1973 3C crankcase mods, advice needed.

pf1 said:
So help me understand this, if the hole in the top of the crankcase has been blocked with a ball bearing or something to divert oil to the cooler how did oil get into the gallery under the barrels?
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Seems they've simply copied the original LH supply bore to the gallery.

Looks like an ugly POS to me. Going to be a real challenge getting all that lined back up, probably lots of surprises that are not yet evident.

piet
 
Didnt some bikes come with both early vertical rear shock mounts and later leaned forward shock mounts on the same frame, or is that a memory fail for me?
 
I think there might have been a few in the transition between the shock position change that had both mounts. Just a vague memory of seeing a pic of a bike with both mounts and comments saying there are a few like that.
 
The 1200 started it, a modified 3CL frame with an additional top shock mount. Same frame was used for all following 180° triples. A pity the lifting handle had to go to make room for the shock.

piet
 
pf1 said:
So help me understand this, if the hole in the top of the crankcase has been blocked with a ball bearing or something to divert oil to the cooler how did oil get into the gallery under the barrels?
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I'd guess from the oil cooler return, otherwise it'd start rattling PDQ.
 
Vince said:
I think there might have been a few in the transition between the shock position change that had both mounts. Just a vague memory of seeing a pic of a bike with both mounts and comments saying there are a few like that.
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Indeed, there were, Vince.

Rear shocks both.jpg
 
the feed from the oil pump to the base gallerry will be evident when you grind off the boss, that ball bearing is not blocking the factory chanel to the gallery, right where your boss is, there is (was) a factory peened in ball bearing, (on oil cooler types. It will become clear when you have got rid off the boss. it is a direct feed from oil pump to gallerry. the other boss for the exit from the cooler can go entirely, with no cooler, there are no external pipes, the pump fills the gallerry and feeds the cams and centre mains, then everything drains by multiple routes back into the wet sump by gravity. The rear shock mounts look like drummer type, they drop a bit lower than normal upright shock triples, maybe at a later date the shocks were 10mm longer, the front shock mounts (somehow) look added to me, no surprise there since the lowered seat rails did involve quite a bit of welding, it was popular in the 70's on twins and tripes to add the front shock mounts and lay them forward, sometimes also to move the mount on the swingarm a tad closer to the wheel spindle as well (very RG500) the twin stiffening flanges behind the left cylinder also point to it being a drummer, it is known that a few special order drummers were built for those that wanted the drum instead of the discs, which they didnt trust, hydraulic and all that, non operational in the wet and they look sooooo modern, but maybe those bikes were simply conversions from normal disc braked triples without the little tell tale drummer only bits on them.

Marco give us the heads up on chassis number 1304.
pics later as had to put battery of SLR on charge..
CLEM
 
I already asked Marco and 1306 (I think) is a drummer but as he said, nobody knows if it started out that way. It's a shame there are no records anywhere, people usually take photos of their new pride and joy but they have probably gone for good now with the passing of time. I don't have all the parts to build one anyway.
I do have the names and addresses of all the previous owners though and if I remember correctly the first owner ran a restaurant/bar in Turin. I've had a look at the address on Google earth and it's quite a run down area now. Looks almost as bad as the bike. He didn't keep the bike long and it soon changed hands.
 
here are some usefull pictures
 

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pic1, the black bud shows the entry to the cases from the oil pump
pic2 shows exit to by pass sealed by an oval ring.
pic3is the entry to the cylinder base oil gallerry
pic4(cases upside down) on non cooler bikes this drilling goes straight to the gallery, on cooler type (as this) the shaded part was added to take the oil to the extrenal hose which is the entry the cooler
pic5 arrowed is flow direction and entry to cooler the dot with a circle is where the gallerry entry on non coolere types will be
pic6 the two white buds show the entry to the gallery for cooler types and the direction of flow.


so (basically) grind away the boss on the left side of the cases and you should be able to clear the oil way from the by pass straight to the gallery and weld up the redundant hole, the other end is simply a case of grinding the boss off and welding the hole up.

CLEM
 
I think you are right Clem, the right hand cooler connection and drillings can be welded up because they aren't needed any more. I would say there were originally two feeds to the gallery from the pump on the early bikes and both of them have been blocked on mine. I will have to unblock these and weld up the drilling for the connection of the left hand cooler connection.
Looks like I have a couple of repaired head stud threads in the cases too.
That hole in your pic 5 isn't there in my later 1200 cases (see pics below)
I'm assuming in the later bikes the oil fed the cooler before the gallery as mine must have done?

3c1.jpg

3c2.jpg

3c3.jpg

3c4.jpg
 
pf1 said:
The cases are welded up, need a bit of texturising now to make them look sandcast.
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Sweet Pat. Re texturing, in the back of my memory I remember reading or being told about someone needing to do the same thing to match the sand casting.

They used very coarse sand paper placed over the smooth surface and went to town with a wooden mallet.
 
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