Lycoming TEO-540-C1A Maintenance Manual page 301

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
(2) Belt Tension Gage Method using Lycoming Belt Tension Gage (ST-131):
(a) Extend the hook on the Belt Tension Gage ST-
131 (Figure 2) to its extreme position by
depressing the handle.
(b) Put the hook over the alternator belt with the
nose piece centered on the alternator belt.
NOTICE: In the next step, release the handle of the
(c) Quickly release the handle of the Belt Tension
Gage (ST-131) and read the indicated belt
tension on the dial (Figure 3).
(d) Repeat the previous steps several times to ensure
an accurate reading.
(e) If the tension reading on the alternator belt is out
of tolerance, adjust the belt tension per the
"Alternator Belt Tension Adjustment" procedure
for the respective alternator in this chapter to get
the appropriate reading on the Belt Tension Gage
(ST-131).
C. Alternator Belt Tension Adjustment
(1) Cut and remove the safety wire from the bolts on the alternator adjusting link where
shown in Figure 4.
(2) Loosen the bolt that attaches the alternator adjusting link to the alternator (Figure 5).
(3) Loosen the bolt that attaches the alternator adjusting link to the crankcase.
Figure 4
Safety Wire on Bolts of
Alternator Adjusting Link
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November 2018
Belt Tension Gage (ST-131) quickly. If
the handle is released slowly internal
friction will cause an inaccurate reading.
Belt Tension Gage - ST-131
Belt Tension Gage (ST-131)
Figure 5
Alternator and Alternator Bracket
Figure 2
Figure 3
Indicator on the
72-70
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