TOPIC:

lets see what you will get as 'equivalent'
I suppose it will be such a cheap chinese sealing which you can at ebay, alibaba ....
Be carefull it might be 2 mm longer as theoriginal one.
2 Burgmann engineers have warned me to use them like they are.
They recomened to take away at least 1mm from the pumps case to have more room.
Otherwise preload on teh spring amight be to high.
Thats what i have done on 2 pumps i have 'refurbished' Unfortunately both have not run any kilometer since then
Therefore i have decided to use the new, shorter ones.
All i found in teh internet have been those older, longer sealings.
Sometimes with the same labeling as the Burgmanns
But very cheap.

The shaft of your PeMoPa pump looks, at least for me, like it has tumbeled around for a time.
So maybe it has primarly been a problem with the bearing.
Are those bearings marked C3?
All pumps i have opened had C3 bearing play.
That means that play is slightly bigger than normal.
Common for bearings that are used on higher temperatures.
Beside this, those bearings may have another lubricant.
But i don't know about this.
Usually the temperature is not that high to make C3 bearings needfull.
C3 is more expensive than bearings with normal play.
So why shouls Luigi use them?
Which was the bad bearing? Closer to the hot pump chamber?
If yes, that might be a sign.
Usually one of 2 bearings is not fixed. But mostly the seat on the outside is floating.
Heating up the arrangement with 2 fixed bearings may end up in high axial loads which will kill the bearings.
When the sealings arrive i will open another pump to check if Luigi has done this or not
If you have troubble to get hands on a sealing, you know where to find me

ciao Joachim

Hi Mike
Great well done you.
That's the first challenge confronted.
Sorry to repeat myself, But when you press it apart, you must have a really snug fit over the Impeller end/side to fully support the body of the pump, and easy does it.
Use a large Ball bearing to initially press on the end of the shaft from the pulley side.

Please share the details of the seal.
I have been using this Seal from South Coast Seal UK
Mechanical Seal
Part No SBS/012LSS/Can11
Size 12mm Job No 12372
45 Ashton Road Waterloovile UK
PO7 7XJ
Tel 02392 257766
This email address is being protected from spambots. You need JavaScript enabled to view it.
Not sure if this is the Long one, or the Short one etc, but it appears to fit and work, although have not done too many miles on it.

Good Luck, Just be gentle

Pete

Hi Joachim....and sorry for hijacking this thread a bit.

Yes the bearings are FAG and are C3. I looked up tables for coefficient of expansion for steel, stainless 304 etc and given that the temperature only goes to 100*c or so, the amount of expansion of the length and diameter of the shaft is very small.
Perhaps they think its better to have clearance.....?

Even if pemopa made the shaft diameter smaller to allow for expansion due to heat, in my opinion
at 11.94 mm, it is too small. The bearings seem fine, it is only the shaft that has worn.....and its the inner bearing which is more loose, and has spun on the shaft more.
I do understand that C3 bearing will feel loose even in the hand, until it warms up.

11.94 is a lot smaller than I made mine at 11.98

Sorry my mistake......the shaft where its unworn is 11.98.

Where the bearings have been spinning its 11.97

The part worn by the inner seal is 11.94

The groove worm by the outer lip is 11.91. Its actually deeper, but the caliper jaws can't reach to the bottom

What are the numbers for the bearings in the pump?

Mike