Maintenance Hydraulic lash adjuster uses Engine oil pressure for its operation. In case of a freshly assembled Engine, do not run for a long time; there are chances of valve train noise / tappet noise appearing when the engine is started. HLA noise can be heard as repeated tappet like noise when engine is running at low idle speed. Following procedure is recommended to eliminate the noise. Raise the Engine speed to 500rpm without load • (Vehicle stationary) to bleed the hydraulic chamber of HLA. The noise should disappear in 15-30 seconds. If the noise still persists, run the engine further • under same condition (no load at 500 RPM) for several minutes. The noise should disappear in 3 to 30 mins, in few cases. In a very rare case if the noise is still heard, the • HLA is stuck in compressed position and has to be replaced. 6. Intake VCT and Exhaust VCT (Variable Cam Timing) The variable cam timing (VCT) control system controls the opening/closing timing of the intake valve and exhaust valve in accordance with driving conditions; improving engine output and reducing fuel consumption and emissions. The variable cam timing (VCT) controller adjusts cam shaft rotation relative to crank shaft rotation in accordance with amounts of oil in its oil chambers, controlling the opening/closing timing of the intake or exhaust valve. The amounts of oil in the oil chambers are managed by controlling the oil flow control valve in accordance with driving conditions. It improves the engine performance significantly, providing greater engine output, better fuel economy and reduces emission Solenoid Valve (Oil Control Valve) 7. The variable camshaft timing oil control solenoid is attached to camshaft and is hydraulically operated in order to change the angle of the camshaft relative to Crankshaft Position. The variable camshaft timing oil control solenoid is controlled by the control module. The control module sends a pulse width modulated 12 volt signal to a variable camshaft timing oil control solenoid. The solenoid controls the amount of engine oil flow. 1.2L REVOTRON CNG PHASE-2 ENGINE 84
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