What is the intake valve actuator on ACERT cat?
An Intake Valve Actuator or IVA (also known as a Varible Valve Actuator or VVA) is a device that contacts the intake rocker arm and holds the intake valve of an ACERT Cat engine open in an effort to lower the cylinder temperatures of the engine.
Where are the actuators located on a cat engine?
The ECM sends a signal to the coil in order to fully open the spool. The oil is released into the space underneath the valve cover and the rail pressure is reduced. Actuator (54) – The actuators are located under the valve covers. Pressurized engine oil flows from the rail to each actuator.
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’s the problem with actuator valve on C15?
The main big problem with the actuators is they break studs. Then they bang on the top of the head and scar it. In worst cases they can ruin the head. But you will be able to hear it first usually. It will run rough and miss. About the only thing preventive you can do is check with CAT and see if the updated studs have been installed.
How to troubleshoot a Caterpillar engine variable valve?
2. Check the Engine Oil Pressure A. Turn the keyswitch OFF. B. Establish communication between the Caterpillar Electronic Technician (ET) and the engine ECM. The communication adapter must be communicating on both data links in order to perform this procedure. Refer to Troubleshooting, “Electronic Service Tools” for more information, if necessary.
Where is the NPT port on a PacBrake exhaust brake?
Every Pacbrake exhaust brake has a 1/8″ NPT port tapped into the side of the exhaust brake housing. It has a port plug threaded into it from the factory. Remove the plug and install a back pressure gauge to this port. Go for a test drive and observe the backpressure readings. My exhaust brake comes on at idle. Why is this?
What’s the fuel pressure on a C9 engine?
The o-ring kept the check valve stuck in an open position causing the fuel pressure to drop below 22 psi…enough fuel pressure for the engine to idle but not enough to run at high-idle under any load. The Cat spec for fuel pressure on this generation of C9 is 55 at idle-75 psi at full load.
Do you need a cast elbow for PacBrake exhaust brake?
Vehicles with a 90° header pipe use a cast elbow to interface with the stock header pipe. Pacbrake offers replacement header pipes for some truck models. What is a fixed orifice exhaust brake?