DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 78 / 163

Maintenance Manual DG-808C
Issued: June 2005 4.17
g) Measuring the drive belt tension and tolerances
please refer to drawing W57 (enclosed in MM)
1. Remove the left (in sense of flight) drive belt cover.
2. Insert the measuring tool W57 from the right hand side (inside)
through the second threaded hole of the drive belt cover (counted
from the upper end). Lay the cord around the left hand side of the
propeller mount and fix it to the other side of W57.
Hang a min. 100N (10kg, 22lbs.) spring balance into the cord.
Measure the distance between the drive belt surface and the outer
side of the propellermount at the same station from the left hand side
through the opposite thread with the probe of a vernier caliper. First
measure with no load on W57 and then with 100N (10kg, 22lbs.).
3. The difference should be min. 6 mm (0.236 in.) and should not
exceed 11 mm (0.433 in.). If the difference is smaller than 6 mm the
tension is too high and the load on the crankshaft is excessive. If the
tension is too low the drive belt may slip and the relation propeller to
engine will change.
Option BBSA Slipping/centrifugal clutch: The drive belt tension
shall be lower: 8-12mm.
Caution: After installation of a new drive belt check the belt tension again after
approx. 30 minutes engine time, readjust if necessary.