Bolt size for vibration dampener on 4.2 litre six cylinder

What socket size fits the bolt for the vibration dampener on the 4.2 liter six cylinder engine? I’ve tried 33 mm (too big), 32 mm (too small) and 1.1/4" (too small).

I bought a 1 5/16" socket years ago just for this purpose - surprising your 33mm is too big!

IIRC it’s a whitworth size but just about everybody gets by with a 1-5/16" socket. They are very close to the same.

Yes, John, that’s what is mentioned in the link I provided as enunciated by @davidxk:

“I believe the correct answer is 3/4’’ Whitworth, but due to availability most people us a 1-5/16’’ SAE socket. They are so close that it works fine.”

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Thanks very much for the prompt replies, gentlemen. It’s most appreciated.

Just to complete the esoterica, the bolt head is Whitworth but the threads are not. They are UNF.

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