Guardian Technologies 4456, 4390 Test 62 Check and Adjust Valves, Test 63 Check Fuel Regulator

DC CONTROL

PART 4

SECTION 4.4

DIAGNOSTIC TESTS

9.Heat the oil in the container. When the thermometer reads approximately 274°-294° F. (134°-146° C.), the VOM should indicate CONTINUITY.

RESULTS:

1.If the switch fails Step 4, or Steps 8-9, replace the switch.

2.If INFINITY was NOT measured in Step 5, repair or replace Wire 85 between the Circuit Board and the High Oil Temperature Switch.

4.When the valve clearance is correct, hold the pivot ball stud with the allen wrench and tighten the rocker arm jam nut. Torque the jam nut to 174 inch pounds. After tightening the jam nut, recheck the valve clearance to make sure it did not change.

5.Re-install the rocker cover gasket, rocker cover and the four (4) screws.

RESULTS:

Adjust valve clearance as necessary, the retest.

TEST 62 - CHECK AND ADJUST VALVES

DISCUSSION:

Improperly adjusted valves can cause various engine related problems including, but not limited to, hard starting, rough running and lack of power. The valve adjustment procedure for both the single cylinder and the V-twin engines is the same.

PROCEDURE (INTAKE AND EXHAUST):

Make sure that the piston is at Top Dead Center (TDC) of it s compression stroke (both valves closed). The valve clearance should be 0.05-0.1mm (0.002- 0.004 in) cold.

Check and adjust the valve to rocker arm clearance as follows:

1.Remove the four (4) screws from the rocker cover.

2.Remove the rocker cover and rocker cover gasket.

Figure 29

3.Loosen the rocker arm jam nut. Use a 10mm allen wrench to turn the pivot ball stud and check the clearance between the rocker arm and the valve stem with a flat feeler gauge (see Figure 29).

TEST 63 - CHECK FUEL REGULATOR

DISCUSSION:

The fuel regulator is rarely the cause of a HARD START or NO START condition. The most common causes are insufficient fuel pressure supplied to the unit, or the adjustment screws on the fuel regulator being out of adjustment. The fuel regulator is an ON DEMAND type. During cranking and running, negative pressure from the airbox or carburetor unseats the fuel regulator diaphragms and allows fuel flow through the regulator.

PROCEDURE:

Note: Step 1 of this procedure pertain to V-twin engines only. Single cylinder engines begin at Step 2.

1.If the adjustment screw settings are in question, reset as follows:

a.Turn adjustment screws clockwise all the way in, then turn out counterclockwise two and one half full turns. This will provide a starting point for further adjustment.

2.Turn off utility power to the main distribution panel in the house. This can be done by switching the service main breaker to the OFF or “Open” position.

3.Allow the generator to start. Before loading the generator, confirm that the No Load Frequency, with the roof open and the door off, is set to 63-63.5 Hz. Transfer load to emergency circuits.

4.Turn on appliances. lights, pumps, etc., that are on the emergency circuits in an attempt to fully load the generator. Be cautious not to overload the generator. Use the following chart as a guide:

Unit	120 Volts	240 Volts
7 kW	50.0 amps	25.0 amps
12 kW	100.0 amps	50.0 amps
15 kW	108.3 amps	54.1 amps

5. When full load has been achieved, connect a frequency

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