Hes only doing a cylinder head (cuz new valves doesn't exist) propably incorrectly seat valves but i dont know.. But repaired it so... good for me.
All engine i take aparts and mount again by myself.... But now i regrets slightly... I can go to mechanic give him all engine and just wait for repaired... This process took me almost 6 months... (mostly because parts not avalible in our country) For new crankshaft i was wait almost 1,5month.