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#Post#: 2448--------------------------------------------------
Idle oil pressure
By: tomo3 Date: August 27, 2018, 6:33 am
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Hello, once or twice a year I start my Nuovo Falcone, usually
with no problems. This year, right after the start, oil warning
light came on. To be sure what's going on, I changed oil (I put
Mobile 20-50), and warning light went off, except on idle when
engine is hot. Since engine idle is adjusted very low (as most
of Falcones cca. 450 rpm), I bought a new oil indicator (it fits
from Fiat 127 903 ccm engine). The same thing happened and on
idle with hot engine the oil light is on. As soon as I rev the
engine a little bit, it goes off. Does anybody knows what's oil
pressure on idle in bars and what is oil pressure needed to turn
off the oil warning light (I can not find any datas). I wouldn't
like to have to much of expenses since the bike stands in the
garage for five years and in the future it probably will be the
same. Is it possible to repair the oil pump, or shall I simply
raise the idle speed and solve the problem with oil light?
#Post#: 2450--------------------------------------------------
Re: Idle oil pressure
By: banquo Date: August 27, 2018, 10:17 am
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I'd be worried about that Tomo. Raising the idle speed is not
fixing the problem; just disguising it by increasing the pump
speed. If the oil pressure is low at idle, and the sender unit
has the correct pressure for the NF (how do you know if it
does?) then you will have low pressure at all engine speeds. The
camshaft is only lubricated on the NF after the pressure relief
valve opens, so it's possible that if you have low oil pressure
the camshaft will never get lubricated. Possibly the problem is
the oil pump, but the other possibility is wear on the bush that
supports the crankshaft in the timing case. This bush is
required to maintain oil pressure, but it's a really bad design,
and when worn, allows the oil to leak past. Some people have
fitted an o-ring or a proper oil seal in there, as the bush
isn't required for support, only to seal, and allow oil to be
delivered to the big-end bearing. I'm sorry, but I don't have
the pressure at idle, but I think the pressure relief opens at
60 psi. Id I were you, I'd try an oil pressure gauge, so you can
see exactly what is happening. If the pressure really is low,
you risk some very expensive engine damage.
#Post#: 2451--------------------------------------------------
Re: Idle oil pressure
By: tomo3 Date: August 27, 2018, 10:52 am
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Banquo, thanks for the quick reply. I'm also worried since this
happened for the first time. I tried to run it in idle without
oil indicator (unscrewed) and very quickly engine was covered
with oil leaking from the indicator hole (so it seem to have
decent pressure in idle). I'll check the oil pressure with
diagnostic tool and decide what to do next. Even thou the bike
is not in everyday use, I'd like it to be completely functional.
If I'll have additional questions, I'll be free to ask.
#Post#: 2452--------------------------------------------------
Re: Idle oil pressure
By: banquo Date: August 27, 2018, 3:19 pm
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There's a big difference between flow and pressure. If the
pump's working, and you open the oil cavity by removing the
sender unit, then oil will flow, because you created an easy
path for it, but the lubrication system does require high
pressure oil to feed the big end bearing and the camshaft. I'm
no expert on this, but I do know the crankshaft bush is a
definite weak point. It may be worth your while to remove the
clutch cover and inspect it. Instruction in the Paul Friday
files that you can download via the links section.
#Post#: 2453--------------------------------------------------
Re: Idle oil pressure
By: cloggy Date: August 28, 2018, 12:16 pm
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I would run the idle at the same speed as a brit single so that
the bypass valve opens up and feeds the cambox. Running it low
is a party trick
#Post#: 2454--------------------------------------------------
Re: Idle oil pressure
By: banquo Date: August 28, 2018, 12:37 pm
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Relief valve isn't even thinking about opening at tickover
Cloggy. It opens at something like 60psi and pressure at idle is
more like 25 psi. I don't think the valve opens until about 3000
rpm. They say you're better thrashing the engine than
molly-coddling it for best engine life, and especially camshaft
life
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