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.
What kind of valve clearance does a jeep 2.5L have?
The subject of valve clearance on AMC/Jeep 2.5L fours and 232/258 and 4.0L inline six-cylinder engines is topical at the magazine’s forums —and across the internet! In this vlog, Moses Ludel talks in depth about checking and setting valve clearance on 1964-2006 AMC and Jeep inline sixes.
How tall is the valve stem on a jeep?
For non-adjustable rocker arm engines, Jeep does not provide a preload specification or pushrod length measurement anywhere in its service literature. When valves and seats are ground, the valve stem height is crucial. (Milling or surfacing the head will also alter the valve stem height.
Do you need adjustable rockers on a 4.0 Jeep?
4.0 jeep engines do not have adjustable rockers. (Unless you purchased adjustable roller rockers) You will need a push rod length checking tool. if you’re using a .043 crush gasket and stock lifters you may get away with the 4.2 push rods at 9.625 length. (IIRC) However you need to verify the actual length you need.
The subject of valve clearance on AMC/Jeep 2.5L fours and 232/258 and 4.0L inline six-cylinder engines is topical at the magazine’s forums —and across the internet! In this vlog, Moses Ludel talks in depth about checking and setting valve clearance on 1964-2006 AMC and Jeep inline sixes.
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.
4.0 jeep engines do not have adjustable rockers. (Unless you purchased adjustable roller rockers) You will need a push rod length checking tool. if you’re using a .043 crush gasket and stock lifters you may get away with the 4.2 push rods at 9.625 length. (IIRC) However you need to verify the actual length you need.
For non-adjustable rocker arm engines, Jeep does not provide a preload specification or pushrod length measurement anywhere in its service literature. When valves and seats are ground, the valve stem height is crucial. (Milling or surfacing the head will also alter the valve stem height.
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.
Why do I need to preload my lifter on my Jeep?
Preload is the depression of lifter’s plunger from its fully extended position downward into the lifter. Jeep inline four- and six-cylinder engines with hydraulic lifters need this preload to 1) prevent the plunger from pressing against the retainer clip and popping the lifter plunger loose and 2) to allow for minor valve face and seat wear.
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.
Preload is the depression of lifter’s plunger from its fully extended position downward into the lifter. Jeep inline four- and six-cylinder engines with hydraulic lifters need this preload to 1) prevent the plunger from pressing against the retainer clip and popping the lifter plunger loose and 2) to allow for minor valve face and seat wear.