Corrosion Damage to Crank Main Seal Surface on 140/3.0. Solution??

[cheburashka]

I've just pulled the split rear seal from the crank. There was a black stripe around the bearing surface that wouldn't clean off. Turns out it's minor corrosion damage to the surface. Not too deep. Is that something that could be carefully taken off by stropping it with fine emery cloth, or do I need to pull the crank and have a machine shop work on it? Or even worse, would that require a new crank?

Is there such a thing as an oversized seal that can be used if the surface has been machined down?

 

[cheburashka]

Re: Corrosion Damage to Crank Main Seal Surface on 140/3.0. Solution??

I've been doing some checking around and it appears that the only thing that could take care of this is a "speedi-sleeve," and I don't think that will even work because of the flange on the back side of the crank. I don't imagine anyone makes a split speedi-sleeve. I'm hoping for a miracle, but I'm pretty well resigned to having to buy a new crank.

 

[PiratePast40]

Re: Corrosion Damage to Crank Main Seal Surface on 140/3.0. Solution??

If you're not planning on taking the crank out for anything else, why not just take the motor to a qualified shop and have them give you an opinion? I don't think anyone can tell you anything worthwhile without actually seeing it.

 

[cheburashka]

Re: Corrosion Damage to Crank Main Seal Surface on 140/3.0. Solution??

If you're not planning on taking the crank out for anything else, why not just take the motor to a qualified shop and have them give you an opinion? I don't think anyone can tell you anything worthwhile without actually seeing it.

Taking the whole thing into a shop isn't an option. The whole long block is up on a hoist right now with the pan off and taking off everything I'd need to remove to be able to safely transport it would be less work than actually pulling the crank.

I thought maybe someone else had been through a similar situation and could provide some feedback on what I'm going to need to do. I could post pictures of it, but there's no way you can gauge the extent of the damage from just looking at pictures.