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Originally Posted by northerner
Engine rebuilders have a tool which squeezes them to force out the old oil. They then need cleaning and filled up with new oil prior to fitting them. The tool is like a pressure piston with a handle. They are probably full of oil ATM!
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not technically right. I've used the equipment to do it. oil is pumped into the lifter to pop the piston out then the internals are cleaned and the lifter re-assembled.
I've stripped them when they've been compressed before, most of the time it breaks or bends the internal spring, it's the wrong way to do it.