i bet its picked up on numbers 2 and 5 cam caps on there

mine did a similar thing, but only lightly scuffed the bearing and didn't damage it, cleaned it up with some 1200 grit and then washed it down with white spirits and all is good

just remember to put it back together wet - ie, with camlube or molygrease otherwise it'll do the same again within a few hundred miles.


yours looks like someone has removed the cams previously and either replced them dry or there has been a bit of dirt on the cap, so when replaced and started, its worked its way round


Also, the problem could be from someone putting the camcaps on backwards - IE, numbers 1 to 5 on the inlet and 6 to 10 on the exhaust, when they are supposed to be 1-5 on the exhaust and 6-10 on the inlet, with 1 and 6 been the roller bearing caps at the front of the engine