The four valves per cylinder – two intake and two exhaust – were actuated by roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms (which actuated the valves). I am also a XR4155 owner, haven’t experienced any issues yet (only 55 hours) but am very interested to find out what it takes to fix yours.003 No Code – GPS Receiver is not powered. Foreword The descriptions and service procedures contained in this manual are based on designs and methods studies carried out up to September 10. Ls tractor code f02 Cold start system not being used, or malfunctioning.
