[Vwdiesel] carbon/soot build up

jon jon at kenneke.com
Tue Aug 8 11:54:09 EDT 2006

You don't happen to be running vegetable oil in this car? I have seen huge
soot buildup with waste (or even) fresh vegetable oil conversions.
Biodiesel, on the other hand, seems to keep things clean.*

*But, you will, like me, need to replace a seal on your injection pump.
The old seals don't handle Biodiesel for long.


On Tue, 8 Aug 2006 engle31 at comcast.net wrote:

> No gooey soot, just hard, dried soot. It was an even amount across all cylinders and valve areas. I haven't checked the backside of the valves, that's next on the list. I was just wondering if the soot build up condition was an indicator of bigger issues.
> It had a 3 notch headgasket installed. I guess I could measure to ensure the proper headgasket was used last time it was replaced.
> I have another block I could maybe use, it had a bad head that was removed some time ago and has been sitting open without a head in place.
> decissions, decissions!
> -------------- Original message --------------
> From: LBaird119 at aol.com
> > In a message dated 8/8/2006 8:17:26 AM Pacific Standard Time,
> > engle31 at comcast.net writes:
> >
> > > I pulled the head on my 1.6 na last evening to replace the headgasket and
> > > waterpump before installing the motor in my Caddy. The underside of the head
> > > wasthick with a carbon/soot build up around the valves in the pattern of the
> > > headgasket. Each set of valves per cylinder had this thick build up. I needed
> > > a razor blade to scrape it away.
> > >
> > > Is this normal? The motor has some miles on it, but it did run before it was
> > > pulled from the Rabbit I scrapped. I've seen other heads that one could use
> > > sone cleaner to clean up the underside of the head. I'm just wondering if
> > > this is a sign of something else that should be replaced/repaired.
> > >
> > > Also are the hex headed headbolts, stretch or non-stretch type bolts?
> > >
> >
> >
> > When they're gunky (usually kinda gooey too) it's generally not
> > running right. Bad injectors, low compression, burning oil past
> > rings or valves or bad valve adjustment. COULD be from loafing
> > the engine also. Never heats up enough or runs fast enough to
> > really keep it clear. How are the back sides of the valves? They
> > might be so coked up that they'll need cleaned too.
> > Hex bolts are 11mm non stretch.
> > Loren
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