Re: [T3] Oil forced out of breather

[Jim Adney <jadney@vwtype3.org>]

On 3 May 2004 at 23:53, Dave Hall wrote:

> VW Workshop bulletin M-5 August 1969 for Types 1, 2, 3, and industrial engines
> 122, 124A and 126A states:-
> "If oil is lost via the crankcase breather, first check whether the cylinder
> head cover gasket is properly located, as tests have shown the following:
> 
> Increased pressure in the crankcase causes oil to be forced out of the crankcase
> breather on some engines.  The cause of the increase in pressure can be due to
> gaskets that slipped.

I wonder if this could be because of the way the opposed pistons always move in 
opposite directions and that the main bearing webs divide the case into 3 
chambers. There is space above the webs, but maybe that's not enough to keep 
things on an even keel. This might mean that the pressures/vacuums built up in 
there might not even out and there might be some net pumping.

But if that's the case, why don't the 72-3 engine have this problem, even 
though they have vents in the rocker boxes?

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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