Valve Guide Issue

[Helm]

Just wondering if anyone else has had problems with Valve Guides moving in a motor with less than 100K

[Surge]

I'm curious, how can you tell that they are moving ?

[Helm]

in my case,Valve guide collapsed causing valve to stop operating and hence motor not firing on that cylinder. Only way to confirm is to remove head. I have been told that movement of the guide is fairly common with Subarus even whilst still under warranty and so was wondering what other peoples experience was

[dan_ashcroft]

What engine?

[BillyCorgi]

I have personally seen a "dropped" valve guide in a set of EJ25 SOHC NA heads that were holding one of the vavles open.

example
https://www.youtube.com/watch?v=Ac_p48YX3mU

[Helm]

Engine is a 2.5 litre non turbo petrol 100,000 km regularly serviced

[BillyCorgi]

I bought a pair of heads reportedly low kilometres and the seller did not mention anything about a dropped guide.
When stripping the heads I found the single dropped guide and made a punch and pushed it back home.
The heads are now installed on an engine and in the car and have not given any issues since.

I think that it would be much better if engine designers made their valve guides with a small step in the diameter so they could be inserted home against a shoulder?