Stihl MS 460 cylinder question

[brandonstc6]

I have gathered together enough parts to build me a ms 460. I have a good looking cylinder, but it has a tiny indention above the intake port, about 3/4 of the way up. It is about the size of a pencil lead tip. It catches my fingernail a tiny bit on one side. Here is a picture of the spot in question and a picture of the parts I've gathered, i have all of the small parts in my box of parts. Thanks in advance.

 

[brandonstc6]

I found a second mark like the one above. here is a picture of it. If i can use this cylinder, how do i prepare it for use?

 

[Ozhoo]

Ouch, pits are one thing but flakes can quickly spread. That looks like it's going to spread.

 

[astnmacgto]

That is a chrome cylinder correct? It looks like flakes, in that case it can south fast

 

[backwoodsman42]

Kinda looks like plating coming off. It doesn't look like any piece of bearing or excessive wear.
I'm always leary of anything above the exhaust port.

 

[brandonstc6]

I have another cylinder that has the top three fins broke off. Ill pull that cylinder and see if its good.

 

[Andyshine77]

If the coating on is coming off in the second picture, no I wouldn't use the cylinder, if it's just an indentation like the first pic, it won't cause a problem. Just make sure it's smooth first.

 

[brandonstc6]

Thanks for the help guys. I took another cylinder off a parts saw and it is much better, it just doesn't look as good on the outside.


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[Adirondackstihl]

Hit it with a diamond burr and run it.
I've fixed worse with no ill effects

 

[brandonstc6]

Guys I have another question. I picked up a pair of ms460s at a scrap yard for $15. One has bad bearings and a good cylinder and the other had a scored piston and the wrong gas tank(044). I needed a better case for the above project, so I took apart the saw with a scored piston and I found this.

What cause this? Air leak or straight gas?



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[brandonstc6]

The crank seems good, but I am going to split the case and replace the seals and bearings anyway. I am going to use the other parts I have to complete the saw. And then replace the bearings in the other saw.
I'm just curious as to what could have happened
Thanks


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[astnmacgto]

Dirty air filter or ingesting crud out of the tank for a long time

 

[brandonstc6]

That's a possibility, I'm kinda puzzled because I couldn't find the missing chunk of piston. Also the crown is also melted on the edge


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[astnmacgto]

Is that the intake side?

 

[brandonstc6]

It's the exhaust side. Here is the intake side.

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[astnmacgto]

Something tells me that whatever foreign material it was ingesting was collecting on the edge of the piston creating a hot spot when running causes the seizure and the broken portion of the piston. Is this also the one with bad bearings?

 

[brandonstc6]

It is the one with good bearings.


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[brandonstc6]

That theory is likely.


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[astnmacgto]

I can't believe somebody would scrap a 460

 

[brandonstc6]

I can't believe somebody would scrap a 460

I got a running ms440 off the scrap yard once. The handle part of the gas tank was busted. It had a like new 32" oem bar and chain. I also got a mint, perfect running husqvarna 262 off the scrap yard once too.


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