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International Automotive Technicians Network
Re: GM LS Oil pump Alignment Tool
Posted to Technical Discussion Forum on 3/9/2021

If the truck has lifter noise, the likely cause is the oring between the oil pickup tube and the oil pump. Very common issue on 5.3 engines. The oring can be replaced by just dropping the oil pan The oring shrinks and the oil pump sucks air Login to read more.