The preparation work before starting an CFR octane engine is very important, which needs the operator to pay special attention. Careful preparation will make subsequent octane testing more convenient and the results more accurate and reliable. Ignoring the preparation work may affect the normal use of the CFR octane engine and the octane testing process, and even affect the service life of the octane engine.
1. Check the jacket coolant level in the condenser sight glass.
2. Check the engine crankcase lubricating oil level in the crankcase oil sight glass.
3. Check the engine crankcase breather assembly to ensure it is clean and operable.
4. If an ice tower is used, fill the tower with ice. The depth of ice in the tower should not be allowed to be less than 920 mm (approximately 36 in.). If an intake air refrigeration unit is used, turn the switch on.
5. Adjust the cylinder height to ensure that the C.R. is low enough that severe knock is avoided when the octane engine is firing.
6. Lightly tap the fuel selector-valve knob in a downward direction using a screwdriver handle or other similar tool.
This will ensure the plug is not seized in the valve body when it is necessary to rotate the valve. (Warning—Avoid attempting to rotate the selector-valve knob if it resists turning. Rotation can score the plug and valve body and cause fuel leakage.)
7. Fill one of the fuel tanks with the selected warm-up fuel, and purge any air bubbles from the tubing and sight glass. Adjust the fuel level so that the engine will operate at approximately the fuel-air ratio for maximum K.I.
8. Open the cooling water valve or check that cooling water will be available for the coolant condenser when the engine is started.
9. Check that the octane engine ignition switch is turned off.
10. Manually rotate the engine crankshaft three or four complete revolutions to ensure that all parts move freely. Complete the cranking so that the flywheel is positioned at “TDC” on the compression stroke to minimize the load on the synchronous—reluctance motor when the engine is started.