No subject

from the pressure.   Given the fact that this engine has around 200,000
miles on it since the last rebuild and there is probably a fair amount of
combustion gas getting by the rings, is there any additional value in
venting the sump directly to the atmosphere instead of blanking it off? 

Craig 


> -----Original Message-----
> From: mark shepherd [mailto:mark at shepher.fsnet.co.uk] 
> Sent: Thursday, July 02, 2009 6:27 PM
> To: Craig Osborn
> Subject: Re: [Vwdiesel] Crankcase ventilation / rotary vacuum pump
> 
> 
> Blank off the sump ventilation and ventilate from the cam 
> cover only. Only 
> the brake servo/booster should attach to the vacc line [maybe 
> some small 
> control lines too eg a/c...]
> 
> Mark
> ----- Original Message ----- 
> From: "Craig Osborn" <cosborn at epix.net>
> To: <vwdiesel at vwfans.com>
> Sent: Thursday, July 02, 2009 11:11 PM
> Subject: [Vwdiesel] Crankcase ventilation / rotary vacuum pump
> 
> 
> >
> > I recently purchased a rotary vacuum pump that was advertised as a 
> > bolt on replacement for my old diaphragm type vacuum pump 
> on my 1981 
> > PU. When I started to install the pump I noticed that it 
> only had one 
> > hose fitting whereas the old diaphragm pump had two hose 
> fittings (one 
> > on the top that went to the brake servo, and one on the 
> side that went 
> > to the crankcase).
> > I took the car around the block after hooking up the vacuum 
> hose to the 
> > top
> > fitting without attaching the crankcase hose to anything 
> and I had the 
> > best
> > braking power that I have had in years.
> > I then called "Parts Place" to ask what to do about the crankcase
> > ventilation hose and they said that many of their customers 
> were putting a
> > T-fitting on the top and attaching both hoses this way.  
> When I did this, 
> > my
> > braking power decreased markedly.
> > I then took my old diaphragm pump and spun the gear and 
> noticed that it
> > pulled a vacuum in the top hose fitting but put positive 
> pressure out of 
> > the
> > bottom fitting where the hose would attach that would go to 
> the crankcase.
> > Given this discovery, it seems as though the recommended T 
> fitting would 
> > not
> > be the proper thing to do.
> > Can anyone help me retrofit this pump properly on to my 
> 1981?  Maybe 
> > someone
> > with a 1984 (when they started factory installing the 
> rotary pumps) can
> > explain how their ventilation system is set up.
> >
> > Craig
> >
> > _______________________________________________
> > Vwdiesel mailing list
> > Vwdiesel at vwfans.com 
> http://www.audifans.com/mailman/listinfo/vwdiesel
> > 
> 
> 
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