How do you test a push rod?
How do you test a push rod?
This can be done via visual inspection at the rocker-arm tip, but the easiest way is to spin the pushrod-checking tool with your finger tips while tightening the rocker-arm nut. When you feel resistance on the checking tool, you have reached zero lash, and tightening of the nut should stop.
Why would a push rod break?
If the intake valves push rod is bent, the valve will come into contact with the piston. If a valve has been opened up because of a loose lock nut or if it has been adjusted with an incorrect clearance. It can make the valve bend.
How does a push rod work?
Pushrods are long, slender metal rods that are used in overhead valve engines to transfer motion from the camshaft (located in the engine block) to the valves (located in the cylinder head). The camshaft lobe moves the lifter upwards, which moves the pushrod.
What happens when pushrod length is too short?
“Now, if the pushrod length is too short, you can have alot of lash where the pushrod isn’t in contact with the lifter and the rocker arm at the same time,” says Holdener. Besides being bad for power, since your camshaft isn’t effectively controlling your valve, that excess movement can also beat up the other components in the valvetrain.
What kind of pushrod is used for dyno test?
The valvetrain for the test is comprised of a Crane camshaft with .624-inch lift, a duration split of 232/242 degrees at .050-inch with a 112-degree lobe separation angle. A COMP Cams standard-travel hydraulic-roller lifter was used along with hardened pushrods in all the tests.
What is the pushrod length of a 5.3 liter LS?
The OEM pushrod length of a 5.3-liter LS is 7.400 inches, so that will be the base length of Holdener’s testing. The valvetrain for the test is comprised of a Crane camshaft with.624-inch lift, a duration split of 232/242 degrees at.050-inch with a 112-degree lobe separation angle.
What’s the difference between 7.400 and 7.500 inch pushrods?
That explains why the results between 7.400-inch and 7.500-inch pushrods appear to have the same effect on the power production as tightening up the lash on a solid roller or adding extra rocker ratio.
