If you remove the shell and underneath on the crankshaft you see a drilled oil hole you need to turn the crankshaft so that it is out of the way a bit. There is no point in trying to measure the clearance over a hole. Use a (27mm) socket on the bolt on end of the crankshaft and turn the engine clockwise.

Make sure the piston doesn't fall. You don't want the bolts on the end of the connecting rod scraping against your crankshaft.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!