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Hose and such

Phang

Phang

Cruisin' Guzzisti
GT Contributor
Joined
Jun 16, 2009
Messages
388
Location
Singapore
I have this open ended hose dangling at the left throttle body area, is it normal?

PDSCN6544.jpg


While cleaning my bike for the very first time on Sunday, I found a black rubber hose wedged between the right frame tube and the battery, possibly pinching it. It looks like a tank vent hose to me. I have corrected it after removing the battery from its tray and remounted it correctly.

After my first longish ride to run in the engine (~150km), the bike dribbled a few drops of oil on the floor from 1 of the 4 hoses near to the rear brake lever when I parked the bike. The consistency of the oil on the floor was similar to engine oil, it has a whiff of gasoline smell as well.

Without pulling the tank and panels, armed with a parts manual and torch light/flash light. I traced the routing of the 4 hoses as best as I could, it appeared the 2 capped transparent hoses are from the air box, one of the black rubber hose from the battery tray drainage and the unknown black rubber hose dripping oil was routed to the valley of the jugs.

Logically, I thought the oil was from the blow-by system but the Guzzi parts diagram does show a drainage hose. No, my bike does not has a charcoal canister fitted.

blow-bysystem.jpg
 
I think you'll find it is the end of the gearbox breather. Part # 16 in this pic. Its usually routed up near the airbox somewhere and all it has to do is allow air in or out of the box as it warms and cools. Unlike the engine there is nothing 'Blowing-by' into the gearbox so it won't pressurise per-se.


GU08800_52.gif


The hoses that hang out the bottom? One is airbox drain and should be plugged. If it isn't? then it would be fine to do so. Check your engine oil level though and make sure it isn't over-filled. Try filling to 1cm below the 'Full' mark with the dipstick resting on the threads and the bike upright. The other pipe is from the battery tray. It shouldn't be leaking anything. If it is there is a chance the battery wasn't put into service properly. It is VERY important with these batteries that when the acid is added they sit for at LEAST two hours, prefferably overnight, to allow the acid to be absorbed into the mats. Otherwise they just puke it out when the bike starts charging and the battery's life is compromised, (Along with your paintwork!!!)

Pete
 
Spot on Pete!

Upon a close look under the bright sunlight with the rubber battery tray out of the way, the open ended hose on top of the LHS throttle body is indeed a breather hose from the gearbox.

Now, back to the dripping hose. It is actually the end of the tank vent hose. 2 hoses from each side of the tank terminated to a PVC 3 way Tee fitting on the right side of the bike and the third hose (part# A in the pic) from the Tee fitting is the one that is dripping.

venthose.jpg


I have checked the engine oil level after the first ride, bike on service stand, dipstick resting on the threads, oil level is about ¾ of the scale if you take low = 0, high = 100.

The battery was fitted by the dealer during the PDI, it looked fine when I removed it from the bike yesterday, no leakage of electrolyte. I hook it up to the battery charger to up the juice though.

I just came back from a short ride (120km), we shall see if I got fluid from the same hose again. Still couldn’t figure it out why I will get oily fluid from this hose :?:
 
I have had fuel dripping out of the vent hose when I've filled the tank to the brim & the engine's hot. The heat makes the fuel expand and I guess thats why there are vent hoses.
 
Hi Will, I filled her up to the brim today after the ride, 14.2L to be exact.

I just checked the bike at the car park, the floor is clean, no fluid dripping from the vent hose this time.
 
The pinched vent hose that I have discovered and corrected later on may be the cause of the problem.

Here’s my theory :idea:

The battery pinched the vent hose enough to hold some fluid in it. When the bike is parked after a long ride, the heat radiating from the engine raise the pressure in the tank and pushes the fluid past the pinched section.
 
Phang said:
The battery pinched the vent hose enough to hold some fluid in it. When the bike is parked after a long ride, the heat radiating from the engine raise the pressure in the tank and pushes the fluid past the pinched section.
Click to expand...

Definitely! I have had exactly the same problem and the pressure pushed the vent hose off the tank.

Phang said:
I filled her up to the brim today after the ride, 14.2L to be exact.

I just checked the bike at the car park, the floor is clean, no fluid dripping from the vent hose this time.
Click to expand...

If I sit on the bike & fill to the brim with a hot engine it takes about 3 minutes for the fuel to start dripping out of the vent hose. But it doesn't happen if I fill up with the bike on the side stand. Yeah, the solution is obvious: I don't fill too full...... or don't hang about for 3 minutes waiting for my mates to get ready ("Oh, are we going? I'll just go for a piss and then put my helmet on.....and has anyone seen my keys? OK, panic over, they're in the ignition" etc etc).
 
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