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TROUBLESHOOTING & REPAIR | ||
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ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.4 - BLOWER PADDLE MARKED FOR STROBE-TACH METHOD
MARK |
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TEST PROCEDURE
This test can be conducted by any of three methods.
Strobe-tach Method:
1.Stop the engine and remove the spark plug wire to prevent acciden- tal kickback or starting.
2.With the black or red marking pencil, place a mark on one of the blower paddles, which can be reached through the vent slots in the end bracket. See Figure F.4.
3.Connect the
4.Reconnect the spark plug wire and start the engine. Direct the strobe- tach light on the blower paddle and synchronize it to the rotating mark. The tach should read 3700 RPM.
5.Loosen Wing Nut (Refer to Figure F.5)
6.Refering to Figure F.5, adjust high speed stop screw until tach reads 3700 RPM.
7.
Frequency Counter Method:
1.Plug the frequency counter into one of the 115 VAC auxiliary recepta- cles.
2.Start the engine and check the frequency counter. At the proper RPM (3700), the counter should read 63 Hz.
3.Loosen Wing Nut (Refer to Figure F.5)
4.Refering to Figure F.5, adjust high speed stop screw until the frequency counter reads 63Hz.
5.
Oscilloscope Method:
1.Connect the oscilloscope according to the manufacturer’s instructions. At 3700 RPM, the waveform should exhibit a period of 15.8 milliseconds. Refer to the NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM (115 VAC SUPPLY) HIGH IDLE - NO LOAD in this section of the manual.
