[T3] First Steps Engine Reassembly

[Jim Adney]

On 7 Jul 2018 at 11:43, William J wrote:

>  My PCV works yet is questionable and if it fails and or breaks since
> it's plastic then what. I have never seen the inside of the early oil
> bath so I don't know if it has the outer wall like the 73 that isolates
> suction and only provides filters air ,and do realize many may frown on
> changing my vent system . It's maily an emmisions device on a 72/73 to
> have a closed vent system and also the vacuum from the IAD FI system
> draws in oil fumes whcih tend to build up inside the IAD . The early
> system still draws oil fumes into the IAD yet perhaps at a smaller rate,
> I'm not sure. 

The '72-3 crankcase ventilation system works very well; there's no reason to 
consider changing it. The PCV valve is quite durable and should last forever. 
I've never seen a broken one. The only weak link in that system is the red 
vent hose between the heads and the air cleaner.

I'd love to find red replacement hose for those. Anyone got a source, Soren?

All the vent systems from the '68-on were closed systems for the sake of 
reducing pollution. The late system does a better job of scavenging water 
vapor out of the crankcase. That's it's advantage over the earlier systems.
The fresh air that the late system introduces into the crankcase dilutes the 
vapors there and makes them less likely to condense out before they reach 
the combustion chamber.

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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