Hey there folks,
I’ve run into a bit of a hiccup restoring my grandfather’s old QD-12.
After disassembly I noticed a great deal of play in one of the connecting rods…up/down, side/side and every other which way. Pressing out the wrist pin revealed this:
Might be kind of hard to see, but there is some pretty serious pitting and grooves worn in both the wrist pin and connecting rod…the brass(?) bushing in the connecting rod end is completely worn through in spots. There is a hole in the bushing and a hole in the connecting rod end that I’m assuming are supposed to be lined up for proper lubrication…they weren’t. 😕 has anyone seen anything like this before? The other piston/con rod seem totally fine.
Anyways it seems that the solution is a new con rod and wrist pin…
After digging up the part number I found the following con rod.
http://www.ebay.com/itm/375595-Connecti … 43b0b57d20
It’s listed as coming out of a QD-10, but the parts catalog lists the same part number for all QD motors, so I’m assuming they are all the same. Just wanted to verify with someone before I order the wrong part! He does have 2 rods available…would it make sense to replace the good one as well just for the sake of consistency?
Anyways, any thoughts or advice would be appreciated! I was very excited to find this thread – great resource!