the slightest of mismatch will make the cam tight when spinning in the head. If you have a thred that has pulled it can be drilled and helicoiled. Is the rocker gasket leaking or were you just curious on the torque. I have found that the rocker gaskets seem to settle after a few k and just need nipping up .
it's leaking.
I took it off to inspect the gasket i put on ~6k miles ago.
When tightening it up, I noticed the one or two i tried to tighten .. didn't.
Didnt do it on all, incase I was breaking something.
But its still leaking.
so they are like blocks and main bearing caps. 8)
Laine_16v
13-02-2007, 03:25
one of mine rounded! :?
And one of mine is too, hopefully dont need to take the cover off in a while tho!
Lee Keefy
13-02-2007, 13:40
The part you have highlighted in pink should be kept with the head it came from. DO NOT fit any from another head. The cam carriers (pink part) is align bored to the head when the two parts are assembled so you have a perfect bore for the cam to run in. Machining tollerances nowdays are very good but the slightest of mismatch will make the cam tight when spinning in the head. If you have a thred that has pulled it can be drilled and helicoiled. Is the rocker gasket leaking or were you just curious on the torque. I have found that the rocker gaskets seem to settle after a few k and just need nipping up .
so where have i gone wrong then????
i've just fitted a set of new cams and followers (piper) together and used the same cam holders with loads of lube and mine are tight as hell???
any help would be grately appreciated as the head will be goin back on thursday :?
Nick Hill
13-02-2007, 21:42
Cams and followers? If you have fitted the valves ,springs and followers into the head and then fitted the cams the camshafts are opening the valves so they will be harder to turn. Take the followers out and just fit in the cams (they should clear the valves and springs) if the cams are tight then you do have aproblem of some sort that will need looking into.
Lee Keefy
13-02-2007, 22:13
i know they will be hard to turn cos i'm workin against the valve springs but these seem overly tight!
strip them down again and check nothing is untoward with the bearings on both upper and lower half,s. then remove tappets and try again. if there still tight maybe the parts are damaged.
Lee Keefy
13-02-2007, 22:22
i were almost surgically clean puttin them in and everything seemed fine untill i tried lining the cams for the belt...
i just put it down to them bein new an not bedded to the head :?
even new/different cams should have the right clearance and should turn freely. if they don,t these likely to be a problem. i would re check. cheaper than a problem once you have tried to start the engine etc.
Lee Keefy
13-02-2007, 22:28
ive already done that with a resultin headgasket failure due to penny pinchin on an ebay headset :oops:
if your not sure when its stripped again post some photo,s up. also have you measured the old and new cam bearing journals just in case there,s a difference
where can I get gasket sealant from?
Also, for re-threading the holes in the cylinder head, where would i go to get this done? can it be done without taking it to bits?
Lee Keefy
13-02-2007, 22:46
stripped now but feel like lettin nature take its course with the b**stards
they'll either free up or else!!!! :x
matt. will need to remove the pink bits and take them to an engineering shop. this would be my last course of action though. first get the right sized tap and tap the holes. make sure the threads are really beyond repair. also try new bolts after tapping the threads. also maybe use a bit of stud and bearing fit. its a liquid.
Are they high lift cams lee? This might not help. Are they tight all the time as Nick says when the followers arent in?
Bit of a tangent to the thread. Matty you should really use a new gasket each time you have the cam cover off as it may not sit right and will be crushed after removal, Also if the bolts only go fairly tight but keep turning then the threads in the cam ladder will almost certainly be stripped, if so helicoil time! I also tend to use some non setting sealant between the ladder and the head just to make sure it doesnt
Lee Keefy
13-02-2007, 23:29
Are they high lift cams lee? This might not help. Are they tight all the time as Nick says when the followers arent in?
Bit of a tangent to the thread. Matty you should really use a new gasket each time you have the cam cover off as it may not sit right and will be crushed after removal, Also if the bolts only go fairly tight but keep turning then the threads in the cam ladder will almost certainly be stripped, if so helicoil time! I also tend to use some non setting sealant between the ladder and the head just to make sure it doesnt
yes but the're not a mad profile :?
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