024 crank bearings

[stihlcuttin8989]

So I’m rebuilding this 024 AVS, and I got the bearings in but now I’m worried I may have done it backwards. Anyone that knows or that can help I would greatly appreciate it!

 

[drf256]

You did it backwards.

The PTO side bearing is installed with the extended lip outward and the plastic bearing retainer inside the case next to the crank. The extended lip is there to retain the seal, and the bearing gets its lubrication from the retained oil from the fuel mix in the case.

In addition, you need to install the oil pump to set the depth of the PTO bearing. I drop a room temp bearing into a hot case and it will bottom out on the oil pump. For the 1121 series, I use an old metal fixed output oil pump for this. The newer nylon 026 pumps can melt. AM 026 adjustable pumps are good to set depth as well.

The flywheel side position doesn’t really matter.

The issue you have is that it’s easy to ruin the installed bearing plastic with heat. Heat the case carefully and tap it out with a socket from the INSIDE OUT in your case. You don’t want to get that bearing retainer hot. If I am redoing a saw with new bearings (ie swapping a 12mm crank into a NIB 10mm 044) I actually go as far as removing the plastic cage and reassembling the bearing after it’s removed and cleaned.

 

[redline4]

Hers a build I did on a MS460.
Different model obviously but bearing install will be the same. There should be pics showing that.

Lets make a Stihl MS460

There may already be a thread, but I didn't see one on a quick search. Either way, I'm putting one together so thought I would do a build thread. Expect delays while I wait for parts, time or backtrack because I got ahead of myself. Also, there's multiple ways of doing it and some better than...

opeforum.com

 

[stihlcuttin8989]

You did it backwards.

The PTO side bearing is installed with the extended lip outward and the plastic bearing retainer inside the case next to the crank. The extended lip is there to retain the seal, and the bearing gets its lubrication from the retained oil from the fuel mix in the case.

In addition, you need to install the oil pump to set the depth of the PTO bearing. I drop a room temp bearing into a hot case and it will bottom out on the oil pump. For the 1121 series, I use an old metal fixed output oil pump for this. The newer nylon 026 pumps can melt. AM 026 adjustable pumps are good to set depth as well.

The flywheel side position doesn’t really matter.

The issue you have is that it’s easy to ruin the installed bearing plastic with heat. Heat the case carefully and tap it out with a socket from the INSIDE OUT in your case. You don’t want to get that bearing retainer hot. If I am redoing a saw with new bearings (ie swapping a 12mm crank into a NIB 10mm 044) I actually go as far as removing the plastic cage and reassembling the bearing after it’s removed and cleaned.

So I should heat the case attach the oil pump and drop the bearing in?

 

[drf256]

So I should heat the case attach the oil pump and drop the bearing in?

Yep

 

[stihlcuttin8989]

Well is the other side in correctly

 

[jacob j.]

Well is the other side in correctly

Pop that shield out before you put the crank in.

 

[stihlcuttin8989]

Pop that shield out before you put the crank in.

how? never mind got it!