Lower seal missing 10515?

[LB8210]

Best as I can tell, the the seal is missing. If I were installing a new seal I would remove all traces of oil on the walls of the bore and install the new seal dry on the side of the seal that contacts the bore wall. And prelube the seal lip with either grease or two cycle oil. Install flush with the top of the bore using a seal driver or a piece of PVC thick wall tubing to support the top of the seal going in.

 

[Phototone]

I made a seal-seater from a piece of plastic water pipe cut longer than the length of the exposed crankcase. Put the seal on, slide pipe over crankshaft and tap pipe to get seal seated to correct depth.

 

[reynoldston]

The point as that a four stroke runs in a bath of its own dirt and particulates and is far more likely to have bearing and bushing wear causing crankshaft play, and therefore seal damage.
A two cycle runs in fresh oil and is less likely to have bearing or bushing damage, and therefore less likely to have seal damage caused by crankshaft play. Since a two cycle does not have a crankcase full of oil and IS subject to rapid pulsations it is more likely to fail for other reasons, especially dry rot if it has sat for a few years.
Again...they are diffrent animals

Yes seeing I have repaired both style engines many times I well know the different in the two engines. So when you go the dealer that sells seals and bearings just what determines if it go's in a 2 cycle engine or a 4 cycle engine. I have personally never seen a different. I have always bought seals and bearings by size, style, and number not what it go's in.

 

[unclelee]

Yes seeing I have repaired both style engines many times I well know the different in the two engines. So when you go the dealer that sells seals and bearings just what determines if it go's in a 2 cycle engine or a 4 cycle engine. I have personally never seen a different. I have always bought seals and bearings by size, style, and number not what it go's in.

Again, the original conversation was...if you replace the seals without rebuilding the engine, you will only have to do it again next year.
This was in reference to a sloppy four stroke, and normally doesn't apply to a two cycle Lawnboy engine as the seals can be replaced without an engine rebuild and still get years if not decades of use from it.
But as it seems you have an incessant need to be right....so yep all seals are the same...be they oil seals, compression seals, dust seals, or what ever....they are all the same.
I stand corrected by your vast knowledge.
That being said....my appologies to everyone else...I will not post here again.
Lee

 

[reynoldston]

From the looks of what I can see of the pictures the seal looks missing. There has to be a reason for this. It can't be that big of a job to disassemble the engine to find the reason. Its very hard to know what is what with just a picture. If you don't want a OH it sure has to be worth a few gaskets to look inside the engine.

 

[mulligan]

LB When you say to install the new seal "flush with the top of the bore" are you saying to just drive it in till its flush or to drive it all the way in to what I believe is the bearing

 

[LB8210]

LB When you say to install the new seal "flush with the top of the bore" are you saying to just drive it in till its flush or to drive it all the way in to what I believe is the bearing

Drive it in till it's flush, with the opening edge.