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XTZ 660 Dry sump has become wet sump! XTZ 660 Dry sump has become wet sump!
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 10 Jul 2007
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XTZ 660 Dry sump has become wet sump!
I've just aquired this 96 bike and oil is pissing out of the breather pipe into the air box. It seems some oil is returning to the frame/tank, but not enough and the crank is filling with oil. So it seems there is a problem on the scavenging side of the oil system.
I don't have a manual yet so is there anything obvious anyone can suggest to check?
Thanks.
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  #2  
Old 10 Jul 2007
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Well, I don't know your bike/engine but you could start by reading here;-

http://www.horizonsunlimited.com/hub...al-stuff-27640

for general advice. Someone more qualified will come along to tell you more.
In the meantime, you don't say anything about the history of the bike; mileage, general condition etc etc and that is relevant, very relevant.

Welcome to here by the way!!

Dave
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  #3  
Old 11 Jul 2007
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Well
assuming you rode it for a while; if insufficient oil is returned to the tank the result is that the primary oil pump will eventually get no oil, with the related stop in lubrication of crankshaft, piston, camshaft etc. This in turn would have been noticeable immediately :-).
How do you know the oil accumulates in the crankcase?

First check that the engine has not been overfilled. Checking oil level on these bikes has a certain wizardry to it, and you would not be the first getting it wrong and overfilling. -> see other posts.

Auke
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  #4  
Old 11 Jul 2007
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Thanks and thanks for the welcome.
I am pretty well versed on motorcycle mechanics but in the absence of a manual I thought I would try here first in case anyone else had had the same problem.
This is not a minor case of fluctuating oil levels. When oil is added and the engine started the oil level drops very quickly and starts blowing out of the breather so it is obviously flooding the cranckcase. Some oil is returning top the tank but not enough. I suspect a stuck return valve or pressure release valve or broken internal pipe. The return pipe is located under the starter motor. Is there a seperate oil scavenge pump here to return oil to the tank?

Does anyone know where I can get a manual. It is a 1996 XTZ660

Thanks.
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  #5  
Old 12 Jul 2007
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Mmmm ...
In order really to be 'pumped' (as opposed to being taking into the gas stream from increased blow by) through the breather hose you would have to fill the crankcase with oil up to about the level of the oil filter. Would be (guess) something like 12 liters, unlikely.
The oil pump is actually two pumps, no. 1 lubricating crankshaft and highly critical parts, no. 2 scavenging and lubricating gearbox, clutch etc. No. 1 has a non-return valve, no. 2 does not.

My order of checks would be:
1 - Check oil level -> see earlier posts
2 - Check for increased blow-by or other sources of combustion gas entering in the crankcase: worn valve seals, rings, head or base gasket blown

for pump no. 1 scheme is (german):www.xt600.de Ölkreislauf - Special

for pump no. 2 scheme is
www.xt600.de Ölkreislauf - Special

The case ventilation goes through the balancer shaft (on the level of the oil filter) where the gases cool off, oil vapour is separated and supposed to run back into the crankcase. Only, if the gas flows increase with a worn engine, oil droplets will be taken into the flwo and exit through breather hose.

Auke
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  #6  
Old 13 Jul 2007
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Thanks Auke

The schematics were very helpful, although my German is not good.
Your posting prompted me to drain the cranckcase and out drained an amazing 6 litres from the 'dry' sump. I then topped up the tank and ran the engine on tickover for 3 minutes, then drained the tank of another 2 litres of oil. During this time there was, at least, no oil discharging from the breather, so I think blow by can be ruled out. So at least I know it's a scavenge system problem. I've managed to find a manual on ebay so will look further when that arrives.

bob
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