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TROUBLESHOOTING AND REPAIR | ||
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ENGINE THROTTLE ADJUSTMENT TEST
ROBIN/SUBARU ENGINE (continued)
FIGURE F.7 – MARK LOCATION
MARK
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PROCEDURE
This test can be conducted by any of three meth- ods.
Strobe-tach Method:
1.Stop the engine and remove the spark plug wire to prevent accidental 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.7.
3.Connect the
4.Reconnect the spark plug wire and start the engine. Direct the
5.Using the 10mm socket wrench, slightly loosen the throttle locking nut. See Figure F.8.
5.Using the screwdriver adjust the high speed stop screw until the tach reads 3700 RPM. See
Figure F.9.
5.
F.8.
Frequency Counter Method:
1.Plug the frequency counter into one of the 115 VAC auxiliary receptacles.
2.Start the engine and check the frequency counter. At the proper RPM (3700), the counter should read 62 Hz.
3.Using the 10mm socket wrench, slightly loosen the throttle locking nut. See Figure F.8.
4.Using the screwdriver, adjust the high speed stop screw until the frequency counter reads 3700 RPM. See Figure F.9.
5.
F.8.
Oscilloscope Method:
1.Connect the oscilloscope according to the man- ufacturer’s instructions. At 3700 RPM, the waveform should exhibit a period of 16.2 mil- liseconds. Refer to the NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM (115 VAC SUPPLY) HIGH IDLE - NO LOAD in this section of the manual.