GMC 5234530 Lifter Assembly, Valve

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Keep lifters and pushrods in order! This is absolutely necessary for installation, since these parts have differences which could result in engine damage if not installed in their original positions! Remove intake manifold, valve covers, rocker arm assemblies and pushrods. Remove the valve lifter guide retainer bolts, the retainer guides and valve lifters. Disassemble by removing the retainer ring with a small screwdriver, pushrod seat and oil metering valve, plunger and plunger spring, and check valve retainer from plunger, then remove valve and spring. After lifters are disassembled, all parts should be cleaned in clean solvent. A small particle of foreign material under the check valve will cause malfunctioning of the lifter. Close inspection should be made for nicks, burrs or scoring of parts. If either the roller body or plunger is defective, replace with a new lifter assembly. Whenever lifters are removed, check as follows: Roller should rotate freely, but without excessive play. Check for missing or broken needle bearings. Roller should be free of pits or roughness. If present, check camshaft for similar condition. If pits or roughness are evident replace lifter and camshaft. Assemble by coating all lifter parts with a coating of clean kerosene or diesel fuel. Assemble the ball check, spring and retainer into the plunger. Install plunger spring over check retainer. Hold plunger with spring up and insert into lifter body. Hold plunger vertically to prevent cocking spring. Submerge the lifter in clean kerosene or diesel fuel. Install oil metering valve and pushrod seat into lifter and install retaining ring. Prime new lifters by working lifter plunger while submerged in clean kerosene or diesel fuel. Lifter could be damaged when starting engine if dry. When a rocker arm is loosened or removed, valve lifter bleed down is required. Lifters must be bled down as possible valve to piston interference due to the close tolerances could exist. Before installing a new or used lifter in the engine, lubricate the roller and bearings of the lifter with No. 1052365 lubricant or equivalent. Install lifters and pushrods into original position in cylinder block. Install manifold gaskets and manifold. Position rocker arms, pivots and bolts on cylinder head. Install valve covers. Install intake manifold assembly.

Lifter priming is crucial because lifter damage can occur when starting the engine if the lifters are dry. Priming ensures proper lubrication of the lifter components before engine operation.

If the cam lobe lift is less than the specified value, it is recommended to install a new camshaft.

After installing the camshaft, install the timing chain and sprockets. Lubricate the lifters with clean engine oil and install them in the block. Finally, change the oil and install a new oil filter before starting and running the engine.