Crank Seal Case Repair

[Miller Mod Saws]

I need some knowledge guys. Short of replacing this crankcase do you guys have any ideas on a good way to seal this up. I'm all ears. Pics to follow.

 

[Miller Mod Saws]

Here's what I found when I removed the flywheel to advance the timing!

 

[Miller Mod Saws]

Here's what I got after I have cleaned it up. Was much worse but this won't seal. Not with the seal alone anyway!

 

[Miller Mod Saws]

I was hoping I I had the high spots out of it and what was left would seal. Well. That didn't happen.

 

[DSS]

Bore it oversize and sleeve it would be my first thought.

 

[Miller Mod Saws]

Bore it oversize and sleeve it would be my first thought.

My thought there is I would be splitting it so I might as well put another case on it. This is a 272xp! If thats helpful!

 

[Miller Mod Saws]

I know I could one shot fix it but not sure how well the seal would ever replace after that.

 

[Miller Mod Saws]

Originally I was gonna whip some JB weld in the low spots and let it set. May still be an option but I know someone on here has experienced this before.

 

[jmssaws]

Try Dirko

 

[stihl saws]

JB weld, sand it smooth and use sealant when you install the seal. What do you have left to lose? Worth a shot.

 

[Chainsaw Jim]

Isn't there a larger O.D. with the same I.D. seal from some other saw model? MS660? If so then boring it oversize to match will be as good as new.
What's the measurements of that seal? I have a few different saws to look at to see if there's the right match.

 

[Miller Mod Saws]

JB weld, sand it smooth and use sealant when you install the seal. What do you have left to lose? Worth a shot.

This is what I was thinking. But what sealant. I know red silicon is not the answer. Lol.

 

[stihl saws]

This is what I was thinking. But what sealant. I know red silicon is not the answer. Lol.

Yamabond, Dirko, anything gas resistant. Not red silicone.

 

[Miller Mod Saws]

Isn't there a larger O.D. with the same I.D. seal from some other saw model? MS660? If so then boring it oversize to match will be as good as new.
What's the measurements of that seal? I have a few different saws to look at to see if there's the right match.

Still splitting the cases to do this. So back to might as well just find another case half. Or I guess that's my opinion. And and then I would want new bearings yada yada. Which is a great option. But i guess if this were my saw. I would be trying to get the seal to seal. Then when the time comes to put in new bearings I would replace the case then.

 

[Miller Mod Saws]

Yamabond, Dirko, anything gas resistant. Not red silicone.

Lol. Red silicone is good for a mess that's it. I usually use motoseal. But if I try this method what sealant would be the key. O know motoseal dosnt work well on transfer covers!

 

[stihl saws]

Lol. Red silicone is good for a mess that's it. I usually use motoseal. But if I try this method what sealant would be the key. O know motoseal dosnt work well on transfer covers!

There's a bunch out there. Threebond has lots of choices. I think it's 1211 that's pretty well liked.

 

[jmssaws]

Dirko is the best sealor I've used.

 

[Four Paws]

I assume this is a customer saw.

Ask the customer what he wants and if his budget and schedule allow for replacing the case half, or dictates slopping some motoseal around the crank seal.

 

[1990Husky262]

i have used yamabond 4 in similar situations

 

[Al Smith]

Red Loctite would probably get it .They also make some stuff called Loctite "quick metal " press fit .I used it to seat a spun bearing in a Stihl 048 perhaps ten years s ago and it's still holding .