MY 88 240dl has been leaking oil and it has gotten worse and worse over the last month. I cleaned the flame trap and then cleaned engine. A few days later I noticed that the leak was coming from the harmonic balancer area. I am thinking that this could be the crank shaft oil seal as there is no oil on any other area of the engine. I have done a few timing belt changes on the b230f engines even on this 88. Can someone give me a rundown of changing this seal once I have removed the timing belt. I hear that the lip of the seal folds under and I want to get it right the first time. Let me know your techniques and tricks. Does the housing that holds the seal around the crankshaft just unbolt and remove from the engine? I probably need to replace the gasket behind this while I am at it.