The automatic drive belt tensioner (6B209)
can be checked as follows:
With the engine running, observe drive belt tensioner movement. The drive belt tensioner
should move (respond) when the A/C compressor cycles or
when the engine is accelerated rapidly. If the drive belt tensioner movement is
constant and excessive, a pulley or shaft is probably bent or a pulley is out
of round. In rare cases, excessive drive belt rideout (uneven depth of grooves
in drive belt (8620)
) can cause excessive drive belt tensioner movement. This
condition can be checked by replacing the suspect drive belt
with a known good original equipment drive belt
and repeating the observation.
With engine off, check for proper drive belt routing. Refer to the
illustrations under Removal and Installation. Service as required.
Visually inspect the drive belt tensioner wear indicator as outlined, to
ensure the drive belt
is within operating range. Replace the drive belt
as required.
Rotate the drive belt tensioner
and check for a binding or frozen condition. Replace drive belt tensioner
as required.