Just had a look over the How To on the Breather System. I noties about the Vent Housing part D. I forgot to do this, cannot see it looking into engine bay . Is it easy to get at and what would be the best way to do it.?

Thanks .

Note that the lower picture was taken while the engine was out of the car (not my car...), so don't expect to get that much clearance with the engine in situ.

Thank,s Gents will get that job done asap.

I did mine with the plenum off so didn't need to take-off the scuttle.

But from memory, with both the scuttle and the plenum in place, this would be a very difficult job....

Could anyone tell me just out of intrest  How the Breather vent works? and what does it does. Had a look today and can see it looks like a nice job for the weekend if the weather is ok.

Thanks
Steve.

The breather system on an engine carries out two main functions

1) Removal of any blow by gases from the crank case

2) Removal of oil vapour fom the crank case.

This is done to stop pressure building up in the engine which can cause seal failure and/or increased hydrocarbons in the exhaust due to raised oil consumption.

This task is carried out by the breather system and consists of two pipes, one large and one small.

The breathers aim to keep the engine crank case at less than atmospheric pressure i.e. a slight vaccum.

The first breather is the smallest of the two, this is only realy used whilst the engine is at idle or very small throttle openings. This pipe connects to the engine side of the throttle butterfly because under these conditions there is little vaccum on the air filter side. Because the vac at this point in the inlet system is very high and the gas required to run the engine is very small (particularly on tickover), a small pipe is used and often a small controlled drilling (as seen on the V6 breather box or inlet manifold/throttle on the 4 pots) so as to control the amount of gas drawn through and hence idle is not affected (drill the holes out and idle will be affected!).

The larger breather is used on wider throttle openings, at this point the vac in the inlet system is lower the difference in vac on either side of the throttle body is pretty equal and a larger pipe is  needed to shift the increased amount of blow by gases. Using a large pipe also results in very little gas passing through the smaller breather pipe under these conditions which, is also a good thing as its less likely to block! This larger pipe is connected to the air filter side of the throttle.

Hope that explains it a bit.

Thank you that is great. I always like to know how and why something does what is does. That a great help guys

The top pic was me, the lwoer pic might be Mr Mcburger.

Would it be useful if I added the description to the maintenance guide.