Teledyne Continental Motors, Inc.
TM
Maintenance and Adjustments
IOF-550 Permold Series Engine Maintenance Manual
9-27
1 April 2007
9-7.3. Drive Belt Tension Check and Adjustment
IOF-550 engines may be fitted with an optional belt driven Freon compressor or belt
driven alternator. Belt tension is critical to the function of these optional devices. The
initial tension will loosen during the first five hours (break-in) of engine operation after
the new belt is installed. Check the belt tension after the break-in period and during
subsequent visual inspections.
9-7.3.1. Freon Compressor Drive Belt Tension Check and Adjustment
Procedure
1.
Inspect the drive belt for obvious signs of wear, nicks, or cracks; replace if necessary.
2.
Check the belt tension at the point indicated in Figure 9-15 with a direct reading
tension gauge (50 to 70 pounds) or measure belt deflection with a five pound load at
the center of the longest belt span for 0.30 to 0.40 inches of deflection. If deflection is
within tolerance, document the inspection results. To adjust belt tension, proceed to
the next step.
NOTE: One full turn of the adjustment bolt yields approximately
10 pounds change in tension.
3.
Loosen the jam nut on the idler pulley. Tighten the adjusting bolt to increase tension,
loosen the adjusting bolt reduce tension. When properly adjusted, secure the adjusting
bolt with the jam nut and torque according to Appendix B specifications.
MEASURE BELT
DEFLECTION HERE
MEASURE BELT
DEFLECTION HERE
Figure 9-15.
Freon Compressor Belt Tensioning
