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Old 10-07-2003, 01:13   #1 (permalink)
Chasing 500rwkw
 
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confused Please help! Valve troubles.

Today i finally got off my arse to see why my XF is running like complete crap and making funny noises. About a month ago My carby bolt broke and i suspected it fell into the engine.
I took off the intake and saw nothing. Then i took off the rocker cover and found a pushrod on its own not attached to a rocker arm.

I put it back under and tried to tighten the rocker down but the rocker stayed loose. So i took the rocker off and undid a sparkplug and had a look the valve is stuck open I think.

If there is no rocker arm then the valve should close shouldnt it?I think the lost bolt has got stuck keeping the valve open.

So my question is how do i push that valve down to hopefully drop the bolt down so the valve can close. I tried pushing but the double valve springs dont budge. I'd rather not take the head off if i can.

Thanks guys.
Dan
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Old 10-07-2003, 09:12   #2 (permalink)
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Re: Please help! Valve troubles.

u can tap the valve spring retainer gently with a hammer but if there is something jammed between the valve and valveseat then u'd be very lucky if the valve isnt bent. also it may not drop down once the valve is open as i've seen foreign "bodies" embed themselves into cylinder heads, combustion chambers and valve ports - thats an unfortunate side of alloy, it's soft
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Old 10-09-2003, 01:34   #3 (permalink)
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Re: Please help! Valve troubles.

i think the only thing you can do is pull the head off, because if the valve is stuck open by something, odds are that the valve will be bent by the pressure+speed with which the valve springs were attempting to slam it home while the bolt or whatever prevented them from doing so...

if the bolt has only gotten to there i think you should thank your lucky stars, if it had of gotten that extra 8mm or so it would have made it into the combutsion chamber and bounced up and down in there about 1,000,000,000,000,000 billion times (ok i might be exaggerating...) and busted your piston - if its a cast piston it might have shattered and then you would have a conrod poking out the side of the block- the head, probably both valves etc...

at the moment it might be possible to just put in a new valve and valve seat, and helicoil the rocker bolt thread (it sounds like its stripped?)

how big is the bolt? would it fit out of the spark plug hole if you managed to dislodge it from the valve? you could try that and just hope it its not stuffed, but 99 million to one that it is.
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Old 10-09-2003, 01:43   #4 (permalink)
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Re: Please help! Valve troubles.

With vertually zerro deck height apart from combustion chumber you'd have to be so lucky not to do any damage.You'll have to take the head off....
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Old 10-09-2003, 05:34   #5 (permalink)
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Re: Please help! Valve troubles.

Head will be off tomorrow.
Doesnt matter anyway, an eight will be going in its place very soon.

Thanks guys
Dan
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