Home › Forum › Ask A Member › Help on 1996-2000 OMC 9.9/15 HP FOUR Stroke › Re: Help on 1996-2000 OMC 9.9/15 HP FOUR Stroke
OK, well it looks like the lower seal is pressed into the block halves:
http://www.marineengine.com/parts/johns … Crankshaft
I don’t see any housings that house the seal, it appears to be held between the block halves.
Tell us more about "significant oil starts seeping out"…. Are you running the engine on a boat, or on a flushette? Does the oil look burned/grey, or fresh? Could it possibly be gearcase lube? Is the engine smoking? Any possibility the oil filter is defective and the oil is just running down the exhaust housing?
Again, I have very limited experience with these engines. I did have a powerhead off once, and was concerned about the questionable sealing surfaces between the crankcase and oil pan. I would proceed very slowly with this project, just don’t want you to open up a can of worms. Looks like the lower seal is NLA also. You might try removing the gearcase to see if the driveshaft tube, impeller housing is covered in oil.
Perhaps you can run the engine briefly with the gearcase off/no water, maybe you might be able to pinpoint the problem looking up into the exhaust hsg with a light afterwards….
I guess I should have asked about oil level to begin with, be sure it is not overfilled. Perhaps the engine was improperly layed down causing oil to enter the cylinders. Does the oil look clean? No signs of water or contaminants?