3. Note: It may be necessary in engines with Thompson TF1900 fuel pumps to loosen the
four mounting nuts and let the fuel pump drop slightly in order to install the alternator.
If the governor drive adapter is installed under the pump, on Bonanza's with an hydraulic
prop, some metal may have to be removed from the governor drive flange nearest to provide
clearance.
4. Install alternator aligning the cut-out in the housing with the tach shaft drive
adapter. Install with new mounting pad gasket.
5. Install tach drive adapter and shaft, and safety wire in an approved manner.
6. Install RH magneto and time with engine.
7. Install air blast tube to the alternator. Be sure induction end is directed to
unobstructed slip stream. Good alternator cooling is a must. The 6560T Alternator is
equipped with a 2-inch blast cover opening, opposed to the 1-inch as used on the earlier
model. This improves cooling which is important especially in long engine idle periods.
8. Tighten fuel pump nuts.
9. Disconnect electrical wiring from generator voltage regulator and remove the voltage
regulator from its present location.
10. Install JASCO J12M20SP Voltage Regulator in the coolest possible area. It is
suggested that the regulator have a 1/4 inch flat spacers between mounting surface and
regulator to allow for air circulation.
11. For electrical hook-up, refer to the electrical schematic for voltage regulator and
voltage protector wiring and splices to alternator (see wiring schematic).
12. All workmanship and material to accordance with FAR43-13-2
13. With alternator (generator) switch "off", start the engine and operate at
normal run speed after activating switch to "on" position. Check rpm's and
ammeter for proper operation of the alternator.
14. Recheck and inspect the entire installation. Complete any necessary forms, make log
book entry, and add to the aircraft equipment list.
15. Correct drive Coupling Assembly.
Assembly of the Continental Gear Drive to the 6560T Alternator must be accomplished
without undue crush applied to the rubber blocks (632050 - Bushing). The tolerance
accumulation of the Drive parts and Alternator Shaft and Internal parts can amount to over
.040 inches. When the drive assembly is installed a wide range of pre-load could be
applied to the rubber blocks including extruding them out behind the gear.
SKYTRONICS suggests a pre-load on the rubber blocks of .005 to .008 inches. This can be
accomplished as follows; Assemble the Hub Rubber Blocks, Gear and nut in the shaft,
leaving out the retainer (668-2) which is .031 thick. Measure the clearance between the
rubber blocks and the gear with a feeler gage. Subtract this figure from the retainer
thickness (.031) and this will be the pre-load when the retainer is installed. If it is
greater than .005 - .008 machine the backside of the coupling, the difference between the
above-calculated figure and the corrected pre-load.
Care must be taken on the assembly that the rubber blocks are placed correctly in the
retainer. The radii on the blocks are towards the bottom corner of the retainer and
against the shoulder of the shaft. If the cotter keyhole will not line up, than shims must
be placed behind the nut to accomplish this.
