OS 61fx piston install question
#1
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OS 61fx piston install question
[]When I removed the piston & conrod, I forgot to mark it's orientation. Now I'm trying to determine which way the piston gets installed on my OS 61fx. The sleeve has a "V" that aligns with a pin on the block to ensure it is aligned correctly. The only sign I can find for alignment on the piston is a "bump" on the underside of the piston next to the journal for one of the wrist pins. Can anybody help me out? If not, I'll take my 50/50 chance since I didn't remove the conrod from the piston.
Cheers!
Art
Cheers!
Art
#4
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RE: OS 61fx piston install question
First, thanks for your replies! I think I need to clarify a little though... I pulled the piston and conrod out as an assembly by removing the sleeve first, then sliding the conrod off the crank and removing the piston/conrod assembly out the top of the block. Then, I cleaned all the parts, so the piston is too clean to see the exhaust port side- but that's a great idea! The only distinguishing mark I can find is on the piston. When I look up past the wrist pin, one wrist-pin journal has extra material molded into it that could be a counter weight or indication. I'll stop by the local hobby shop today as well to see if they can take a look- if you have other ideas, I'm sure open!
Cheers and thanks again!
Art
Cheers and thanks again!
Art
#5
RE: OS 61fx piston install question
Art, Flypaper 2's tip is what I'd look for. One end of the hole for the crank pin at the big end of the connecting rod will be beveled to match the slight radius at the base of the pin.