Just a note: I could not tell the stems were bent until I removed the head completely and had stripped the springs etc ....not saying that is always the case, just my inbuilt bad luck
As vales rotate the very slight bend would have worn the stems over time causing wobble/oil use etc so I should be glad that they were out of true enough to show I suppose
I'd be tempted to just try the follower first but that largely depends on your attitude to risk. Far simpler and so what if it goes again? Then do a full strip.
Maybe the broken piece somehow wedged the valve spring. Depends on how it was sitting when you found it.
You don't even have to put the cam cover on. You could swap the follower out and do a compression test!
mickthemaverick wrote: 04 Dec 2025, 15:04
I might have to claim the win on that one!!
Ahem, I may be late to the party but was my guess not the exact part we see failed? *dodges potential return bunfire*
Not that this is necessarily the whole issue, but still strange to only see one follower failed. Low compression would result from the piston effectively attempting the "suck" part of "suck squeeze bang blow" through a closed intake valve, and fuel would still be in the chamber since it's a direct injection engine (even if it was an IDI diesel the injectors are "downstream" of the valves, in the pre-chamber).
I'd honestly give this a fair shot at being a simple rocker failure at this point, has to be worth a shot replacing it and seeing if compression returns?
Edit- having read page 11 now, nothing wrong with borescoping it but if the valve is only minutely bent it's liable to be invisible to the eye. Even if there is a witness mark suggesting it's contacted the piston I'd still risk just doing a rocker and see if it lives.
Last edited by ekjdm14 on 05 Dec 2025, 17:12, edited 1 time in total.
No idea if this is possible, never played with PSA engines that deep (only Kwaks), can you remove the cams which will close all valves then use compressed air, (tyre?) into the cylinder to see if it leaks?
Pete
Notice the BX is still top the list but sadly gone
I trust all is back to normal now 
*dodges potential return bunfire*
Thinking outside of the box is better than sitting in a dark one.
