How does the CMP actuator control the camshaft?

The CMP actuator assembly (15) varies the camshaft position in response to directional changes in oil pressure. The CMP actuator solenoid valve controls the oil pressure that is applied to advance or retard a camshaft. Modifying camshaft timing under changing engine demand provides better balance between the following performance concerns:

What kind of actuator is used for VVT?

GM’s VVT system uses electro-hydraulic actuators between the drive sprocket and camshaft to twist the cam relative to the crankshaft position. Adjusting the cam phasing in this manner allows the valves

What causes the cam to move back in the block?

If the end play is excessive, it will cause the cam to move back in the block, causing the side of the lobe to contact an adjacent lifter. Broken dowel pins or keys. The dowel pin or woodruff key does not drive the cam; the torque of the timing gear bolt, or bolts, against the front of the cam drives the cam.

What should I do if I have a camshaft failure?

For extra protection, an anti-wear additive should be added, such as Crane Super Lube. Do not use synthetic oil during the break-in period. It is not recommended to use any type of oil restrictors to the lifter galley, or use windage trays, baffles,or plug any oil return holes in the valley.

How do you replace a faulty camshaft adjuster?

Replacing it requires removing the solenoid and valve cover, releasing tension on the timing chain, and then removing the gear from the camshaft. Special tools and procedures are required to make sure everything is kept in the right position, the timing chain is kept from dropping, etc.

How is the timing of a camshaft determined?

Basically, what you have on the front of each camshaft is a gear that is driven by the timing chain. Without variable valve timing, that gear would simply be forged onto the end of the camshaft and timing would be dictated by that gear’s relative position to the crankshaft via teeth on the timing chain.