Just two months ago the block side seal on the oil delivery tube of the fresh 90 B230FT in my 87 745T let go. It just happened again, and I just finished fixing it today. I started out with another oil delivery tube and decided to build up the ridges which hold the seals in place. Welding, brazing, or soldering was going to make the tube hot enough to distort, so I looked for something else. I decided to build up the ridge with a product called JB Weld, a high (read slow setting) strength epoxy that bonds well to metal. I cleaned the outside of the tube with acetone and roughened up the surfaces I wanted the epoxy to bond to with the edge of a bastard file. Originally I was going to make a mold, but I used an old oil pump housing instead. I cleaned the inside of the discharge port of the oil pump housing and then coated it with a mold release agent. JB Weld will bond to metal surfaces even with some light oil present and I didn't want my oil delivery tube to become a permanent part of the oil pump housing. A thin coat of heavy grease would probably do also. I mixed up the JB Weld and coated the ridge and about 1/4 inch of the delivery tube above the ridge with the epoxy. Then I inserted it into the oil pump housing and let it set up overnight. The next morning I twisted the oil delivery tube out of the housing and went through the same process with the other end of the tube. I used a fine mill file to smooth the epoxy at the ridge where the square cross section o-ring fits. The ridge now has a square shoulder and the o-ring cannot be pushed over it with high oil pressure. The tips of the oil delivery tube are unchanged, but the tube at the ridge and past is now a precision fit in the respective bores in the block and oil pump. I started with the tube on Friday night, and did the removal and replacement today. Total time today was 2 hours and 45 minutes from start with the car sitting in the garage to driving it. With about 15 minutes for tool cleanup and put away it was about 3 hours total. Not bad for no hoist and no air tools. Hot oil pressure is now 42 psi at idle. Hot running oil pressure is 65 psi.