Wildguzzi.com
General Category => General Discussion => Topic started by: pyoungbl on March 14, 2016, 03:08:32 PM
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I know that Pete Roper has mentioned that some V7s tend to burn oil. Recently I met an owner who is having this problem with her '10 model. Her bike will occasionally start to blow smoke like a fog machine, telling me that it's coming from the air box into the combustion chamber. Has anyone figured out why this is happening to some, not all, V7s of that era. Guzzi did something to correct the problem since the newer bikes do not seem to suffer like this. What's the solution? She has already thrown money at the problem, taking the bike to at least two different Guzzi dealers and an inspection by a Guzzi rep...still no solution found. Ideas?
Peter Y.
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Where does she keep the oil level?
Has she bought a sump spacer?
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This is one of the great mysteries of small-blockdom!
Some bikes can, suddenly and with no warning, drink an entire sump full of oil with no warning! The difference in this case is that there is evidence of where the oil is going, it's obviously being burnt. The weird thing is that in many cases there is no evidence. Even when the engine is stripped subsequent to it running its big ends, (The usual result.) the combustion chambers are clean, the plugs aren't covered in carbon and the piston decks rarely look washed!
What is particularly vexing is that bikes can behave perfectly normally for years and then with no change of usage suddenly do it and kill themselves stone dead! To my mind it has to be ring related as when the piston and ring design was changed with the arrival of the single TB models the problem vanished and has never recurred to the best of my knowledge.
In this case it is obvious that oil is being burnt. The question is is this the result of the crankcase pressurising and blowing the oil into the breather box which is then filling up and poring it into the inlet tracts and thence to the cylinders through the inlet valves or is it being pumped up past the rings?
First thing in my book would be to make sure the breather system wasn't clogged. After that it would be time to whip the heads and barrels off for a looksee. It might be something as simple as a gasket burnt through to a pushrod tunnel. We're the heads ever RE-torqued at first service?
Pete
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My wife's 750 Breva small block has used oil from new.
No smoke or any obvious sign of oil consumption, it just goes down and needs to be topped up every now and then. The bike has done 90,000 klms and is still going strong. We've had no issues with it apart from a couple of neutral switches and relays over the years.
Mike
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Rocker, she had a sump spacer and the Guzzi rep thought that the spacer was the problem. I know, dumb. She removed the spacer at their suggestion but the problem is still there.