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Con Rod orientation

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    Posted: 29 Jan 2017 at 06:06
Does anyone know the orientation of the conrods on the crank with regard to the oil holes on the side of the Rod which aim at the piston skirt. Foolishly stripped without taking pictures.
I've checked the manual but no pictures of the crank and rods in detail.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Android Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 06:18


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 09:06
Can't answer specifically, but I would have thought the oil should be squirted on the thrust face of the cylinder. The crank turns clockwise as seen in your picture? Then the con rod is assembled correctly as I see it.
Might be talking rubbish of course.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 11:22
According to Chiltons Guide,the orientation is as follows.
Oil passage facing upwards on the left hand cylinders rod and downwards on the right hand rod.This guide is for Loop Frame models.I don't know if this was ever changed, or why it would be.I hope this helps.

Edited by Dave P. - 29 Jan 2017 at 11:26
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 11:37
Looking in a later Tonti manual it states that looking from the clutch end the oil holes must face the right; which amounts to the same thing as the above statement.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Android Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 11:39
Brilliant thanks Dave
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 11:56
Originally posted by Dave P. Dave P. wrote:

Looking in a later Tonti manual it states that looking from the clutch end the oil holes must face the right; which amounts to the same thing as the above statement.
I wasn't talking rubbish then.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 12:00
No Brian,your logic was spot on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 12:42
Don't know if the same or relevant but I recently changed the big end shells on my LM2 (despite them looking fine but as a precaution due to piston/valve interface).

I made a note of which way they were so that I could refit the same way & same position. 

The reference I used was that the con rods have 'Moto Guzzi' cast into one side and mine were/are fitted with this writing facing each other, i.e. RH/front rod with 'Moto Guzzi' facing backwards and the LH/rear rod with 'Moto Guzzi' facing forwards.  

I don't recall the oil passage orientation but assume it must be correct? Unless of course they were the wrong way round from the factory, in which case no harm done as the shells/crank etc. were still in great shape and (although I can't be sure) in only 12k miles from new I doubt they'd been changed before...     
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 12:57
Can you always be sure that it was assembled correctly in the first place by whoever.

Maybe that's why some of these situations occur.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 13:06
Originally posted by red leader one red leader one wrote:

Can you always be sure that it was assembled correctly in the first place by whoever.

Maybe that's why some of these situations occur.



This is off topic but relevant to the above.
Yesterday I re-wired a 1938 Norton ES2.The new harness was a brand new genuine Lucas cloth covered item.I couldn't understand why the rear light stayed on even with the switch in the off position.After some head scratching, I realised that the person who had assembled the harness had transposed a Brown/green wire with a brown/blue.Perhaps a colour blindness test should be instituted at the factory
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 19:01
Didn't even know the big end had a hole 'speshly for the oil to come out - I just assumed it leaked out around the sides



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Android Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 19:12
There are 2 cross holes in the main crank pin and part way through the rotation oil will be squirted at the bottom of the piston. Probably aids cooling.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2017 at 22:44
Of course that requires the hole in the shells to line up with the one in the con rod.
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