What is this tool used for?

[SteveD]

When doing the tappets, if that tool was used in that way, it allows the wrench to sit at the heads and move the wheel to move the valves. Nifty.

[Rob]

When doing the tappets, if that tool was used in that way, it allows the wrench to sit at the heads and move the wheel to move the valves. Nifty.

I never cared for that much.
I always put an allen socket in my 3/8" drive ratchet and worked it from the alternator.
(Remember the recent photo someone posted where the owner drilled a large hole in the front cover in front of the alternator screw, plugged with a timing plug? I would be doing that right now if I owned one!)

In Metric countries, what size ratchet drives do they use? I've never heard of anything except SAE sizes.

[Airbear]

In Metric countries, what size ratchet drives do they use? I've never heard of anything except SAE sizes.

O Rob, it's so embarrassing!

Here we are, feeling smug about being an enlightened and civilised country with socialised medicine and Celsius degrees and no death penalty and kilometres and stuff, yet we still use medieval nomenclature for our socket drives. Perhaps if I start to refer to my "harfinch" ratchet drive as a "twelvepointsevenmil" I'll feel better.

[Toofar]

Could be worse. Could be Whitworth.