Derrick Sawyer
ArboristSite Guru
Starting my 661 rebuild project, pretty excited since its a cool saw and never ran a 661, plenty of experience on 066/660s though:
History: Got saw for parts, found a leaking decomp valve, leaking clutch side crank seal, one intake boot o-ring loose and partially blocking intake, and the biggest problem: main bearing on actual crank (big end) was roasted. Looks like a needle bearing was sent up the transfer and made dent in the top of the piston and cylinder, somehow the sides were not scored.
Plans: Got new parts (crank, crank bearings, gasket set, updated intake boot)with a good deal thanks to Johnsobri. I smoothed down the piston and will use it to sand down the raised indents in the cylinder roof and see if I can get this thing running, as I've never seen it running still worried how it might run, but gonna roll the dice on this one.
Pics: See below on the piston and cylinder i'll reuse, case and box of other parts:
IF anyone has any tips on 661 rebuild they learned, please let me know. I plan to test first without any mods or porting, unless the squish is so big I need to shave down the cylinder or delete base gasket. I did try and 066 crank but the counterweights were too big to fit, the 661 crank looks like a larger 460 crank, with the snap ring and longer section of larger diameter on the clutch side, though I thought I could use a 660 oiler worm gear metal sleave to modify the 660 crank to fit but it was a no go.
History: Got saw for parts, found a leaking decomp valve, leaking clutch side crank seal, one intake boot o-ring loose and partially blocking intake, and the biggest problem: main bearing on actual crank (big end) was roasted. Looks like a needle bearing was sent up the transfer and made dent in the top of the piston and cylinder, somehow the sides were not scored.
Plans: Got new parts (crank, crank bearings, gasket set, updated intake boot)with a good deal thanks to Johnsobri. I smoothed down the piston and will use it to sand down the raised indents in the cylinder roof and see if I can get this thing running, as I've never seen it running still worried how it might run, but gonna roll the dice on this one.
Pics: See below on the piston and cylinder i'll reuse, case and box of other parts:
IF anyone has any tips on 661 rebuild they learned, please let me know. I plan to test first without any mods or porting, unless the squish is so big I need to shave down the cylinder or delete base gasket. I did try and 066 crank but the counterweights were too big to fit, the 661 crank looks like a larger 460 crank, with the snap ring and longer section of larger diameter on the clutch side, though I thought I could use a 660 oiler worm gear metal sleave to modify the 660 crank to fit but it was a no go.