Filler Cap 'O' Ring

Buying the kit makes that an expensive O-ring. Take the cap to the nearest garage that has a kit, let them make one to fit.

Don't try gluing your existing ring - if it broke the material is probably past its best and it will fail again.

The kit is just a load of O Ring in lengths and some glue. I won't buy the kit, just an oversized O Ring which I'll cut and trim to the correct diameter and glue the ends together. Total cost <£10.
 
Just looked at a similar fitting and the screw is in the centre of filler cap so only 20sec job if you stretch O ring over cap

Sounds good. There was a reason why I had to undo the chain, but I can't remember what it was tbh (it was five years ago). Perhaps my o ring was insufficiently stretchy? :D
 
Petem, you seem to have suffered a bit of boaty banter on here today, but may I just suggest this: measure the required diameter and thickness carefully with a micrometer then go to this website: www.simplybearings.co.uk. They do more than bearings! including a huge array of o-rings, I'm sure you will find yours there and they are cheap as chips
 
My water filler cap 'O' ring has broken. Does anyone know of a supplier or the size so that I can source a replacement from eBay?

Filler cap looks like this..

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Ta.

I thought this must be a trick question because I wouldn't put water in that filler......the engine won't like it!
 
Any O ring requires two of three measurements and access to a sizing chart (google).

1 The rubber cross sectional diameter - if the ring has flattened then the average of the widest and narrowest measurements.

2 The OD of the fitting the ring sits around (O ring ID), or the ID of the fitting it sits within (O ring OD). Only one of these is required, but standard charts refer first and foremost to the O ring ID.

If there is no old ring the CSD can be worked out by measuring the O ring recess depth, or width, or both ID and OD. Most black O rings will be Nitrile sometimes referred to as Bhuna. Neoprene is less common but equally effective. Commonest are O rings marked by the makers NBR70 which is Nitrile rubber with a typical hardness rating of 70. The green O rings commonly used on VP engines are Viton, which is a compound of PTFE, which should never be used upon refrigeration systems.

For fresh water vaseline or silicon grease makes a good sealant aid, and can be used to form a temporary seal if thoroughly applied. For diesel waterproof grease.
 
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