OP
Sat, 16 Mar 2019 03:12:02 +0000

Hooked
GTS 250
Joined: Sat, 26 Apr 2008 17:42:40 +0000
Posts: 346
Location: California
 
Hooked
GTS 250
Joined: Sat, 26 Apr 2008 17:42:40 +0000
Posts: 346
Location: California
Sat, 16 Mar 2019 03:12:02 +0000 quote
After searching all over this forum & the internet, I was unable to find the correct Piaggio water pump seal drift that would allow setting the seal correctly.
A custom machined (not available) drift can be seen here https://www.youtube.com/watch?v=RYj6gr33yaQ&t=1876s

For those who don't know, the seal has a tension spring and needs to have the outer half and inner half pressed in place at the same time but at different depths. You can't just drive the outer half only without destroying it. The spring needs to be able to compress in the drift without bottoming out. The seal is very fragile, and I destroyed one before I came up with the method below.
I found a 1 1/16 socket worked good for the outer seal. Two washers & a plumbing fitting are used to take up the height difference for the inner seal. Any parts can work, as long as the heights & diameters are somewhat correct.
The assembled makeshift drift.
The seal, sitting in the drift ready to be pressed into the waterpump housing. The spring can compress, but not bottom out (roughly 1/16").
Mon, 18 Mar 2019 17:34:50 +0000

Molto Verboso
Vespa GTS 250ie
Joined: Wed, 03 Jun 2015 01:51:25 +0000
Posts: 1229
Location: San Francisco Bay Area
 
Molto Verboso
Vespa GTS 250ie
Joined: Wed, 03 Jun 2015 01:51:25 +0000
Posts: 1229
Location: San Francisco Bay Area
Mon, 18 Mar 2019 17:34:50 +0000 quote
Nice, lateral thinking there!
⬆️    About 6w elapsed between posts    ⬇️
Mon, 29 Apr 2019 05:17:58 +0000

Hooked
GTS 300, BV250
Joined: Fri, 29 Jun 2018 20:01:57 +0000
Posts: 166
Location: Orange County, CA
 
Hooked
GTS 300, BV250
Joined: Fri, 29 Jun 2018 20:01:57 +0000
Posts: 166
Location: Orange County, CA
Mon, 29 Apr 2019 05:17:58 +0000 quote
I've been holding off doing this because of this 'special' tool as well...

I saw your solution and went looking for a suitable socket. Couldn't find one but I was able to scrounge around the garage and come up with another alternative, this one cast in plastic.

Behold the PVC Water Pump Seal Tool (PVCWPST)!

I fashioned it from a 3/4" union with a bit of 3/4" Sch 40 PVC jammed in one end to approximate the correct spring plunge depth. Another, longer piece got stuck into the other side to serve as a handle. It took a few attempts at cutting the PVC to get it to where the depth seemed about right. A few gentle taps was enough to get it most of the way in. I had to spin it around a few times as the cut wasn't quite square.

I won't know if I destroyed the seal until I get some coolant and fill it up but it looks like it seated properly in the cover. There's resistance to turning the shaft but nothing feels broken.
⬆️    About 4y elapsed between posts    ⬇️
Sun, 30 Apr 2023 11:37:13 +0000

Lurker
vespa gts super
Joined: Sun, 21 Nov 2021 17:38:03 +0000
Posts: 2
Location: spain
 
Lurker
vespa gts super
Joined: Sun, 21 Nov 2021 17:38:03 +0000
Posts: 2
Location: spain
Sun, 30 Apr 2023 11:37:13 +0000 quote
Hello partners


It is just what I was looking for to change the seal of the water pump of my gilera nexus 500


The price of the assembly and disassembly tool is exorbitant, more than 200 euros!

I have managed to remove the old seal, with a lot of patience. Now it's only fatal to make the assembly tool to put the new seal.


Thank you!
  DoubleGood Design  

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