[Vwdiesel] Blow-by test?

[mark shepherd]

With my 4mm ring gap, I saw percolation....  [Pics sooon, 'new' engine 
working well ;o)  ]

To see it properly,  you must squeeze vent pipe from valve cover, else the 
vacuum from intake sucks the loosely resting cap back down, unless vent 
blocked of course...

There will always be some flapping due to the pumping action of the 
underside of the four pistons.

Use leakdown to distinguish leaks from rings coming up oil drains, and leaks 
into intake and leaks into exhaust. for signs of poorly fitting/burnt 
valves...

Mark


----- Original Message ----- 
From: "Joe" <joe at haasenpfeffer.com>
To: <vwdiesel at vwfans.com>
Sent: Tuesday, August 17, 2010 10:37 PM
Subject: [Vwdiesel] Blow-by test?


>
> I recently saw a vid on You Tube for a different brand of diesel, and they
> were checking the engine for a "blow-by" test.  They pulled off the oil 
> fill
> cap and would lay a small piece of cardboard over it.  If it doesn't
> "percolate" then it's OK?  What does this mean?  And what is an acceptable
> amount of "percolation"?  Because my 82 Rabbit does it quite well.
>
> Oh, I guess "percolate" isn't the right word... Was thinking like an old
> coffee pot.  Hopefully you know what I mean?
>
> Joe
>
>
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