I have a 245 1989 station wagon. I exchanged the harmonic balancer, the main shaft seal, the intermidiate saft seal, and the timing belt. I started the car, it runs great. After about 3-4 minutes the oilpressure light lites up. I turned off the engine and started again right away. The oilpressure light was off, however 1 minute later it was on again. I did the last exercise about 2 times, the light is on after about 1 minute. I substituted the light with an ohmmeter, measuring directly on the pressure switch same result. Looks like that the problem is real. I checked the seals they are okay, the oillevel in the engine is okay. The car never had this problem. What I do not understand, what is the relationship between the work what I did and the oilpressure, or it is only dumb luck. Why at first everything is working and then it quits? Could somebody tell me what is the problem? Thanks very much Gabriel, a happy owner of 4 Volvos