Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1426 / 1956

PAGE 18
Feb 28/07
7G4
74-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
G. Installation
WARNING: BE SURE SWITCH IS IN OFF POSITION AND THE P LEAD IS GROUNDED.
When installing new or adjusting breaker points and before timing the magneto to the engine, it is
important that the internal timing of the magneto be correct. To find number one tower, the following
instructions should be performed:
NOTE: No need to spark out these magnetos.
(1) Insert the T - 118 timing pin in the L or R hole in the distributor block (depending on rotation of
the magneto).
(2) Turn rotor opposite the rotation of the magneto until the pin engages the gear.
(3) If the pin is binding and will not go in the hole in the gear, you have hit the pointer on the gear.
Pull the pin out, enough to continue opposite rotation until the pointer has passed, re-insert
pin.
(4) When the pin sticks through the hole in the gear about 1/4 inch, you are now ready to fire
number one cylinder.
(5) Turn the engine crankshaft in the normal direction of rotation until the No. 1 cylinder is in the
full-advance firing position.
(a) Cover spark plug hole of number one cylinder with thumb. Rotate crankshaft until
pressure is felt on thumb.
(b) Remove plug in front of number six cylinder. Rotate crankshaft slowly to observe timing
mark on alternator drive gear. When the mark on the gear is centered in the viewing hole,
number one piston is at 20° BTC.
NOTE: Verify correct engine timing for the airplane being worked on by checking the
engine dataplate.
(6) Place a new gasket on magneto flange. Install magneto carefully so drive coupling lugs mate
with slots of drive bushings. Install holding washers, lockwashers, and nuts.
NOTE: Do not tighten completely. Allow for turning magneto for final timing.
(7) After the magneto is installed on engine, remove the timing pin. The magneto is now ready to
be timed to the engine.
(8) Complete magneto to engine timing procedure listed under 100 Hour Inspection, above.
WARNING: THE MAGNETO IS NOT INTERNALLY GROUNDED, WHEN THE GROUND
LEAD IS DISCONNECTED THE MAGNETO IS HOT. REMOVING THE
HARNESS ASSEMBLY FIRST AND INSTALLING IT LAST, MINIMIZES THE
DANGER OF STARTING THE ENGINE ACCIDENTALLY WHEN THE GROUND
LEAD IS REMOVED FROM THE MAGNETO.
(9) Replace the harness cap onto the magneto. Align the index marks made on the harness cap
and distributor housing when removed.
(10) Connect the P-lead and pressurization tube to magneto. Connect the retard breaker lead to the
starting circuit to the left magneto.