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#Post#: 2717--------------------------------------------------
splitting crankcases
By: trophy Date: November 6, 2019, 3:01 pm
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Hello all. New to the forum. Am splitting the crankcases for a
friends 1974 Nuovo Francone, an ex military bike. Cylinder and
top end no problems but am having trouble removing the pinion
(the one driven by the main pinion) from the crankshaft. Clutch
assembly. oil pump, camshaft all removed OK. I have a good 2
legged puller on the pinion with plenty of pressure applied,
have tapped the puller head and also applied a smallish amount
of heat but no result. Any suggestions? I have a 3 legged
puller on order to see if that helps.
Are there any hidden fasteners etc that I need to know about to
let me split the cases? Drawings on the engine seems very
sparse.
All suggestions gratefully received.
#Post#: 2718--------------------------------------------------
Re: splitting crankcases
By: trophy Date: November 8, 2019, 2:53 pm
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Hello again. Pleased to report the heavier 3 legged puller
worked. Removing the pinion from the crankshaft showed that the
main bearing ball cage is breaking up, so that needs changing.
More advice please on the following and I say again that I have
never worked on this type of engine before, hence the asking for
advice; 1) Does the crankshaft have a sludge trap fitted? 2)
The exhaust valve guide is well worn, as is its valve only less
so. Both need to be changed. The inlet valve and guide are
good. 3) All piston rings are well down on gap sizes,
especially the oil ring. They will be changed. 4) The bush in
the primary case where the mains oil feed into the
crankshaft-and the crankshaft end that mates with the bush are
badly scored. I will need to re-face the crankshaft end and
make a bush to suit. Can anyone advise what clearance the bush
needs? 5) Where should I go to for the required spares? 6) Is
there a site where I can find engine details/drawings etc as
there seems to be no manuals in English, apart from Martin
Noke's which is not detailed enough.
Thanks in anticipation.
#Post#: 2720--------------------------------------------------
Re: splitting crankcases
By: banquo Date: November 10, 2019, 5:42 pm
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Sorry for the delay in repying; as you have discovered, we don't
get much traffic on here.
I've only ever had the top end off, so can't really help with
the bottom end.
The bush in the clutch casing is a known weak point, and wear
results in loss of oil pressure. Some have replaced it with an
oil seal, but it needs to withstand full oil pressure, as the
oil gallery is behind it. It's never going to work well with a
bush, as it can't be guaranteed it's in line with the crank, and
of course there will be run-out on the crank too. I don't THINK
there's a sludge trap, as the strainer should be designed to
eliminate the need, but I'm not sure. The manuals and parts
books are available via links in the Links section. Only the
rider handbook is available in English. Workshop Manual is in
Italian, but has many diagrams and dimensions.
Glad you got the pinion off OK.
Also on the links section there should be a link to the advrider
thread by Leafman, which gets a lot more traffic than here, and
some serial engine workers who should be able to help out. I'd
try there, in case nobody chips in here
#Post#: 2722--------------------------------------------------
Re: splitting crankcases
By: trophy Date: November 11, 2019, 7:27 am
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[quote author=banquo link=topic=419.msg2720#msg2720
date=1573429360]
Sorry for the delay in repying; as you have discovered, we don't
get much traffic on here.
I've only ever had the top end off, so can't really help with
the bottom end.
The bush in the clutch casing is a known weak point, and wear
results in loss of oil pressure. Some have replaced it with an
oil seal, but it needs to withstand full oil pressure, as the
oil gallery is behind it. It's never going to work well with a
bush, as it can't be guaranteed it's in line with the crank, and
of course there will be run-out on the crank too. I don't THINK
there's a sludge trap, as the strainer should be designed to
eliminate the need, but I'm not sure. The manuals and parts
books are available via links in the Links section. Only the
rider handbook is available in English. Workshop Manual is in
Italian, but has many diagrams and dimensions.
Glad you got the pinion off OK.
Also on the links section there should be a link to the advrider
thread by Leafman, which gets a lot more traffic than here, and
some serial engine workers who should be able to help out. I'd
try there, in case nobody chips in here
[/quote]
Many thanks Banquo. Your input is much appreciated. The
crankcases are still refusing to come apart completely, just a 1
mm gap, and that's after spending 6 hrs on it yesterday. I
believe the problem is that the lower locating dowel on the
mating faces of the crankcases is sticking (corrosion?) so I
have left it overnight soaking with WD40. I will have a look at
Leafman's advrider as you suggest, thanks again.
#Post#: 2723--------------------------------------------------
Re: splitting crankcases
By: banquo Date: November 11, 2019, 7:30 am
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No bother at all; sorry I couldn't be more help.
1mm sounds good - at least they're not stuck at the faces :o
#Post#: 2738--------------------------------------------------
Re: splitting crankcases
By: olebmw Date: December 20, 2019, 11:17 am
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Mine has a sludge trap on the crank.You'll see it when you get
it apart.
Make sure that something other than the dowel pin is keeping it
from parting.
#Post#: 2739--------------------------------------------------
Re: splitting crankcases
By: banquo Date: December 20, 2019, 12:01 pm
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Thanks olebmw; I stand corrected (a not unusual occurrence!)
#Post#: 2986--------------------------------------------------
Re: splitting crankcases
By: Sigean Date: May 28, 2025, 11:22 am
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Hi,
I am having exactly the same problem with my own Falcone's
crankcases - stuck firm! How did you get yours apart in the
end?
Any advice welcome...
Sigean
#Post#: 2987--------------------------------------------------
Re: splitting crankcases
By: Sigean Date: May 29, 2025, 9:01 am
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....and advice not needed. It took a long time, but heat and
verrrry gentle leverage were my friends. One of the location
dowels was somewhat corroded and this caused the problem. Now
to check the internals!
Sigean
#Post#: 2988--------------------------------------------------
Re: splitting crankcases
By: banquo Date: May 29, 2025, 3:41 pm
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Great result: patience rewarded! 8)
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