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Disassembly of the re 1956 piston & conrod assy.
Page 1 of 1
Disassembly of the re 1956 piston & conrod assy.
Hello,
I have a pre 1956 Cox Thermal Hopper. Lots of play in the small end. Earlier attempts to tighten the small end joints of pre 1956 piston assys. using a swaging tool for the post 1956 design have not been successful. Neither have my attempts to remove the wire circlip.
Has anyone devised a successful method of removing the wire circlip on the pre 1956 Cox 049 engines?
Regards -
I have a pre 1956 Cox Thermal Hopper. Lots of play in the small end. Earlier attempts to tighten the small end joints of pre 1956 piston assys. using a swaging tool for the post 1956 design have not been successful. Neither have my attempts to remove the wire circlip.
Has anyone devised a successful method of removing the wire circlip on the pre 1956 Cox 049 engines?
Regards -
aeroland- Beginner Poster
- Posts : 8
Join date : 2012-07-27
Re: Disassembly of the re 1956 piston & conrod assy.
Welcome to the forum.
Is there any reason for trying to repair the piston assembly? I have disassembled the rod to piston joint when it pulled apart trying to free up the piston that was stuck in the cylinder. Not a good result. Is the cylinder of the early type with the smaller glow head? Do you plan on running the engine? I may have a "three piece" piston assembly if you need one. No guarantee on the fit to the cylinder bore though. P.M. me if interested.
Is there any reason for trying to repair the piston assembly? I have disassembled the rod to piston joint when it pulled apart trying to free up the piston that was stuck in the cylinder. Not a good result. Is the cylinder of the early type with the smaller glow head? Do you plan on running the engine? I may have a "three piece" piston assembly if you need one. No guarantee on the fit to the cylinder bore though. P.M. me if interested.
coxaddict- Gold Member
- Posts : 428
Join date : 2013-01-27
Location : north shore oahu, Hawaii
Disassembly of the re 1956 piston & conrod assy.
Hello coxaddict,
Thanks for your reply and greetings.
Reason to take assembly apart is the excessive end float of the conrod. I'd estimate that to be about 0.025". I usually set up the swaged type to have no detectable end float but the rod can swivel freely in the piston.
Thanks for the offer of a pre 1956 piston and conrod assembly, but as the piston is an excellent fit in the cylinder and conrod on the crankpin I plan to repair the assembly.
All my engines have to run and be in a fully serviceable condition.
I make any part for any model aero engine so plan to make a new slotted cup piece. Current thinking is from hardened and tempered steel.
Did occur to me lying in bed at 3 am unable to sleep that I could set the piston up in the Milling machine set to highest revs. and using a small diamond bit grind the middle of the wire circlip to "break its back" then prise out the ends with something like a dental pick. Would need to make a soft collet to hold the piston and some wire puller to hold the conrod to one side. Was hoping others had already devised an easier fix!
Regards -
Thanks for your reply and greetings.
Reason to take assembly apart is the excessive end float of the conrod. I'd estimate that to be about 0.025". I usually set up the swaged type to have no detectable end float but the rod can swivel freely in the piston.
Thanks for the offer of a pre 1956 piston and conrod assembly, but as the piston is an excellent fit in the cylinder and conrod on the crankpin I plan to repair the assembly.
All my engines have to run and be in a fully serviceable condition.
I make any part for any model aero engine so plan to make a new slotted cup piece. Current thinking is from hardened and tempered steel.
Did occur to me lying in bed at 3 am unable to sleep that I could set the piston up in the Milling machine set to highest revs. and using a small diamond bit grind the middle of the wire circlip to "break its back" then prise out the ends with something like a dental pick. Would need to make a soft collet to hold the piston and some wire puller to hold the conrod to one side. Was hoping others had already devised an easier fix!
Regards -
aeroland- Beginner Poster
- Posts : 8
Join date : 2012-07-27
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