Why are my rocker arms hitting my valve cover?
Weak spring tension will not seat the valve (s) tightly. There are two issues involved here: pushrod length and valve stem height. This should clarify why your rocker arms are hitting the valve cover on the pushrod and valve stem side. Thank you so much for your absolutely fantastic explanation.
How does zero clearance work on a jeep lifter?
The lifter’s oil level maintains the zero-clearance between the pushrod and rocker arm. “Zero” just removes the valve stem-to-rocker arm gap without unseating the valve . This consistent zero clearance is maintained by the lifter’s plunger height, which is controlled by the check valve and oil volume in the lifter’s cavity.
What is the check valve on a jeep lifter?
When the pushrods fill with oil (do not fill the lifters with oil, let them fill with the engine running), the oil and lifter check valves will hold the lifter plungers at this height in the lifter with the engine running. The check valve keeps the lifter from bleeding down on the loaded upstroke of the lifter.
How is the lifter preload determined on a jeep?
Lifter preload is determined by the pushrod length on AMC inline sixes (232/258/4.0L) and 2.5L AMC four cylinder engines. The installed valve rockers are at a fixed position that cannot be altered.
Weak spring tension will not seat the valve (s) tightly. There are two issues involved here: pushrod length and valve stem height. This should clarify why your rocker arms are hitting the valve cover on the pushrod and valve stem side. Thank you so much for your absolutely fantastic explanation.
The lifter’s oil level maintains the zero-clearance between the pushrod and rocker arm. “Zero” just removes the valve stem-to-rocker arm gap without unseating the valve . This consistent zero clearance is maintained by the lifter’s plunger height, which is controlled by the check valve and oil volume in the lifter’s cavity.
When the pushrods fill with oil (do not fill the lifters with oil, let them fill with the engine running), the oil and lifter check valves will hold the lifter plungers at this height in the lifter with the engine running. The check valve keeps the lifter from bleeding down on the loaded upstroke of the lifter.
When do you need to adjust valve clearance on a jeep?
When these engines develop valvetrain noise, owners often think a valve adjustment will cure the problem. In each of these AMC/Jeep engines, valve clearances are set during assembly of the engine, and adjustment is not necessary between engine rebuilds.