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Post by sydney2904 on Mar 23, 2018 17:57:32 GMT -5
This is my second time here asking questions. Received great response on the first one. My C5 had 115 PSI compression cold and I wanted to know why. I removed the cylinder and found the chrome missing around the exhaust ports. There is about 1/8" directly above both ports. and about 1/4" below the port nearest to the top of the cylinder and less than 1/8" below the other one. There is some very very light scoring about half way between the exhaust ports and the top of the cylinder. The rings do not show any signs of scoring. My questions are: 1. What impact does the missing chrome around the exhaust ports have on compression since it is well below the compression zone? 2. What impact does the missing chrome have on the rings since the rings pass through this area on every stroke? 3. Does this impact the piston in pulling fuel into the cylinder. 4. Will a new set of rings improve the compression; if so, estimated amount? I am trying to understand why this saw had only 115 PSI. Thank you in advance for all the expert advice you will provide.
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Post by sweepleader on Mar 23, 2018 18:38:17 GMT -5
1,2 The are missing the chrome will change the timing of the port, 2,3,compression will leak out and power will leak out since the rings will not seal in that area. 4 Not likely. Time for a cylinder and rings at least. Likely the piston grooves are widened by the ring tipping as it passes over the area. Sorry, no good news.
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Post by tjthechainsawmech on Mar 23, 2018 23:41:09 GMT -5
Also to mention missing chrome creates extra friction which will damage a new set of rings in no time and score the hell out of the piston. I bought a running 775d that had decent compression and ran like a Champ, but upon removing the muffler cover my heart sunk....piston was scored and when I removed the cylinder the ENTIRE exhaust side of the cylinder's chrome was gone. Paid $100 for a boat anchor to. Oh well. More parts. haha But if I kept running that saw it would only be a matter of time. EDIT: Good news is C series saws are common so finding parts won't be horrible.
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