guru Looking at the top of the oil pump drive and it's a bit different to the top of the earlier b20 pump. Not sure but it's normal for the 740 or not. Pics attached although a bit hard to show in photo looks like wear on the edge. It's different on each edge. The b20 pumps look round
guru ramrod;c-145681 wroteTotally normal Thanks, the B20 ones dont have those "wear" marks on them and look rounder, from the top.
Major Ledfoot There's an oil pump reinforcing ring available from iPD for about 9 USD. It was intended originally for B20s, but AFAIK the Turbobricks lads have also used them on B230s. https://www.ipdusa.com/products/6258/100832-oil-pump-reinforcing-ring iPD also says it's also wise to check the play in the shaft to see if the brass bush in the block has worn. If it has more than 25 thou of excess clearance, the bushing in the block ought to be replaced.