[T3] The road trip blues

[William J]

 I  wonder if the issue with the blow by is more some issue with the 
crankcase venting instead of actual blow by. I bring this up because Daniel 
stated in his first post that he has had an issue with the breather plastic 
plug coming loose even when he needed to seat it with a mallot and long ago 
when they went on a trip in the winter they heard something and found the 
cap was missing  if I recall they looked and saw the spring  still in place 
then drove back and found the cap , it's been a while so I can't recall if 
it was the cap they found.

 My point is I'm not certain on a 69 how the actual venting is done , I 
think VW did away with the old road draft tube before 69 and vented from the 
breather to the oil bath yet it was a single hose further down on the air 
intake neck of the oil bath . I'm sure they have replaced the hose and am 
not certain how the oil bath is setup internally since I've never seen one. 
He did mention the cap came loose about every 6 months . I'm just wondering 
if there is some sort of restriction either in the breather or the venting 
from there to the oil bath the plastic cap to me seems to be the first thing 
that would let go. It was also at 70 MPH when the crankcase pressure it at a 
high point . Depends how one defines blow by and crank case pressure . Blow 
by would be past the rings and if the oil rings were an issue they would be 
burning oil which Daniel said wasn't an issue and the other rings if worn 
would cause other issues which don't match up to what Daniel has said . 
Crankcase pressure is just the up/down movement of the rod end of the 
pistons creating pressure in the crank case which can be added to if there 
was blow by which is always there yet to a very small extent even on a new 
engine with well seated rings because of the combinded ring gaps which is 
why we always stagger the gaps.
----- Original Message ----- 
From: "Jim Adney" <jadney at vwtype3.org>
To: <type3 at vwtype3.org>
Sent: Wednesday, August 23, 2017 6:57 AM
Subject: Re: [T3] The road trip blues


On 23 Aug 2017 at 8:51, Daniel Nohejl wrote:

> The loss of power was momentary and weTMve been running pretty much fine
> since the incident. I thought excess blowby was something an engine either
> had or didnTMt have¦.that itTMs not transient. I guess  compression
> and leak down tests might be in order.

Once you have the engine exposed, also check the oil level in the air 
filter. If
there's been a lot of blowby, it could have overfilled the AF, which might 
then
overflow into the IAD. If that filled up, oil could get sucked into the 
engine,
causing a momentary loss of power.

If the IAD seems like it might be filled with oil, remove that end of the
pressure sensor hose and let it drain out there.

The good news is that oil on your engine will keep things from rusting.  ;-)

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

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