“Check expansion tank cap efficiency”
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Member
Mp3 500 2010
Joined: 07 Jul 2020
Posts: 5

Tue Jul 07, 2020 11:05 am quote
I’m checking parts of my cooling system after a leak to be sure everything is good and right, but apparently af1 and scooter west, and the web, can’t tell me how to check my cap, the manual states it should be at .9 bar and it should allow air inlet during the cooling step. So please someone tell me how? It’s a cheep part but I hate to replace something because I can’t test it

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Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8597
Location: Ashburn, Va. Home to the Internet
Tue Jul 07, 2020 11:11 am quote
You use a coolant reservoir cap pressure tester.
Not sure you are going to find one that has an adapter for the Vespa/Piaggio cap though.
Member
Mp3 500 2010
Joined: 07 Jul 2020
Posts: 5

Tue Jul 07, 2020 11:32 am quote
WEB-Tech wrote:
You use a coolant reservoir cap pressure tester.
Not sure you are going to find one that has an adapter for the Vespa/Piaggio cap though.
Thank you! I’d stark looking for one but I don’t have the slightest idea where to start
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38718
Location: Pleasant Hill, CA
Tue Jul 07, 2020 11:45 am quote
Have you got excess pressure? You'd know this if coolant started steaming out of the cap (yes, it'd become steam as soon as it dropped in pressure on exit).

No steam - you've not got excess pressure, your cap is fine.

If there's a leak, just check all hose connections. If they're OK, it can be the expansion tank itself that leaks from a split seam. If that's OK, check for white smoke when you first start the engine - if there's excess (not just the normal mist from overnight condensation) then you may have a split in the head or head gasket.
Member
Mp3 500 2010
Joined: 07 Jul 2020
Posts: 5

Tue Jul 07, 2020 11:52 am quote
Hayyyy thank you Jimc that’s super helpful, I guess my cap is fine, I only had my water pump cover o-ring go out so I’m replacing it(it looked a little shabby) I do know how I’ll likely need a new water pump I just thought I’d try the new o-ring, say Jimc do you know if the o-ring needs any sealant? I know that manual says no, but when I opened my bike up the o-ring had a thin white grease feel to it, I wasn’t sure what that was about, again thanks
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38718
Location: Pleasant Hill, CA
Tue Jul 07, 2020 4:56 pm quote
No sealant needed. Be *very* gentle with the screws.
Hooked
50cc Beo, BigBeo
Joined: 30 May 2015
Posts: 234
Location: Chelyabinsk, Russia
Wed Jul 08, 2020 10:22 am quote
I've overheated my mp3 recently on a kinda offroad forest road Well, mp3 puked some coolant on a stop. I didn't have a chance to find where it is from: a hose, a hose clamp, from cap or whatever. The good part is that it remained dry on a tarmac and didn't overheat on my way back home.

And unfortunately it was not any kind of steam.
Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: 11 Jun 2011
Posts: 2854
Location: East Anglia, The power house of the UK
Thu Jul 09, 2020 12:15 am quote
Jah, make sure your coolant fan is working. You shouldn't be losing any coolant.
Hooked
50cc Beo, BigBeo
Joined: 30 May 2015
Posts: 234
Location: Chelyabinsk, Russia
Thu Jul 09, 2020 8:50 am quote
Yep, it works indeed. Even more strange thing is that temp gauge wasn't overfilled.
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 241
Location: Belgium
Thu Jul 09, 2020 3:02 pm quote
Jah wrote:
Yep, it works indeed. Even more strange thing is that temp gauge wasn't overfilled.
Just out of curiosity, how do you "overfill" a temp gauge???
Hooked
50cc Beo, BigBeo
Joined: 30 May 2015
Posts: 234
Location: Chelyabinsk, Russia
Thu Jul 09, 2020 6:58 pm quote
Just as anything else, in two steps: first you fill it up to top, and next you add one more drop.

Indeed I mean that it didn't reach its maximum reading.
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