valve lash

P

playnotwork

Member
been messing around with the valve lash on a old 160. took the rocker cover off and free revved to a max of 6200 rpm. With the rocker cover off and liitlle oil splashhing around adjusted the inlet and oulet rocker retaining nut salterteratively going backwards and forwards until got max revs. this maxxed out about 6700rpm. Then pushed a little to far and the cam sheared off and lost the lash setting. not to bothered about the old engine but was just surprised that the lash setting had such an effect on rpm. . lash was definatly loser than 0.003 that i usaully set.
is this more power being released?
 
What do you mean by the cam sheared off? Are you saying you broke the cam, or that you wiped the lobes off the cam by playing with valve lash?
 
W5R said:
What do you mean by the cam sheared off? Are you saying you broke the cam, or that you wiped the lobes off the cam by playing with valve lash?
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not quite sure what happened, but the conrod snapped, the locating hole the where the camshaft sits was missing, the cam and crank had mashed teeth and the cam came throught the caseing, just below the cam follwers. All in All Knackered
 
All kinds of problems, you upset the lubriction system by removing the valve cover, no resistance on the push rods will cause the lifters to flutter all over, fly up collide with the block, there is nothing to help the tappet follow the cam, you most likely seized it up by over revving. Your test is not valid RPM , without producing torque does nothing but make noise. You are flling into the trap of everyone bragging how many RPM they turn, that is fine until you need to move a load.
 
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