GMC 5234200 Lifter,Valve

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To identify which of the valves of an engine is accompanied with a noisy valve lash adjuster, place a hose or tubing at each intake and exhaust valve during a running of the engine then listen to the noise at one end of the hose or tubing. Otherwise, if you take off the rocker arm cover and with the engine running, touch each of the valve spring retainers; you will feel the faulty lash adjuster through the retainer as the valve seats. As Schaevitz's warning suggests however, if adjustments are correct, dirt trapped between the plunger and lash adjuster body is often the root cause. Start with the L4 rocker arm cover followed by the intake manifold; L4 engines should have the pushrod cover also removed. Turn the nut of the rocker arm counterclockwise to get the rocker arm out of the pushrod area and then remove the pushrod. In removing the lash adjusters, one can use a special lash adjuster removal tool, or even just a sharp scribe so as not to mar the lash adjuster body in any way. Retain the lash adjusters for the purpose of reassembly in their respective sites. To dismantle a valve lash adjuster, apply pressure to the top of the plunger by inserting a pushrod to remove the pushrod seat retainer, pushrod seat, and metering valve by using a small screwdriver. The following components should be taken out, namely the plunger, ball check valve, plunger spring; the ball check valve will require use of a small screwdriver to remove in addition to the spring. Check all parts for signs of wear and where possible have the complete lash adjuster assembly replaced if any defects are noticed on the ball, particularly if there are flat spots on it. Each lash adjuster should have its camshaft lobe mating surface checked for scoring, wear, or erosion, any such texture on the lash adjuster body requiring its replacement while wear in the lash adjuster bore is rare. For reassembly, place the check ball on the small hole in the bottom of the plunger, insert the check ball spring on the seat in the ball retainer and fix the retainer. After that, insert the plunger spring over the ball retainer, turn the lash adjuster body upside down and make certain the oil holes are in proper orientation to each other before flooding the compartment with SAE 10 oil. Last but not least, fit the metering valve and the pushrod seat; push the seat in place and fix it by fitting the pushrod seat retainer. They must be replaced on their original bores and their surfaces should be treated with Molykote or an equivalent lubricating alloy before reinstalling them by reversing the above process.

To identify which of the valves of an engine is accompanied with a noisy valve lash adjuster, place a hose or tubing at each intake and exhaust valve during a running of the engine then listen to the noise at one end of the hose or tubing. Otherwise, if you take off the rocker arm cover and with the engine running, touch each of the valve spring retainers; you will feel the faulty lash adjuster through the retainer as the valve seats. As Schaevitz's warning suggests however, if adjustments are correct, dirt trapped between the plunger and lash adjuster body is often the root cause. Start with the L4 rocker arm cover followed by the intake manifold; L4 engines should have the pushrod cover also removed. Turn the nut of the rocker arm counterclockwise to get the rocker arm out of the pushrod area and then remove the pushrod. In removing the lash adjusters, one can use a special lash adjuster removal tool, or even just a sharp scribe so as not to mar the lash adjuster body in any way. Retain the lash adjusters for the purpose of reassembly in their respective sites. To dismantle a valve lash adjuster, apply pressure to the top of the plunger by inserting a pushrod to remove the pushrod seat retainer, pushrod seat, and metering valve by using a small screwdriver. The following components should be taken out, namely the plunger, ball check valve, plunger spring; the ball check valve will require use of a small screwdriver to remove in addition to the spring. Check all parts for signs of wear and where possible have the complete lash adjuster assembly replaced if any defects are noticed on the ball, particularly if there are flat spots on it. Each lash adjuster should have its camshaft lobe mating surface checked for scoring, wear, or erosion, any such texture on the lash adjuster body requiring its replacement while wear in the lash adjuster bore is rare. For reassembly, place the check ball on the small hole in the bottom of the plunger, insert the check ball spring on the seat in the ball retainer and fix the retainer. After that, insert the plunger spring over the ball retainer, turn the lash adjuster body upside down and make certain the oil holes are in proper orientation to each other before flooding the compartment with SAE 10 oil. Last but not least, fit the metering valve and the pushrod seat; push the seat in place and fix it by fitting the pushrod seat retainer. They must be replaced on their original bores and their surfaces should be treated with Molykote or an equivalent lubricating alloy before reinstalling them by reversing the above process.

Lifters should be assembled as follows: Coat all lifter parts with a coating of clean kerosene or diesel fuel. Assemble the ball check, spring, and retainer into the plunger. Install the plunger spring over the check retainer. Hold the plunger with the spring up and insert it into the lifter body, ensuring that the plunger is held vertically to prevent spring cocking. Submerge the lifter in clean kerosene or diesel fuel. Install the oil metering valve and pushrod seat into the lifter and install the retaining ring. Prime new lifters by working the lifter plunger while submerged in clean kerosene or diesel fuel to prevent engine damage during startup.

Inspect all components for wear, particularly the ball for flat spots. If any faults are found, replace the complete lifter assembly. Additionally, check each lifter for scoring, wear, or erosion on the camshaft lobe mating surface, as any imperfections on the lifter body warrant replacement, though wear in the lifter bore is uncommon.

If the lifters are in good condition, they can be reinstalled in their original locations, ensuring they are coated with moly-based grease or engine assembly lube.

To remove the lifters, first take off the intake manifold and valve cover, then lift each push rod out of the cylinder block. A special tool can be used to pull the lifters out, or a sharp scribe can be employed to force them upwards, avoiding the use of pliers on the lifter body.

The most likely cause of a noisy valve lifter is excessive wear at the lifter foot and camshaft lobe, or wear or contamination of the internal components.

For later models with roller lifters, remove the pushrod cover studs, lifter guide retainer, and lifter guide.

Rotate the crankshaft slowly until the lifter is on the heel of the cam lobe, bringing the pushrod to its lowest position. Zero the dial indicator and continue rotating the crankshaft until the pushrod reaches its highest position, noting the reading and comparing it to the lobe lift specifications.