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NE gasket set, do I need thicker o-rings?

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Trigger:
It all depends on the thickness of the gasket so, measure it up and work the size out  ;)

Seabeowner:

--- Quote from: Seabeowner on October 20, 2022, 07:20:22 PM ---Hondaman suggested an imperial size I think that I converted and noted down as 5.6 x 2.38mm. The actual oil feed channel I measured as 4.83mm.

--- End quote ---
Going back to this that O ring appears to be 7/32 x 3/32. And not terribly different from the 5 x 2.4 mm that is on the p/l. Just measured a few bits. The location in the top of the block (two old blocks) 1.11mm and 0.99mm (perhaps that ones been skimmed). Three old removed head gaskets (probably all aftermarket) 1.23mm, 1.24mm, 1.29mm. Two new head gaskets, 1.24mm, 1.09mm.
How much do the gaskets compress, how much do the relax when remove, who knows?
So quite a range. Taking the max location depth and the max head gasket thickness would be 2.4mm!  Best case would be 2.08mm
There are many intermediate sizes available, so and 2.4mm looks not enough, but it is often the source of leaks if you don't get it right.

SteveW:
Measured my original head gasket today and bang on 1.2 mm. new head gasket measures 1.29 mm so I’m thinking of using a 5 x 2.5 o-ring instead of the 5 x 2.4.

Oddjob:
Was the original unused or used?

SteveW:
Used.
Bugger, just realised. More confused than ever now.

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