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I had been invited
to participate, along with fourteen other vintage Rolls-Royce open
tourers, in the drivers' parade around the grand prix circuit ahead
of the Formula One event at Silverstone on Sunday, June 11th, 2006.
The same car was booked into its class at the RREC Annual Rally at
Kelmarsh Hall a week later.
The car, a 1929 replica bodied, 20/25, GDP 38, was in fine shape.
The day before the big day, I had started the final preparation of
the car. It was very hot and I was sweating after much polishing of
nickel and brass parts, but not nearly half as much as I was to experience
later.
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I wanted
to move the car off the hydraulic lift and drive it around to
another part of the garage. With starting carburetter open,
ignition switch on, timing fully retarded, hand throttle closed
down, the foot-operated starter motor switch was engaged. It
fired first time as is normal but through the rear view mirror
I noticed clouds of white 'smoke' at the back of the car. This
should not have been happening and when I closed down the starting
carburetter it persisted and the engine ran as if it were fully
warmed up. The cloud of what then became clear to be petrol
vapour continued but was not quite as bad when I fully closed
the mixture strength lever on the steering column hand controls.
Having done this, the engine should have stalled through fuel
starvation and low engine temperature, but it didn't.
I stopped
the engine, opened up the bonnet to inspect the carburettor.
Its overflow pipe was dripping profusely on to and through the
undertray and coming to rest in an oil tray on the garage floor.
I opened up the float chamber, could see nothing wrong, reassembled
it and restarted the car. The petrol fumes emerging from the
exhaust pipe were still strongly evident. I revved the engine,
hoping this might cure the problem but to no avail. I drove
the car round to the other side of the garage where it straddled
another line of oil trays and left the engine running on fairly
high revs. I returned to the house to wash my hands and to gather
some more cleaning rags. Two minutes later I was back in the
garage, the engine was still running and the water temperature
was around 60 degrees Fahrenheit by now.
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GDP
38 Fire damage to bonnet. GAK 5 in the background
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Orange
Light.
I could still
sense the high concentration of unburned fuel in the exhaust gases.
One last attempt to blow away the problem, I thought, and, bending
over into the footwell on the driver's side to press my hand on the
accelerator pedal, I noticed orange light through holes in the firewall!
This was no orange light. It was a fire!
My first reaction, other than the strongly murmured expletives, was
to switch off the engine, close the fuel tap and then to move to the
passenger side of the engine area to see what was happening. A developing
fire in the engine bay and the oil tray beneath caused enormous concern.
The fire from the oil tray with its mix of oil and petrol seemed destined
to cause extensive fire damage to this car and to the other three
cars in the garage, not to mention the garage itself, should a chain
reaction of car fires become unstoppable. My thought at the time was
to push the car backwards off the flaming oil tray and out of the
garage into the open air. Despite all determination and being steeped
in adrenalin by now, my strength and power were to prove a mismatch
for the inertia of the car, not helped by the poor friction between
leather soled shoes and a painted concrete garage floor. By this time
thick black smoke was emerging from beneath the engine bay and from
every orifice thereabouts and the front end of the car was becoming
very hot indeed.
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Panic
Prevails.
I shouted
out for my wife, Christine, who I knew was tending the vegetable
patch nearby. With her help and fitness, successfully pushing
the burning car away from the oil tray was more probable. Sadly
she is deaf in one ear. My calls for help and the exclamation
that we had a fire were now more than tinged with panic. A neighbour,
some 40 metres away, could hear me shouting for Christine. She
told me later that she thought Christine was responsible for
a barbecue ( after all, it was lunchtime ), that she had forgotten
about it and that the whole pile of meat was about to become
an unsightly, inedible pile of almost pure carbon waste. She
was right about a barbecue of course; "The Best Barbecue
in the World"!
Christine
finally arrived after what seemed five minutes but was probably
no more than 60 seconds. She ran to the hose pipe connected
permanently to the tap in the garage and, having turned it on,
rushed to the car. Within 10 seconds, thanks to her, the fire
was extinguished. Is it not strange that in such a situation
as this it is easy to be focussed on one method, not necessarily
the correct one, of overcoming a problem? For me it was to push
the car into the open air to prevent more extensive and perhaps
untold damage. Christine exercised better judgement in my opinion;
without doubt, her method worked almost instantly. In the meantime,
I was partly scorched and looked decidedly speckled with soot,
particularly in the face, arms and chest areas. My hair looked
as though I had been given an instant dark rinse!
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Damage
to nearside wing
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A
good Cup of Tea and a Closer Inspection.
After the emotion
had diminished over a cup of tea, I returned to the scene of 'the
barbecue'. What a mess. That lovely, silver coloured bonnet and part
of the nearside wing had copped for it as can be seen from the photographs.
A peer under the bonnet revealed a ghastly sight. Just about every
aspect of the engine and chassis in this area was blackened. This
was devastating for me; I keep my engine bays looking pristine at
all times on all cars.
I immediately
e-mailed the organisers at Silverstone to inform them of my disaster
and to apologise for my absence the following day. On the Sunday morning,
a closer inspection was called for. The fire appeared to emanate from
the nearside rear part of the engine bay. Christine had said to me
that she had to extinguish flames on the exhaust in the region of
the starter motor. Clearly the strong heat from the exhaust manifold
and down-pipe had probably caused the evaporating petrol from the
oil tray and perhaps a still dripping overflow pipe from the carburettor,
to reach combustion threshold. The oil would have exacerbated the
problem. Certainly, damage was worse on the exhaust manifold side
of the engine. The wires to the dynamo and to the starter motor had
been deprived of their insulating sheaths and on the driver's side
the feed wire to the induction coil had suffered a similar fate. Perhaps
there had been damage to the starter motor itself. Luckily, the magneto
was not in situ. I had visions of a burned front tyre and blistered
wheel rim, but these had escaped damage.
The
Nervous Trial, the Quick Fix and the Rapid Response.
Very cautiously
I turned the engine using the starter motor and with the ignition
on. She fired up straightaway and there was no sign of clouds of fuel
leaving the exhaust pipe. My impression of the damage, other than
to the paintwork on the bonnet and nearside wing was soot, what appeared
to be a few bare wires and a roasted Autovac. By early Monday morning,
the insurance company had been informed, a retired autoelectrician
friend was on his way to assess damage to the wiring and starter motor
and a reliable paint shop lined up to perform the repairs as quickly
as possible. By Monday afternoon, the starter motor had been stripped
down, checked out, cleaned of all the soot, declared fit for purpose
and re-installed with a fresh positive feed cable, the three wires
to the dynamo had been replaced and a jury rig feed to the induction
coil connected up so that at least I could drive the car from near
Nottingham to Chesterfield for the paint man and the insurance inspector
to do their respective jobs. Incidentally, since the vertical bonnet
panel on the nearside had suffered the worst of the intense heat and
was confined on all four sides by chassis, radiator, scuttle and an
upper bonnet panel, expansion of the aluminium caused it to buckle
with no return to its former self on cooling. This was another job
for the paint repair man along with a thorough removal of all soot.
The total task for him was bigger than I had first thought. I have
to say, however, that the RREC club insurers were on the ball straightaway,
repairs given the green light by Wednesday and I had possession of
the car by Friday morning. Admittedly, Terry Jones, the "Autofit"
paintwork expert had done a great deal of groundwork in removing the
bonnet and autovac and commencing the soot removal in anticipation
of some sort of formal approval by the insurers, but nevertheless
the time scale of events was nothing but impressive. The further rewiring
of parts of the engine bay and an inspection of wires in the conduits
on either side of the forward parts of the chassis and replacement
where necessary came later.
The car looks
its normal, striking self once more and all I can say is that under
the circumstances I was lucky not to have suffered far, far more damage
in the garage not to mention bodily damage on my part and that of
Christine.
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Soot
damage to engine, rocker cover and partially cleaned cylinder
head. Note bare wires to dynamo. Under the soot, the autovac
is badley blistered.
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Driver's
side: not as much damage here, but note thr jury rig of wire
to induction coil. Engine and steering column partially cleaned.
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Lessons
To Be Learned.
1) If, unexpectedly, profuse quantities of petrol are puthering out
of the exhaust, you have a float chamber jet that is not seating properly.
2) Turn off the ignition to prevent the engine warming up and shut
off the petrol to stem the flow of fuel from the autovac to the float
chamber.
3) Do not under any circumstances leave the engine running either
on high speed idling or even low speed idling. The hotter the engine
gets, in particular the exhaust manifold, the closer the evaporating,
spilled fuel will get to combustion threshold.
4) Open up the float chamber and suck out all fuel using a pipette.
5) Using a pipette and clean petrol, flush away any microscopic particles
from the needle seating which probably caused the needle jet to remain
partially open in the first place. A problem here is that the offending
particle may be invisible to the eye. Repeated flushing and sucking
out is probably safer.
6) Reassemble the float chamber, turn on the fuel tap and turn the
engine using the starting handle to draw fuel into the carburettor.
7) Observe the overflow pipe from the carburettor to ascertain if
the problem persists. If it does, repeat the cleansing process.
8) Only when confident that the float chamber is now full of fuel
and the overflow problem has been arrested should you attempt to fire
up the engine.
9) When the engine is restarted, look and smell for excessive amounts
of unburned fuel in the exhaust. Additionally, be quick to test the
mixture strength by closing down the starting carburettor and then
fully weaken off the mixture using the hand controls. If the engine
fails to continue, you have probably overcome the problem. If the
engine continues to function, it is likely that the problem persists.
10) If you use oil trays beneath your engine or if you have an oil
slick on the garage floor, ensure that as a matter of good garage
practice, any oil is removed on a regular basis, thus reducing potential
fire hazards.
11) Invest in at least one free standing or wall-mounted fire extinguisher
and ritualise a series of fire emergency scenarios. Furthermore, regular
mental rehearsal of such scenarios will pay dividends should a fire
event occur.
12) A close friend has told me since that the petrol we buy, on account
of the fact that it possibly comes from a desert in The Gulf, will
possibly have a very fine sand sediment in it. Modern cars have a
modern in-line filter in the fuel lines and although we may have the
traditional, but rather crude, filter between the autovac and the
carburettor, it might be prudent to install discreetly one of the
modern types as well.
With hindsight,
there was a give away sign right from time zero. Starting the engine
from cold and using the starting carburettor and going through the
much practiced ritual of retarded ignition and zero idling speed on
the hand controls, the low key thumping I sensed both by ear and by
touch on the controls was evidence of over-choking. Be sensitive to
this and stop the engine immediately if this occurs.
In a shock situation
as I found myself in, panic may develop and all the good habits and
practices you know about are likely to evaporate almost instantly.
You know where the fire extinguishers are but you may engage in a
totally different solution strategy which may or may not be productive.
My reaction; to push the car backwards out of the garage, failed miserably.
Thank God Christine was not too far away. Not all wives are close
by at the time of an emergency and if by chance they are, they may
not be able to run as fast as Christine.
PS. I cannot fault
the insurers, Equity Red Star through Richardson Hosken, the RREC
insurance broker. They have been most efficient, helpful and extremely
sympathetic.
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