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Oil leak proving hard to find on 1200 sport

guzziwranger

guzziwranger

Just got it firing!
Joined
Jun 5, 2014
Messages
13
Location
Brisbane Australia
Hi all, hoping you might have some ideas for finding an oil leak my bike developed recently. I have a 2012 1200 sport with 32K on the clock. The leak is not a real bad one yet; but I am finding it hard to pin point the source? I could see some oil seeping around from behind the bottom of the LHS piston barrel after a long ride (1000km/s over two days)? So I pulled the tank and air box off when I got home, so I could get a better look. I found some oil pooled in the very bottom of the "V" on the top of the crankcase in the casting indentations between the barrels and then when they filled up it has ran over the shoulder of the crankcase fanned by the air rush and then became noticeable on the side of the crank case just in front of the LHS barrel? When I had a good look with the tank and airbox off, I thought the source was oil dripping from the hose clamp(s) at the top of the air box oil vapor collector? As the hose clamps had oil on them. So I tightened these up and cleaned all the the oil away. However after 1500Km/s of continuous running its come back. It must be something else like the oil pressure sender perhaps as that's in the vicinity? Anybody had a similar issue and can shed some light perhaps? I am going to have to pull the tank and air box again for another look..... I did carefully check the braded oil lines last time as another potential source and they seemed OK also?

Any help would be good.

Cheers all, Paul.
 
The oil pressure sending unit is the most likely. However, the best thing is to clean everything, then run the bike a short distance (20Km or so) and re-inspect. Did you make sure the connection for the oil lines were tight? I realize it is a bit of a hassle, but the only way to isolate the problem for sure. Also if you place some talcum powder around the sender and oil lines it will make the leak very evident when it occurs.
 
Hi John, no to be honest I didn't actually physically check the oil hoses for correct torque. So good point... when I pull the tank and air box again on the weekend I'll, double check them all, but if I recall, they looked pretty dry when I checked last time. What made me think it was coming from the vapor collector hose was that there was some oil smeared on the underside of the air box....and I figured the only way that could have gotten there was a leak dripping higher up and carried by the wind rush up under the air box. So that's what led me to think it was one of the oil vapor collector hoses dripping, as I could see some oil smeared when looking upwards through the "v" from the FLHS with a torch? But maybe not. Its a fair chance it may well be the oil pressure sensor now I have ruled the vapor hoses out, but your talcum power idea is very simple and worth trying also.
I'll keep you posted on my findings...

Thanks John.

Cheers Paul.
 
Hi John, pulled the tank and airbox again today, finally found the problem; leaking oil pressure switch as we guessed. Interestingly the terminal plug on top of the switch was also full of oil which makes me think the leak was coming up through the spade terminal , not from the threaded connection to the block? Interestingly this part has now been superseded by MG to a different switch design? The replacement switch has a single spade on the top rather than a din plug arrangement. Also the thread is smaller than the original unit, which means you also now need an adaptor. Shouldn't be a big issue, but I preferred the din plug than an open spade. I'll have to cut the existing plug off and terminate with a spade connector and then use a bit of heat shrink over the top with some silicone sealant in it to make sure the spade connection is water resistant. Also the adaptor now means you have two faces that have to seal rather than just one. More chances of future leak in my opinion. However, I'll be sure to use a bit of Loctite and correct torque. Bit of a hassle because my local dealer only had the pressure switch in stock not the adaptor....... so have to wait till mid week to get one.

Keep you posted.

Cheers Paul.
 
Someone at Guzzi didn't pay attention to make the new part backward compatible. I'd check with the importer and have them get with the factory. That is not the way to supersede a part. Oil leaking up through the sensor is the most likely failure. Leaking at the threads doesn't happen unless improperly installed.
 
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