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Some minor issues with my Lawn boy

Posted by SkyLlama none (My Page) on
Tue, May 3, 11 at 1:43

I picked this Lawnboy up for 40$ a while ago and I knew it would need work, but everything was fine to finish off the last mowing season.

This year several things became obvious the carb, crank seals and muffler, and exhaust ports.

I got the carb all figured out in no time, I have extra parts so it cost me nothing.

The muffler had a crack in it for some reason causing it to vibrate badly, I welded it and it's good again

The exhaust posts were also in need on a cleaning, which they got.

None of that cost me anything to do however, the last thing I have to do is replace the crank seals, a job I've never done.

I know this is an F engine and I believe it's an f320 but I don't have a clue if that would be right or not.

How hard is it to replace the crank seals? The upper one looks easy by taking the flywheel off but for the lower one I'm not sure.

How much will the seals cost and how do I put them in?

Any help is appreciated.


Follow-Up Postings:

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RE: Some minor issues with my Lawn boy

What model of Lawnboy is this? To do the bottom seal, you should unbolt the engine from the deck and flop it on it's side. CAREFULLY hook the seal and pull it from it's recess in the case. DO NOT scratch the sealing area in the case. Clean the seal seating area. Clean the crank shaft with scotch-brite or light sandpaper to keep from damaging the new seal when you slide it on. Put some oil on the newly cleaned shaft and slide the seal on. Take a piece of PVC pipe of the proper diameter to fit over the crank shaft and tap the seal into place in the crank case recess.


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RE: Some minor issues with my Lawn boy

Oops, sorry. I didn't answer your price question. Seals should run about $3 to $5 each.

Here is a link that might be useful: Seals


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RE: Some minor issues with my Lawn boy

One thing that can stop this show is inability to remove the blade driver which prevents seal removal or installation. On a self-propelled, the drive pulley also has to come off which may or may not be possible in the back yard. Assuming you get both of those off, you use emery cloth strips on the crank to clean the whole thing or else the new seal will be ruined before you get it to the block. After polishing the whole exposed crankshaft, clean it with solvent to remove any grit remaining from the emery cloth. THEN you can remove the old seal, pull it off the crank and install the new one.


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