[Vwdiesel] Smoky, Bubbly Engine?

[mark shepherd]

Hi Will,
I'd just start it up a few times over a period of a week , and then see if 
compression on #4 improves.
IMO blowby is a function inversely related to speed, because it takes time 
to allow gases to escape. Additionally, vent from cam cover develops a 
slight vaccuum due to preference of its feeding engine to that through paper 
air filter. Are bubbles immediate? If slight then perhaps after a warm up 
undo and nip back up each head bolt to about 90 lbft
Nothing to loose and everything to gain...
Mark

----- Original Message ----- 
From: "Will Taygan" <william at taygan.com>
To: "vwdiesel" <vwdiesel at audifans.com>
Sent: Monday, November 02, 2009 1:13 AM
Subject: [Vwdiesel] Smoky, Bubbly Engine?


>
> I picked up a 1990 Jetta 1.6NA diesel for $400 last spring, and finally
> got around to checking it out today (too much time spent reviving the
> 1982 1.6NA Westfalia.)
>
> The engine has a junkyard marks, and a vanagon intake manifold.
>
> Really smoky exhaust, smells like oil.  Obvious bubbles coming out of
> the coolant expansion tank.
>
> Engine sounds like it wants to run away.
>
> Plenty of blowby from the valve cover, blows less when it revs (why is
> this??)
>
> Blowby is pushing up the dipstick and inch or so when engine revs.
>
> Pulled the injectors, #1 and #2 were sopping wet with black crankcase
> oil (not diesel).  #3 and #4 look good.  All glow plugs work, it drives
> and starts well (in the teens today).
>
> Compression was 405, 350, 390, 285, starting with #1 (the oily one by
> the timing belt).
>
> I don't really want to pull the head now, since it's gotten cold and I
> don't have a garage.  I'm just trying to get a "best guess" as to what's
> going on.
>
> Could is be "just" a head gasket?  That I could deal with.  Or, more
> likely a full rebuild (probably salvage the head and tranny, but bail on
> the block.
>
> Thanks for your ideas.
>
> Will in Alaska.
>
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