[Vwdiesel] Oh-Oh...First winter **** up!

Erik Lane erikjlane at yahoo.com
Tue Nov 9 11:46:06 EST 2004

--- LBaird119 at aol.com wrote:

>   Just like pressure testing a head or radiator. 
> Plug the hole/s. put 
> pressure to one of them, immerse in water and look
> for bubbles.  A 
> radiator shop should be able to test it for you. 
> Radiators are tested 
> at 15 to 20psi.  You might want this tested closer
> to 100psi.

But I think it's important to put the pressure to the
oil passages of the cooler and see if it comes out the
coolant side, because that would be the direction of
flow if it's leaking. If there's something corroded in
there just enough to leak one way and not the other
that might be the only way to find it. I think you'd
have to have a special adapter made up to put pressure
to the oil side of the cooler off of the vehicle.
That's why I tested it on the car. Didn't take long at
all to see it weeping out steadily.


> > 
> > The system is still half full of coolant, the
> expansion tank coated with
> > really thick, black, gunge...  The cap is packed
> solid... Any ideas on a way
> > to flush system and rad.? 
>   Only think I 've been able to come up with is
> maybe alcohol or a fairly 
> high concentration of industrial floor
> cleaner/degreaser.  Here, Costco 
> sells some stuff that'd probably do a great job of
> it.  Then flush out with 
> water.
> > 
> > I cut the top hose off and started it up, the temp
> guage hit max and warning
> > light started flashing within 30 sec. Couldn't
> feel any pressure from the
> > hose at idle but when I revved it I got covered in
> coolant... Is that a sure
> > sign the head is gone? Or is it 'cos of the water
> pump? No white smoke from
> > exhaust and it sounds pretty normal...
> > 
>   Temp light probably pegged from low coolant in the
> reservoir.  Often 
> seems to peg the gauge on my Dasher too.  Not sure
> if that's an 
> intermittent short or what but it's never been from
> being hot.  Just slowly 
> peg and flash then return to normal. 
>   You rarely see white, antifreeze smoke on the
> diesels.  Too high of 
> compression so the coolant doesn't get in the
> combustion chamber, just 
> combustion gasses into the coolant.
>   Once you get it all back together to warm it up,
> look for bubbles in the 
> small, return line (Vanagons have that like the
> rest, don't they?)  If you 
> don't get a steady stream then the line's either
> plugged or you've got 
> a blown gasket and are just getting air.
>   A leakdown test is where you pressurize the
> cylinder, usually with a 
> special gauge set.  The gauges will tell you how
> much air is leaking out, 
> you listen and look to see if it's past an intake
> valve, exhaust valve, rings 
> or into the coolant passages.
>      Loren
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