Valves Not Shutting Fully?

[pugpete1108 62 1 Cars]

ive put the cams (xu7 ones) back in today and gave each cam a few revolutions to settle things but have found two valves are not shutting properly ?

 

1 exhaust and 1 inlet

 

is this just a case of the valve getting stuck in the guide? i did oil them liberally before fitting. should they settle in after some more turning or do i need to remove the cams to investigate?

 

 

 

cheers

[Tom Fenton 1,541]

Is this a serious question? If they do not shut against spring pressure then yes there is definitely a problem.

[pugpete1108 62 1 Cars]

yeah im afraid it is tom youll have to forgive my retardedness but this is my first real attempt at rebuilding a head so am a little dubious.

 

it seems i may have answered my own question as ive rotated them a few more times and the are all now closing fully.

[welshpug 1,657]

have you confirmed they are straight? they are original to the head right?

[pugpete1108 62 1 Cars]

yup, after all the f*cking about with seals and whatnot i decided to fit all the original parts back on. and yes the valves all moved freely when fitted in the shafts. and as far as i know they are straight. (well they were fine before i removed them)

[ORB 227 1 Cars]

That's some rather pink paint going on there.

[pugpete1108 62 1 Cars]

It's not pink I tell you, it's called boho

[Paul_13 212 1 Cars]

Might be the lifters still have pressure in them. We had the same problem when rebuilding a mates engine. They settled down after a few rotations and dropped back to normal

[welshpug 1,657]

I just re-read what you posted, didn't realise you were fitting the cams, 4 valves will be open with the cams in and pinned, though should be the same amount for each pair! as Paul said, probably the lifters not settled.

[kyepan 291]

as Paul said, if you refilled the lifters make sure they are fully compressed, ie depressed pistons before fitting. otherwise you will get open valves

[kyepan 291]

as Paul said, if you refilled the lifters make sure they are fully compressed, ie depressed pistons before fitting. otherwise you will get open valves, that said I can see that two valves on the inlet side of the same cylinder are open a different amount, both inlets should be open the same amount.. so i think Paul is right

[pugpete1108 62 1 Cars]

I did notice some if the inlets were at different heights when opened.

 

So this should sort itself out after a few more rotations or should I remove the lifters and compress them?

 

What if I didn't fill all the lifters properly before fitting them, will that me a massive problem or will it right itself.

[kyepan 291]

overfill is worse, under fill will sort itself

[kyepan 291]

mine all looked closed, but we had no compression when cranking, I suggest you compress them fully, but not drain them.

[Josh_Quant 27]

yeah im afraid it is tom youll have to forgive my retardedness but this is my first real attempt at rebuilding a head so am a little dubious.

 

it seems i may have answered my own question as ive rotated them a few more times and the are all now closing fully.

 

Quick question did you re cut the valves in?

 

I know it got nothing to do with them staying open of course but if its your 1st building a head just trying to help!

[pugpete1108 62 1 Cars]

 

Quick question did you re cut the valves in?

 

I know it got nothing to do with them staying open of course but if its your 1st building a head just trying to help!

 

yup i did, but thanks for the concern

[pugpete1108 62 1 Cars]

mine all looked closed, but we had no compression when cranking, I suggest you compress them fully, but not drain them.

Just use a g clamp to push the piston back as far as it will go then refit?

[kyepan 291]

i would say, disasemble, depress the ball valve to bottom them out, then refit.

 

If you use the gclamp - make sure you protect the surfaces of the lifter from marks, as they should be well finished.

[pugpete1108 62 1 Cars]

Just had the inlet off, a few of the followers were nigh on rock solid, depressed them using a clamp and a socket to protect the end.

 

Got a couple of drops of oil out and some air refitted and they are all level with each other.

 

Just got to do the exhaust now.