On Mon, 17 Oct 2011 09:32:48 -0700 (PDT), banksie
<
martinl...@gmail.com> wrote:
>Our Kabola Old English stove with back boiler has recently been moved
>and this process would now seem to induced an air lock - or something.
I have had a Kabola for some time (different model). Its fuel is
gravity fed, with the bottom of the fuel tank not much higher than the
regulator.
The first question I would ask you is "Is the new position of the
stove higher (even slightly) than the old?". If so, the reduction in
head may be making the oil reluctant to flow. Also, are you sure the
regulator is (still) absolutely level (unless you have a marine, i.e.
gimballed, one)? If not, the fuel level in the float chamber will
effectively have been changed, and may no longer be high enough to
flow over the little weir which regulates the flow into the line to
the burner pot.
However, over the years I have found that the oil line from the tank
to the regulator does occasionally get blocked. Causes have been:
1. The filter needs replacing (there is a standard CAV one at the tank
end of the line on mine).
2. There are bits of stuff in the line, despite the filter (who knows
where they come from?). To remedy this, I attach a bicycle tire pump
to the filter end (downstream of the filter), undo the regulator end
from the regulator, and pump all the fuel out of the line with air.
The crud is usually clearly visible. I then reconnect the filter end,
open the valve, and check that oil flows out of the regulator end.
3. There is crud in the regulator. Despite the warnings, I have
trained myself to take the thing apart for cleaning. Kuranda would
probably shudder, but my approach has worked (so far).
In my regulator, there is a little permanent tubular filter under the
regulator body which is easy to remove (single screw-in plug). This
can be cleaned by rinsing in clean diesel. While its out, I blow
through the regulator body from the oil inlet, clearing the gallery to
the filter chamber.
Inside the regulator, it is possible for crud to clog the needle
valve. To get at this, I take the regulator right off the stove,
dismantle it, and clean out and blow through everything. There is
often a little water in the float bowl, which can become a problem in
time. Taking care not to disrupt the adjustments, of course, although
I have taught myself how to fiddle with these (somewhat) over the
years too.
In addition to all that, carbon can accumulate where the fuel line
enters the burner pot. On my stove, there is a scraper inside this
line which can be rotated to dislodge the carbon. This should be done
weekly. I've found it's not that effective though, so I remove it and
poke a very thing but long screwdirver right through the pipe to
dislodge the carbon.
Finally, the burner pot should be cleaned annually (after which you
will need a bath).
These stoves work well, but do need looking after. Next time, I will
buy a pressure-jet one, though.
Have fun.
Adrian
Adrian Stott
Tel. UK (0)7956-299966