You can buy the timing belt cover plate with the fitting already on it, like these:

http://www.ebay.co.uk/sch/i.html?_f...t&_nkw=discovery+300tdi+breather+kit&_sacat=0

I cut a new plate and welded a 1/4 BSP (I think) fitting to it, sealed it with tiger seal, jobs a goodun.

Dave, I don't really know why but with the wading plugs fitted if you go into deep water it will get into the timing chest maybe air expanding and contracting? If I remember right the crankshaft seal on the cover is only felt so its not going to need much suction to get past that. I am certain that since fitting the breather there's no water in there anymore when I take the wading plugs out.
Kev
 
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You can buy the timing belt cover plate with the fitting already on it, like these:

discovery 300tdi breather kit | eBay

I cut a new plate and welded a 1/4 BSP (I think) fitting to it, sealed it with tiger seal, jobs a goodun.

Dave, I don't really know why but with the wading plugs fitted if you go into deep water it will get into the timing chest maybe air expanding and contracting? If I remember right the crankshaft seal on the cover is only felt so its not going to need much suction to get past that. I am certain that since fitting the breather there's no water in there anymore when I take the wading plugs out.
Kev

Well thanks for that Kev. The way I'm looking at this is: even if any water was able to past the cambelt cover seals (and I doubt it myself) where is the problem? All you do is remove the wading plug and if there's any kind of fluid in there, it's just drain out?? Unlike gearboxes and diffs where if water gets in and mucks up the oil, there's no quick and free way of getting it out. So I can see breather performing a useful, if not to say essential task for them.

Dave

Anyway, thanks again for your reply.
 

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