Stihl O28 AV Super bar and chain

[Johnwi]

1. Hi all, I’m having a little difficulty matching up my fathers bar and chain. I need to replace his bar on his Stihl O28 AV Super. Something is not adding up and I’m wondering if he was running 3/8” chain on the .325 bar? It’s a Stihl 16”bar model #3003-000-6813. From what I’ve measured it appears he has a 3/8”-0.50-67 chain on it. Not for sure on the gauge as I have nothing g to measure it with but definitely 67 drive links long and I measured the distance between the links and come up with 11/16” which I divided x 2 and come up with 3/8” for pitch. If I remember correctly this saw can run 3/8” or .325 chain. It has a 7 tooth sprocket. I think the saw may be from 1985. There serial number is 213209857. Looks like he has the original bar on the saw. I’m not coming up with a lot of options when searching for bars at 3/8 x .505 x 67 I find more options for size .325 x .o63 x 67. I’m guesssing I’m calculating something wrong and someone will have an easy answer.
   
   Thanks for the help,
   John
   
   Jan 13, 2019 at 9:51 AM
   
   

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[HarleyT]

Put up some pics!!

 

[HarleyT]

If you can read the part number on the bar, the other info should be legible.
Also, the chain will have numbers/markings that will tell us something as well.
And I am guessing that the sprocket is bad, but that is just a guess.

 

[Johnwi]

I can only see 6 on the chain links. Pretty hard to see even with my glasses on. The owners manual stated to replace the chain sprocket with every 2nd Oilomatic chain. The only numbers on the bar are:
11.83
3003-000-6318

 

[HarleyT]

Well, the "6" on Stihl chains means that it is 1.6 gauge, or .063.
So it is most likely a .325, chain in .063 gauge.
Why do you feel that you need a new bar?

 

[HarleyT]

Just google that Stihl part number.

 

[Wood Doctor]

The bar and sprocket together control the size of the chain you should use. The #3003-000-6813 bar means that you should use .325" pitch chain with an .063" gauge. If he was using .050" gauge chain with this bar, it was too narrow.

The .o63" gauge chain loops with 0.325" pitch should have 67 drive links with this 16" bar. I generally uses an 18" bar with this saw and a #3003-008-6817 bar. I recommend that you stick with .325" pitch chain loops. That is what I use.

 

[Johnwi]

The bar and sprocket together control the size of the chain you should use. The #3003-000-6813 bar means that you should use .325" pitch chain with an .063" gauge. If he was using .050" gauge chain with this bar, it was too narrow.

The .o63" gauge chain loops with 0.325" pitch should have 67 drive links with this 16" bar. I generally uses an 18" bar with this saw and a #3003-008-6817 bar. I recommend that you stick with .325" pitch chain loops. That is what I use.

Thank you all for your assistance

 

[HarleyT]

Here. The 028 info is on page #54.