gerard,
good questions!
first off the timing chain / gears . timing chains do stretch. but the
teeth of the gears also wear. quite frequently the chains and gears wear in
a specific "matching" pattern. now frequently a chain could be replaced
without replacing the gears. but this can lead to premature wear on the
chain if the gears are worn and not detected. for the depth of the
operation it would be a good idea to replace all related wear items to
properly restore the timing of the cam in relation tothe crank.
now the balancer. unfortunatly balancers get a lot of abuse being
improperly hammered on and off (not using a puller and installation tool) ,
getting hit on floors and frames diring instalations and removals. now the
biggest problem is the elastometer material between the center piece that
attaches the assembly to the crank and the outer ring(piece that has the
timing mark on it) usually gets tired or oil soaked and swells out or tears.
this makes the balancer run out of true. it may partially function in it's
dampening job but is in danger of throwing off the outer piece.
indications of the elastometer material (rubber piece) pushing out of the
area it is cast in or severe cracking and bits hanging out are the beginning
of the end for a balancer. also, the higher the performance expectations
the more critical that the balancer is free of defects. to the naked eye a
balancer that no longer runs "true" may look alright. it can be detected
during crank shaft balancing by a competent machinist before the crank can
be balanced.
chuck.
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/// (If they are dupes, this trailer may also catch them.)
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