ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines - 005-079 Pumping Control Valve

Click Test
Cutout Test

Click Test

TOC

Use INSITE™, with the keyswitch in the ON position, to run the control valve click test.		SMALL \| MEDIUM \| LARGE

Select the Pumping Control Valve to be tested to initiate the test. Select either front control valve or rear control valve.

A “click” will be heard until the other pumping control valve is selected, or None is selected on the Control Valve Click Test screen.

If no “click” is heard, troubleshoot any active fault codes.

NOTE: The click test will need to be performed after any repairs are made to clear the fault codes.

SMALL | MEDIUM | LARGE

Cutout Test

TOC

The plunger cutout test can be used to check performance of the front and rear pumping plungers.

NOTE: When performing this test, the engine load must be the same when each pumping plunger is cut out.

Use INSITE™, with the engine running at idle, to perform this test.

SMALL | MEDIUM | LARGE

Select the pumping control valve to be cut out.

Select the monitor button and monitor valve close angle, engine speed, and accumulator pressure while the selected plunger is cut out.

Record valve close angle, engine speed, and accumulator pressure after the engine stabilizes.

After testing with one pumping control valve disabled, select “None” so that the engine will run with both valves enabled. Switching directly from “Front” to “Rear” or “Rear” to “Front” will cause the engine to misfire or hesitate.

Cut out the other pumping control valve, and record valve close angle, engine speed, and accumulator pressure after the engine stabilizes.

Compare the results when the rear pumping control valve is cut out, against the results when the front pumping control valve is cut out.

If the engine dies when one of the pumping control valves is cut out, replace the accumulator. Refer to procedure 005-085.

NOTE: The valve close angle must not vary more than 15 degrees crank angle.

If the valve close angle varies more than 15 degrees between the front and rear valves then replace the accumulator module. Refer to Procedure 005-085.