Hello to all, who was willing to help me....
Everything is now ok.
How it comes:
My mechaniks detached the pump, then brought it to the machineshop in tagbilaran.
After 1 hour the call:"pump is now succesfull in pieces". After, without order, my guy went to a small shop with 12 sqm, where we found already the oilfilter befor. and....the salesguy went to the back, and got all the spareparts for our GM-punp in his hands.
Now, the pump is installed and ok!
It seems, that during the last decades, there was some chevys also on our island bohol. Now, the salesguy was happy, my mech also, and especially me and my wife.
Anyway, many thanks to all you guys! It's a good feeling, in matters like this, not to be alona.
have a nice evening
hanspeter and thata