Vibration is a sign of a problem with a
machine. One of the engine components that is important to check is the timing
chain, which has a usage limit of 150,000 km. The impact on motorbikes if
vibrations in the timing chain are ignored, it can cause the timing chain to
loosen and wear out. The author aims to determine the acceleration of
vibration. The method used is an experimental research method on 0 Km and
150,000 Km timing chains combined with St.37 iron mass with 3 variations, 1
mass, 2 masses, and no mass tested using the mode of shape tool. Data
collection is carried out by comparing directly through comparison charts and
will use the description method to explain the results obtained. The results of
the experimental study of the 150,000 Km timing chain chain have a very high
vibration acceleration value, because it has undergone deformation and has a
greater modulus of elasticity, and has a stiffer shape. As for the differences
between each variation, the massless variation has a high vibration value and
is unstable because in this variation there is free vibration. Meanwhile, in
the 1 mass variation, the vibration acceleration value obtained appears more
stable and lower because this variation uses 1 load (SDOF). Meanwhile, in the 2
Mass variation, the acceleration results obtained are much more stable because
this variation uses 2 loads (MDOF). As a result, the timing chain becomes loose
and worn so that it has less grip on the gears, and if left too long it will
come off the gears. As a result, it can cause components in the engine to be
completely damaged, such as bent valves, broken valve bushings, and scratched
pistons, even worse, holes can occur, and can also spread to several other
components such as timing gear, timing chain, tensioner, chain guide, camshaft
gear.
Keywords:
Maintenance, Vibration, Timing Chain, Mode of Shapes Analyzer, Empiric