Hello to all, I am currently in the process of replacing a bent intake valve on a Retona diesel and I need to know the valve clearance for this particular engine. On the side of the engine block is stamped RF and below the RF letters is J5. On the side of the engine head is stamped the letters RFG. I think this is a Mazda RF engine so I checked online for a service manual. I was able to find one but it is for a rocker-arm type and this engine that I am working on is of the cam-follower type. I need information from someone who knows the valve clearances and the torque specs for this engine. By the way, the bent valve was because the timing belt broke and the owner, not knowing what happened, kept on repeatedly cranking the engine until he got fed up and then called up a towing service.