Jeff and 20mercman are right about that o ring. It must’ve been absent when I first had it apart back when. I will order a replacement and put it back together and use some gel seal on the halves this time . I anticipate a struggle getting the pistons back in. Seems like it’ll be tricky with them still attached to the crank .
Close inspection of this little check valve welch plug shows it to be loose too. Tap it in and a little sealer of some sort ❓
