The piston pins rotate freely in the upper head of the connecting rod and the piston bosses. The pin is held in the piston bosses from longitudinal movement by two retaining rings inserted into the annular grooves of the bosses.
Remove the piston rings.
Remove the pin retaining rings from the ring grooves of the bosses using a scriber.
Clamp the connecting rod vertically in a vice with soft pads and press out the piston pin using a mandrel of the appropriate size.
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Disassembling the connecting rod and piston group (BMW 3 Series E21)
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