Piper PA-34-200T Seneca II, Руководство по обслуживанию

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PIPER SENECA II SERVICE MANUAL
01/01/09 VIII - POWER PLANT
2B15
7. Breaker point opening may be checked by use of a suitable timing light. Tap the magneto case
with a non-marring hammer, counterclockwise (from the rear) to make certain the points are
closed. After the timing light indicates that the points are closed, tap the magneto lightly
clockwise until the points are open. Tighten the magneto attaching nuts.
8. Check timing by backing up crankshaft approximately 5 degrees and tapping gently forward
until the timing light indicates opening of breaker points. If timing is correct, the 20 degree
mark (midway between the 16 and 24 stamped on the crankshaft) will appear in the center of
the inspection hole. The crankshaft has punch marks in 2 degree increments with 16 and 24 at
each end. Tighten the magneto attachment nuts and replace the-plug in the inspection hole on
top of the engine.
b. LTSIO timing marks are on the outer edge of the crankshaft propeller flange. (Refer to Sketch B.)
1. Plug one spark plug hole of the No. 1 cylinder and place a thumb over the other plug hole. Have
a second person stand in front of the engine and turn the crankshaft in a clockwise direction
until pressure is felt on the thumb. No. 1 piston is coming up on the compression stroke.
2. Hold a machinist square so its base is along the crankcase vertical parting line above the
crankshaft and the arm of the square is pointing outward past the crankshaft propeller flange.
3. Turn the crankshaft clockwise until the 20 degree Before Top Center mark on the engine is
now in the advanced ignition firing position.
NOTE: Verify correct engine timing for the airplane being worked on by checking the engine
dataplate.
4. Remove the inspection hole plug from the magneto. Turn the magneto coupling unit. The
painted chamfered tooth on the distributor gear is approximately centered in the inspection
hole. Hold the magneto in its approximate installed position. Note carefully the position of the
coupling drive lugs.
5. Lubricate the gear support shaft with clean lubricating oil and install the drive gear assembly
so the slots of the coupling bushings will be in the approximate position for aligning with the
drive coupling lugs on the magneto.
Figure 8-15. Cast-in Timing Marks Figure 8-16. Fabricated Pointer