Le Mans Unusual Noise |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Never liked liquid manometers for this reason...
Before going mad dismantling things, are valve clearances correct? Also what about other adjustments, ignition timing, carburettors etc. - balancing of which is what the manometer is for - won't tell you if it's pinking or not tho unfortunately, nor the fuel mixture strength. |
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"Chicken nuggets don't dance on a Tuesday."
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kateguy
Senior Member Joined: 24 Nov 2014 Location: uk Status: Offline Points: 984 |
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Check you aint simply got a tight tappet holding a valve open first....
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Moto Guzzi Club GB.....
850 LE MANS...1 & 2....V7 Loop Frame..V7 Sport replica...Guzzi Daytona...Ducati 900ss Bevel not belt.....Laverda 3C ....and an MZ... |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Exactly!
It occurred to me the rattling on the left is merely the LH cyl. tappets working normally! Or another way of putting it, RH side is unusually quiet... Edited by Mike H - 25 Apr 2017 at 15:28 |
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"Chicken nuggets don't dance on a Tuesday."
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GuzziPaul
Senior Member Joined: 10 Oct 2015 Location: Essex Status: Offline Points: 219 |
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Stripped the RHS pot down and had the valves out, using a magnifying glass (left eye is still a problem) managed to identify the exhaust valve had a little bit of carbon ridge on it. Cleaned it up by lapping the valve (did the intake as well).
All back together now and did a quick compression test and both sides are now roughly equal around 150. Not run it up yet, that a job for tomorrow.
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GuzziPaul
Senior Member Joined: 10 Oct 2015 Location: Essex Status: Offline Points: 219 |
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Although I still have an eye problem I took the bike for its MOT (passed no problem). Now I can actually ride it rather than just playing with it in the garage the noise is still there.
I've had the bike for a year and a bit and thinking about it the noise has always been there, I just put it down to the "usual" Guzzi noises, it is definitely noisier on the left side than the right, despite multiple attempts at valve adjustment. I'm now thinking "small end" . Might strip the left side tomorrow and see if there is any "wibble" on the piston (fore and aft) but not take the gudgeon pin out. Any other way of identifying small end failure?
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Ken-Guzzibear
Moderator Group Joined: 13 May 2014 Location: Sileby Leics Status: Offline Points: 9454 |
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I have had a Gudgeon pin circlip go they wear from the inside Guzziology recommends replacement when ever the engine is apart ..... when they let go it stuffs the bore big time
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The Older i Get, The Better I Was
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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You've reminded me there was a story years back that the cams are not all quite alike, firstly they are supposed to be ramp cams, meaning the 'slack' is taken up smoothly by a shallow rise before the lobe proper comes around, but the story said not quite for lefthand exhaust so it always rattled more than the others. When I had not long had my Spada I was always fiddling with the tappets trying to get them quieter, someone else another Guzzi owner saw me doing this one day and basically said you're wasting your time you can't achieve it. |
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"Chicken nuggets don't dance on a Tuesday."
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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If you don't remove the pin and piston it may be difficult to tell where any "wibble" originates.Pin to small end or pin to piston.Just a thought. |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
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theoneandonly
Senior Member Joined: 24 Jul 2014 Location: london Status: Offline Points: 661 |
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have you put your fingers against the carb slides when it is running ?
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http://baldricksworkshop.co.uk/ motorcycle slut, if it has wheels and an engine , i will ride it . |
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GuzziPaul
Senior Member Joined: 10 Oct 2015 Location: Essex Status: Offline Points: 219 |
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No what will this tell me? what am I looking for?
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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And, how do you do that then?
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"Chicken nuggets don't dance on a Tuesday."
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cyclobutch
Senior Member Joined: 08 Sep 2015 Location: Essex Branch Status: Offline Points: 750 |
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Unscrew and remove the bell mouths. Stick your fingers in the back.
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Butch
V50 II - 'The Black Pearl' T3 - 'Blue' Eldo Loop - 'Jug' |
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Dukedesmo
Senior Member Joined: 17 Apr 2015 Location: Leics Status: Offline Points: 856 |
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When I rebuilt my Lemans engine after the pistons hit the exhaust valves, I found one of the little end bushes (LH side) was loose in the rod. I think it had been like that for some time rather than caused by the piston/valve interface and it didn't seem to be causing any problem, hadn't noticed any noise but I replaced it anyway.
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Le Mans 2
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theoneandonly
Senior Member Joined: 24 Jul 2014 Location: london Status: Offline Points: 661 |
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a knocking carb slide makes a noise just like a cam follower dieing
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https://www.facebook.com/BaldricksWorkshop
http://baldricksworkshop.co.uk/ motorcycle slut, if it has wheels and an engine , i will ride it . |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Oh right yes of course. (Forgot a LM was like that ) |
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"Chicken nuggets don't dance on a Tuesday."
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