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Disassembly of the re 1956 piston & conrod assy. Babe_b10
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Disassembly of the re 1956 piston & conrod assy.

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Disassembly of the re 1956 piston & conrod assy. Empty Disassembly of the re 1956 piston & conrod assy.

Post  aeroland on Sat Feb 09, 2019 12:01 am

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 -
aeroland
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Post  coxaddict on Sat Feb 09, 2019 2:02 am

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.
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Disassembly of the re 1956 piston & conrod assy. Empty Disassembly of the re 1956 piston & conrod assy.

Post  aeroland on Sat Feb 09, 2019 3:13 pm

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!

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