|I have recently purchased a 1995 Estrella, an import from Japan it is in good condition and I am enjoying it. I also bought a spare engine that was on ebay. I have started rebuilding this engine. I have noticed the following problems: 1 Camchain wear 2 severe wear on camshaft itself 3 severe wear on both rockers I noticed that the valve springs seem very strong?? (I also own a 1934 6cyl Wolseley with a 1600cc OHC Each bore works out at 266cc. so about the same as Estrella but the springs are about half the strength). Could this be a reason why the Estrella suffers from excessive problems with wear in the valve train?
The reason for the cam / rocker arm wear is the following:
• non-ideal material pairing for given load/ lift acceleration (arm should get hard block) • too low or zero oil pressure at speeds below 3000/4000 rpm with hot / thin oil • if clearance is too high wear increases rapidly (if too small exhaust valve prone to failure) • spring needs to be so strong due to accel loads induced by profile type