BMC 2.2 Oil pressure relief valve nut size ??

[Paul1977]

Hi, just a quick 1. Does anybody know the size of the nut on the oil pressure plug ?? I want to pop mine out to give it a clean and I havnt got the right size socket to do it but would happliy buy one if I knew what size.

 

Cheers

 

Paul

[bottle]

Do not know for sure, so do not buy on my say so, but suspect it may be an AF possibly ½".

[Paul1977]

Ok, I think I might have a 1/2" spanner in the shed to try. Also what I noticed, was that the plug (bolt) head was rounded with the socket hape raised in the center. This then only seems to give about 2 to 3mm to fit a socket. Is this right or should the plug head be a proper bolt shape ??

[bottle]

I guess you may find a copper washer/seal (compressible) under there.

 

I would wait until someone that does know what is there and the size before investigating any further.

 

Edit: just had a google and yes there is 'special' washer link so I would not do anything until I had one.

Edited September 17, 2013 by bottle

[Dalton]

Is this plug positioned on the low left side of the engine, when standing behind it looking forward? I need to replace mine, as it is severely corroded and leaks oil. Where can I get a new one?

[bottle]

See my link in post above yours and search for "bmc oil pressure relief valve nut"

[Dalton]

No picture there. And there are no mentions of the 2.2litre engine.

[Tony Brooks]

This may be completely wrong but from nearly 50 years ago:

 

I remember we had to undo something on a 2.2 that was a plug with a (5/8AF) female hole in it. This may have been the oil pressure relief valve. We brazed/welded an old injector pipe nut to a length of bar for a key.

 

The other thing is since this thread was posted I keep getting a vision of a large slightly domed "bolt head" about 1" AF but that may be from cars. I would expect it to be on the same side of the engine as the oil filter.

[Dalton]

The plug I am talking about has a square, female hole in it. A copper washer seals the seating.

[Paul1977]

This may be completely wrong but from nearly 50 years ago:

 

I remember we had to undo something on a 2.2 that was a plug with a (5/8AF) female hole in it. This may have been the oil pressure relief valve. We brazed/welded an old injector pipe nut to a length of bar for a key.

 

The other thing is since this thread was posted I keep getting a vision of a large slightly domed "bolt head" about 1" AF but that may be from cars. I would expect it to be on the same side of the engine as the oil filter.

Yes tony, it is a slightly domed "bolt head", im not sure what Daltons lookings at. The oil relief valve on a 2.2 is directly under the oil filter bracket. I've ordered a 1" AF socket of the web so hopefully that will fit.

[Dalton]

The plug I am talking about is on the opposite side from the oilfilter. Right behind the fuelpump, belowe the sidecover.