What are the valve actuators on a cat C15 Acert?
Refer to Specifications, “Variable Valve Actuators” for the proper torque for the jam nut. Turn the crankshaft clockwise by 360 degrees. This will position the No. 6 piston at the top center on the compression stroke.
Where does the valve lash measurement take place?
Note: Valve lash is measured between the rocker arm and the valve bridge. All measurements and adjustments must be made with the engine stopped and the valves fully closed. An adjustment is not necessary if the measurement of the valve lash is in the acceptable range in Table 1.
How do you adjust the valve lash on a car?
Use the following procedure to adjust the valve lash: Put the No. 1 piston at the top center position on the compression stroke. Refer to Testing and Adjusting, “Finding Top Center Position for No. 1 Piston”. Adjust the valve lash according to Table 2. Lightly tap the rocker arm with a soft mallet.
How do you adjust the vavles on a cat C-13 engine?
Place the appropriate feeler gauge between rocker arm and the valve bridge. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the rocker arm and the valve bridge. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge. Remove the feeler gauge.
Where is the feeler gauge on Cat C15 Acert?
Refer to Specifications, “Variable Valve Actuators” for the amount of lash. Place the feeler gauge between the piston pin and the rocker arm. Note: The inlet rocker arm must be in contact with valve bridge (4) when you set the lash for variable valve actuators.
How does the intake valve actuation system work?
The Intake Valve Actuation system (IVA) uses pressurized engine oil to delay the closing of the intake valves. The system is controlled by the Engine Control Module (ECM). The system contains the following components: Check Valve (53) – Pressurized engine oil flows to a rail inside the valve cover base.
What does the IVA do on a C15?
The IVA does not have enough power to overcome the initial seat pressure of the valve springs. It does however have enough staying power to hold the valve open during the start of the compression stroke letting some of the intake charge to flow back into the intake and “pre heat” it for better combustion.