New poster! (less than 10 posts)
Here is an odd one, recently the liner cracked on cylinder 1 (water pump. i know it should be the other way around but hey)
so i've taken the piston and liner out and thought while i'm at it i'll replace the seals on the others and inspect them just to be sure!
pistons 1 and 4 are fine
piston 2 and 3 have marks on them where a valve must of hitting it but this was hidden under carbon build up there is about .1mm of a lip on it. on piston 2 the mark is on the right hand side and on the left on piston 3
now my head is fine and there is no signs of damage on said valves
what could of causing this? all the pistons have the same stampings on them, so i assume the are a matching set.