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TROUBLESHOOTING AND REPAIR |
ENGINE THROTTLE ADJUSTMENT TEST
ROBIN/SUBARU ENGINE (continued)
FIGURE F.4 - MARK LOCATION
MARK |
|
TEST PROCEDURE | Frequency Counter Method: |
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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 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.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.Using the 10mm socket wrench, slightly loosen the throttle locking nut. See Figure F.5.
5.Using the screwdriver adjust the high speed stop screw until the tach reads 3700 RPM. See Figure F.6.
5.
See Figure F.5.
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.5.
4.Using the screwdriver, adjust the high speed stop screw until the fre- quency counter reads 3700 RPM.
See Figure F.6.
5.
See Figure F.5.
Oscilloscope Method:
1.Connect the oscilloscope according to the manufacturer’s instructions. At 3700 RPM, the waveform should exhibit a period of 16.2 milliseconds. Refer to the NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM (115 VAC SUPPLY) HIGH IDLE - NO LOAD in this section of the manual.
