How does this happen? (valves)

[Acidburn]

I'd say possibly missed gear = over rev and a couple of valves failed to get out of the way in time, If it was timing I would expect to see a lot more bent valves than just 2.

Stocious, remember, when a man points a finger there are three pointing back

gavin said it had only just been started up after sitting around, it was not on the road at the time unfortunately.

[Gavin A]

Another thing i thought was sticking of the valve, but it was free moving when removed and the stem is clean as per pics.

Why it bent them i know - belt was 4 teeth out (previous owner)

But i must say, some mention keyways on cam/crank - this wouldnt allow it to bend one valve in a chamber as the cam is a solid chunk and even if its independent from the crank it will still open 2 inlet valves in 1 chamber together.

[pasbogdan]

OH MY GOD - PLEASE DONT GET NASTY, everyone has an opinion and on a forum they are all welcome.

A weird one i know and i expect all sorts of theorys.

I realy think the lifters could be part of this- the car had only been running 3 mins since sitting for years, but they had gone quiet (a detail i missed sorry)

So you do not know why they bent?When taken head off from the car cecked timing?

[pasbogdan]

Then stop this circus.Piston hit valves because timing.Valves hit followers and some followers lost oil when hit and others did not lost oil and bent valve.Simple.

[newsh]

Why it bent them i know - belt was 4 teeth out (previous owner)

Another detail you forgot to mention?

[Gavin A]

Ok thats a fair theory, and im happy with it, but i have never seen a car do this and i have probably sorted over 100 valve bends in my years.

I will now thank the other kind lifters for saving the other valves!

[Gavin A]

Newsh - the question was not why it bent the valves but how only 1 can bend on a dual lift cam

[pasbogdan]

Ok thats a fair theory, and im happy with it, but i have never seen a car do this and i have probably sorted over 100 valve bends in my years.

I will now thank the other kind lifters for saving the other valves!

As i said before:Valves perpendicular on piston usualy get unharmed but can damage follower.On 1.9 tdi valves closed 100% after breaking belt and putting other for testing compresion.But upper part of some followers was cracked.

[newsh]

Ok, but "valves hit piston, all good, due to timing being 4 teeth out" would have saved a page and 15 minutes of our collective lives, not to mention the emotional flak

[Gavin A]

Sorry, i was going to correct but pasbogdan stated early in pg 2 "he knows why it bent the valves" sorry my bad.

I should have written more detail - forgot it was friday night and people were looking for action

[pasbogdan]

I got it from the begining that he knows what caused that.
And forgot to mention: put all valves including ones that seem straight in a precision turning device(NOT lathe chuck)or drill mandrel and i guess you will have less followers to thank to

LOL you have seen too that i got the things.
This evoluated so funny LOL

[Gavin A]

LOL that you know i used a lathe chuck!

(newsh, i did reply in the sport quattro thread btw, infact i posted pics )


Wish i has seen this earlier too (new to forum) -

[pasbogdan]

That can make you change all valves because not beying able to center them good.Or beying forgiving at to many valves thinking it is valve in chuck that is not centered.
I use a small lathe with a part 7mm inside and a cone outside that get in lathe axle.How do you call that?

[Gavin A]

The others look good, i did consider bolting head down with old head bolts/new gasket and fitting belt and checking comp before fitting it all up, this will only cost a pattern head gasket and under an hour.

[pasbogdan]

Not worth.Head is already down.Check all valves,rework head and be 100%shure.