046 Chain brake pin

[JonCraig]

Rebuilding an 046. Just discovered this pin on which the brake handle/flag pivots.

Can anyone tell which pin it is from the IPL below?

How much of a pain is it to get this broken pin out? Any advice?

Thanks!

--JC

 

[HarleyT]

Looks like #11.
Can you put up a pic of the backside? it should drive out...

 

[JonCraig]

You're right... #11 is longer than the others, and this one looks like it would have to be longer to go all the way through the brake "flag".

Better news... found an air leak in the crankcase. I'm assuming there's no way to fix this w/out splitting the cases, right?

 

[HarleyT]

What is leaking? We just see a mound of bubbles.....

 

[JonCraig]

One of the three case screws that goes around the bottom end. The one closest to the carb. Tried coating the screw w/ motoseal, but still leaking the same. Suspect case gasket?

 

[Ozhoo]

1121 162 5205

I just experimented with driving one out from the backside. It took way more banging than I'd want to do on a good case.

 

[JonCraig]

Wonder if it could be drilled out and something similar pressed in?

1121 162 5200 (the pin beside the one in question) is on eBay. Have reached out to my "go to guy" for parts to see if he can get it. If he can't, I'll try my Stihl dealer.

Here are two pics of my air leak location. It's only leaking on the flywheel side. Clutch side is fine, but just showing the screw in question. Can't visualize where the leak is coming from... would pretty much have to be the case gasket, right?

 

[blsnelling]

1121 162 5205

I just experimented with driving one out from the backside. It took way more banging than I'd want to do on a good case.

I deleted my post since I was obviously wrong!

 

[JonCraig]

So on the air leak... it's not the case screw, it's whatever is in that recess just above the case screw. (This is on flywheel side.)

 

[Ozhoo]

So on the air leak... it's not the case screw, it's whatever is in that recess just above the case screw. (This is on flywheel side.)

There's an alignment pin in that hole, so yes, you have a case gasket failure.

 

[JonCraig]

Welp...looks like I'm a-learnin how to split cases! And replace bearings since I'll already be in that deep.

 

[JonCraig]

I'm sure I know the answer already...

Case gasket: Worth it for OEM?

Also, thin coat of motoseal on both sides?

 

[cus_deluxe]

Yep, just get an oem gasket and seal kit. Ddave has em on the bay for $30 shipped.

 

[BuckthornBonnie]

It is critical to use oem case gaskets for this series of Stihl. For some unknown reason, AM 046/460 gasket kits use this God-awful waxy paper that feels crappy and has failed in 3 saws that I know of.
Other kits (036, even a chinese 064) feel "right" and work well.

Thin coat of sealant, yep.

 

[JonCraig]

Awesome. Thank you guys.

I am slightly confuzzled about replacing the bearings, though. On the clutch side, I've been reading in another thread about using the oil pump as the stop for the bearing. I thought the bearing was recessed a bit to allow space for the seal? Does the outer edge of the clutch side seal go inside the outer race of the bearing itself?

Maybe I'm thinking too hard and need to chill out until after I split the cases and get to take a good look? But I'm a nerd, and I like to have all my ducks in a row beforehand...

 

[BuckthornBonnie]

Yep, the seal sits within the bearing. The pump positions it properly and the seal isn't recessed too far. Use the oil pump as a stop and keep it in there when centering the crank. Many ways to do this but I use heat.
Take a pic of the existing seal depth for later, it's about flush with the bearing... right?

 

[JonCraig]

Take a pic of the existing seal depth for later, it's about flush with the bearing... right?

Here's how the seal sits now. Both seals were leak-free, I just figured since I was in here, I'd be a fool not to replace them. Then found the case gasket leak. And told myself, "welp, if I'm gonna be splitting the case, I'd be a fool not to replace the bearings."

Now I'm wondering if I'd be a fool not to powder coat it, or maybe just paint? But if I paint and it starts to peel as soon as gas gets on it, I'll be thoroughly pissed...

 

[cus_deluxe]

i wouldnt bother with paint. Get it powdered if youre gonna do anything, but id just replace the stuff youre talkin about.

 

[blsnelling]

Unless you put hardened, gun sprayed paint on it, it will not last.

Yes, the oil pump is used to set the bearing depth. Seal depth has nothing to do with the bearing depth. The seal seats in the bearing, not the case.

 

[JonCraig]

How much does a powder-coat run?

I'm assuming more than worth putting into an 1128 that isn't particularly special or hold any sentimental value...