Why is the rocker arm important to the engine?
The valve stem keeps the right air and fuel mixture within the engine, allowing for proper timing of ignition and combustion. When the camshaft lobe raises the arm, the inside of the arm presses on the valve stem to open the valve at the correct time to allow pressure and gas either inside or outside of the system.
Where is the pivot point on the rocker arm?
Some engines use shorter rocker arms for their internal process, where the cam lobe pushes down on the rocker arm to open the valve. On this type of arm, the pivot point is at the end of the rocker arm, making this kind of arm common on dual cam motors.
Where is tappet clearance on a valve stem?
>Tappet clearance is a space between the top of the valve stem and the rocker arm. >Its purpose is to allow for some mechanical expansion and lengthening of the valve stem and push rods as the engine warms up. This clearance is also called valve lash. Why Tappet Clearance Is Given?
Which is the correct way to close a compression valve?
Push rod should be free. (both the valve should be close at this stage ie at the end of compression stroke) 3. Make sure the engine has cooled down. 4. Loosen the lock nut of the rocker arm. 5. Now adjust the tappet clearance between the rocker arm & valve stem by tightening or loosing the nut below the lock nut. 6.
>Tappet clearance is a space between the top of the valve stem and the rocker arm. >Its purpose is to allow for some mechanical expansion and lengthening of the valve stem and push rods as the engine warms up. This clearance is also called valve lash. Why Tappet Clearance Is Given?
Push rod should be free. (both the valve should be close at this stage ie at the end of compression stroke) 3. Make sure the engine has cooled down. 4. Loosen the lock nut of the rocker arm. 5. Now adjust the tappet clearance between the rocker arm & valve stem by tightening or loosing the nut below the lock nut. 6.
How tall do valve locks need to be?
If the measured installed height is short of the required spec, one option is to use 0.050-inch taller valve locks that move the retainer higher on the valve (left). A critical item to check is to ensure proper clearance between the rocker arm, valve tip and the retainer when using these taller locks.
What is the distance between the spring retainer and the head?
This is the distance between the spring seat in the head and the bottom of the valve spring retainer. This dimension not only establishes the amount of load holding each valve closed but also affects the maximum valve lift spring load as well as affecting several other critical clearances.