Thanks to all that have replied previously.

I have an oil spray on the starboard side of the bilge down low, near the starter gear/flywheel area.

I'm going to pull the starter and water lines tomorrow. Good thing I'm a small guy, I might just fit in the little space to work on this. I checked the dip stick tube...no leak. checked the oil pan...no leak. I think its the crankshaft main seal.

The engine is a 1999 Block recently rebuilt (10 hours)
The engine builder is Proroc in New Jersey. They haven't returned my calls. I was informed that they were a very reputable builder. I'm not going to bash them, might not be their fault. But I wish they would at least return a phone call and assist me on a 10 HR engine that they built.

I'm decent mechanic, but never worked on boats too much. Do I need to pull the drive to remove the engine if it gets that far?

Can I possibly drop the pan in the boat and replace the seal?

Again, any help is greatly appreciated. By the way, you guys are pretty sharp, your info on many of the posts is very accurate!!!

Thank You

If you suspect that the rear main is leaking, you have to pull the motor to repair it. The drive would have to come off as well. The rear main on that motor is a one piece seal that gets put on from the back of the crank. You would also have to remove the coupler and flywheel.

After you get the flywheel off, look carefully at these three areas before you start on the rear main. This is all Mark 4 information so I dont know if it applies to your engine or not. There is a pressed plug at the end of the cam shaft and there are 2 pipe plugs at the end of lifter oil galleys. Check these for leaks and make sure that one of the plugs doesnt have a tiny hole drilled in the middle of it. Those are used on the front end to oil the timing chain but can end up anywhere if someone wasnt paying attention (I know that one from experience). Then, if you have a cast oil pan, check to make sure the 2 unused drilled holes on each side of the rear main used for the stamped oil pans are plugged. ( I had that experience this year). Good Luck
Tom

Hey Pantera,

Keep calling Ralph, he needs to make good on this one. If its a rear main seal they can have the motor out, fix it, put it back in and test run it in one day.

If not, go down to Kurts, he'll fix it. You'll probably start a war, but hey thats the name of the game.

I don't think you need to get your hands dirty at all. You paid good money for the motor, and they should fix it at no charge.