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Post by ckbrew on Aug 21, 2022 15:04:57 GMT -5
I have a 245 manufactured about 1985, bar and chain are trashed and need replacing. There is some confusion about what pitch I should select. The manual specifies .375, the original bar says .325, and the present chain on it is a .325 but it is not the original chain. Since the bar and chain are being replaced, the only old part left is the sprocket. The only markings on the sprocket is 32 stamped in it. It is an 8 tooth sprocket.
How do I tell what I need? Does it matter? If the sprocket is designed for .325 and I put on a .375 chain will it tear itself apart, make noise? what about the other way, .375 sprocket with a .325 chain? Or does it not matter? Is there such a thing as a sprocket size for the chain?
Ty.
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Post by undee70ss on Aug 21, 2022 15:33:44 GMT -5
Yes the sprocket must match the pitch of chain.
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Post by ckbrew on Aug 21, 2022 16:16:53 GMT -5
Is there a way to measure the sprocket size? If incorrect does it lunch itself out?
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Post by Pulsar 922 on Aug 21, 2022 16:52:10 GMT -5
An 8-tooth sprocket stamped "32" is a .325 pitch. Optional sprockets for the 245 included a 7-tooth 3/8" pitch,
and a 6-tooth 37/.375"(LP) pitch. Any significant wear or damage... the sprocket should be replaced. Running a new chain
on a damaged or mismatched sprocket will cause problems.
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Post by ckbrew on Aug 21, 2022 17:07:26 GMT -5
Thank you everyone for explaining this.
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Post by Pulsar 922 on Aug 21, 2022 17:21:34 GMT -5
Thank you everyone for explaining this. Thank you for the appreciation! If you need a new .325" sprocket, I see a NOS one available for a very reasonable 9.99. |
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Post by ckbrew on Aug 21, 2022 17:44:36 GMT -5
Care to share? The current one I would call dimpled on the teeth, not bad for 37 years old. Does this count as needing to be replaced? The bar I got was NOS. |
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Post by Pulsar 922 on Aug 21, 2022 18:01:21 GMT -5
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Post by ckbrew on Aug 21, 2022 18:20:28 GMT -5
Regular bearing grease for cars? What should be looked for during inspection?
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Post by undee70ss on Aug 22, 2022 0:16:17 GMT -5
Regular bearing grease for cars? What should be looked for during inspection? I prefer high temp wheel bearing grease. Clutches and clutch drums get very hot during use. |
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Post by ckbrew on Aug 22, 2022 9:28:56 GMT -5
Thanks for the information on the chain. Now I need help with the bar. The bar I have is part number PT-18321-G4. power tip, 18 inch,.325 pitch, .05 gauge. The new part was advertised with part number PT-18321-04, but the number stamped in the steel is D1 04 PY. Does anyone have information about this part nomenclature? Is it interchangeable?
old and new bars:   |
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