Ideas on source of oil leak?
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Hooked
2016 GTS 300
Joined: 09 Nov 2016
Posts: 107
Location: New Zealand
Sat Nov 23, 2019 8:56 pm quote
My 2015 Vespa GTS 300 is dripping several drops of engine oil a day from under the rear left extremity of the floor, just where the small trim panel joins it. The curved arrow in the photo points to a drop of oil where it drips from.

I've had a look around with a torch, and I can't see any stray oil at all, or even anything directly above this where it might be coming from. I would appreciate any ideas please.

Cheers,
Jim.

Vespa Oil Drip.jpg

Hooked
GTS 300ie Touring
Joined: 03 Jun 2018
Posts: 348
Location: Limassol, Cyprus
Sun Nov 24, 2019 3:34 am quote
Directly above there is the engine oil breather pipe that comes out of the top of the engine and goes to the air filter box. Could you have a lose rubber hose that leads from the breather valve?
Addicted
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 757
Location: Toronto
Sun Nov 24, 2019 3:43 am quote
Is it possible it's coolant? There's a hose in the floor, and it's known to sometimes leak at the clamp.
Ossessionato
2016 Vespa GTS 300 i.e. ABS, 2010 Vespa GTS 300 ie Super (sold) & 2003 Honda Shadow VT750 ACE (sold) & 2006 Vespa LX150 (sold)
Joined: 18 Oct 2009
Posts: 3063
Location: Toronto (formerly Montreal)
Sun Nov 24, 2019 4:54 am quote
berto wrote:
Is it possible it's coolant? There's a hose in the floor, and it's known to sometimes leak at the clamp.
Thatís what I was thinking it might be. My floor coolant leak was more forward though.

D8FDAD85-77BE-404F-A2B3-C41A0ADD604C.jpeg

Hooked
2016 GTS 300
Joined: 09 Nov 2016
Posts: 107
Location: New Zealand
Sun Nov 24, 2019 12:15 pm quote
Touring300: I've checked the breather hose, no leaks there.
berto and David: I put some newspaper under it last night, and there is a hint of pink colour, so I think you're onto it! It feels like oil between my fingers, but perhaps it concentrates (by evaporation) before it comes out, and feels slippery because of that. Looks like I have to take the floor off again - a real PITA job!
Thank-you all for your suggestions. Don't know why I didn't think of white paper under it before.

Cheers, Jim.
Ossessionato
2016 Vespa GTS 300 i.e. ABS, 2010 Vespa GTS 300 ie Super (sold) & 2003 Honda Shadow VT750 ACE (sold) & 2006 Vespa LX150 (sold)
Joined: 18 Oct 2009
Posts: 3063
Location: Toronto (formerly Montreal)
Sun Nov 24, 2019 2:24 pm quote
I should have posted a shot of the hose joint that sometimes leaks.

Here tíis, better late than never

Joint is circled.

C7D319F4-7962-415E-9F1B-B099B6CBD348.jpeg

eeee-bip
Benelli TNT 125/Kymco AK550 I don't care. You can quote me.
Joined: 15 Apr 2008
Posts: 17377
Location: South East Great England of Britishland
Sun Nov 24, 2019 2:44 pm quote
Fluid
Pink, Blue or Green I'm going with coolant.

It will sometimes will drip from behind the leg shield into the foot plate.

Bill x
Hooked
2016 GTS 300
Joined: 09 Nov 2016
Posts: 107
Location: New Zealand
Sun Nov 24, 2019 3:23 pm quote
David, thanks for that picture. There are so many joints in the system! I'll start with that one. It'll be next weekend before I can take it off the road to do the job.
Hooked
2016 GTS 300
Joined: 09 Nov 2016
Posts: 107
Location: New Zealand
Sat Nov 30, 2019 10:45 pm quote
Well, I removed all the panels and found a small leak at the joint shown in David Masse's photo above.
Funny thing is that it had a normal (re-usable) hose-clamp on the front part of the joint, but a single-use clamp (which I think is the one that was leaking) on the rear hose. Why on earth didn't they put a "proper" clamp on the rear connection as well? It seems to have been a known problem for years!
Anyway, here's hoping I have fixed it. I'll go for a ride tomorrow and get it pressurised.
Thanks for comments and suggestions!
Cheers, Jim.
Hooked
GTS 300ie Touring
Joined: 03 Jun 2018
Posts: 348
Location: Limassol, Cyprus
Sun Dec 01, 2019 2:02 am quote
Glad you were able to find the source of the leak and remedy it Jim. It looks to me like the joint has leaked before (with the original clamp) and a mechanic has simply just replaced the clamp where the hose was leaking. I am sure if the original owner had changed it, they would have also taken the time to change the other one at the same time. Thanks for letting us know of the outcome.
Hooked
2016 GTS 300
Joined: 09 Nov 2016
Posts: 107
Location: New Zealand
Sun Dec 01, 2019 11:46 am quote
I bought it brand new, so I think that's how Piaggio did it in the factory!
Molto Verboso
Vespa GTS 250ie
Joined: 02 Jun 2015
Posts: 1227
Location: San Francisco Bay Area
Tue Dec 03, 2019 10:26 am quote
The factory clamps are notorious for coming loose.
Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: 11 Jun 2011
Posts: 2248
Location: Starfleet Command, South Eastern HQ, UK
Wed Dec 04, 2019 7:02 am quote
Yes, the factory fits one screw worm clamp to the front section of the pipe, and a one time use clamp to the rear section. Madness! It's always the one time use clamps that leak.
Hooked
2016 GTS 300
Joined: 09 Nov 2016
Posts: 107
Location: New Zealand
Wed Dec 04, 2019 11:55 am quote
Went for a ride yesterday to get it pressurised to normal running temperature. No leaks yet - yay! I think it's fixed. You never quite know how tight you dare to make the hose-clamp without risking a split in the rubber as it ages.

Stromrider, are you aware of any other joints that are notorious for leaking? I'm thinking that next time I have the panels off (which I hope will be a long time in the future), it might be worth replacing those ones. I suppose one could replace all 18 (?) of them, but it would be quite a job.

Cheers, Jim.
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