Theoben evolution o’rings

[mattyw1987]

Does anyone know the sizes and material for the ram o’rings in a theoben evolution?

[The Squire]

A guy called Martin posted this on the FB rammer group, I’ve not verified it but have no reason to believe it’s wrong:

I serviced my Evolution HE last month.
Kit I bought seemed to have 90 shore orings in and didn't seal.
Measured them and ordered some 70 shore ones and it sealed straight away.
Sizes you need are 18 X 2.5 four required and 13.95 X 2.62 two required.
The later is an imperial equivalent.
Loads on .
Small amount of engine oil to lube on assembly.
I'm 500 shots in and all good.
Pressure set at about 50 bar then chronograph and tweak.
Older guns run at lower pressures this pressure is only for HE guns

[mattyw1987]

A guy called Martin posted this on the FB rammer group, I’ve not verified it but have no reason to believe it’s wrong:

I serviced my Evolution HE last month.
Kit I bought seemed to have 90 shore orings in and didn't seal.
Measured them and ordered some 70 shore ones and it sealed straight away.
Sizes you need are 18 X 2.5 four required and 13.95 X 2.62 two required.
The later is an imperial equivalent.
Loads on .
Small amount of engine oil to lube on assembly.
I'm 500 shots in and all good.
Pressure set at about 50 bar then chronograph and tweak.
Older guns run at lower pressures this pressure is only for HE guns

Nice one bud thanks for that will grab some of them.

Cheers.

[The Squire]

Not sure you save that much if just buying one set, I believe Bagnall & Kirkwood still sell sets on under A1 tackle shop.

[look no hands]

Not sure you save that much if just buying one set, I believe Bagnall & Kirkwood still sell sets on under A1 tackle shop.

I got a set for a Fenman, not used them.

[Anothermiss]

Engine oil on orings? I'm sure that'll destroy the rubber. Silicone grease would be my choice