Thanks HJP - has anyone any experience of replacing a valve spring without removing the head? - I've heard some engines have tools available for this
Marc
A valve spring broke on mine (4/4s do go wrong occasionally!) many years ago just after I'd had the engine rebuilt. The guy who'd done it came out to my place and replaced the spring very much like this video as far as I remember.
https://www.youtube.com/watch?v=LucpQbaGtN0 It took him about five minutes.