Robin EH29C oil pressure

[Godeau]

I rebuilt an engine in a 1997 EZGO with a Robin EH29C engine. I had a broken connecting rod and my assessment was lack of oil. I replaced the crankshaft, rod, piston and everything else that was damaged.. When bench testing it, I didn't have any oil pressure.. I talked to several techs and was told they didn't carry much pressure, so I put it in the cart and test drove it. At about 10 miles it broke another rod and scored the crank. I replaced the damaged parts and still have no oil pressure on the bench. The only thing that I find not right from the manual is that I have too much endplay on the balance shaft. There was not a thrust washer in there originally and there is no seal on the shaft. I don't see how that would affect the oil pressure. It isn't pumping any oil at all.. I'm using 10W30 oil and it has a new screen in it. It's not a difficult motor to understand I'm baffled.