Oil pump O rings

[Trigger]

Does anyone know the thickness of the O ring that is located behind the plate with the 4 bolts on the oil pump. It is about 27mm, but I can not work out the thickness of the old, flat, brittle one.

[mike the bike]

I just measured one that's gone oval; 1.45 x 2.32, so it's probably 2mm

[Trigger]

I just measured one that's gone oval; 1.45 x 2.32, so it's probably 2mm

Are you getting 27mm ID Mike ?

[mike the bike]

Looks about that.  Don't make me get off my arse for the caliper.

[Nurse Julie]

Get off your arse, I need accurate measurements 

[mike the bike]

Wait till I finish this game of crib

[Nurse Julie]

Crib.........are you joking?

[mike the bike]

No.  It's a game for grown ups so go back to your game of snap.

I measured the O ring best I can and it's 30mm

[Nurse Julie]

ID ?

[mike the bike]

That was the OD.  ID is obviously OD - 2t

[Nurse Julie]

Ok Mike, thanks for that, I owe you anoooooother pint. Trying to stop Hettie leaking like the Torre Canyon. She reminds me of most of my old Triumph's and BSA's at the moment 

[mike the bike]

What's up with the O ring, Gone all hard and cracked up has it?

[Nurse Julie]

Yep, they all had, so having a complete rebuild

[mike the bike]

Annoyingly,  the gasket set doesn't include that 30mm O ring, the big 60mm (ish) oil pump O ring or the oil filter O ring.

[Nurse Julie]

Yes, luckily I found all of the other 7 O rings I needed to overhaul the pump at home, it was just that one I couldn't quite work the size out.