Davis Diesel piston reset tool for Cox .049

Greetings,

After getting back into CL flying after a 25 yr absence I found that my old Cox .049 stuff is a bit sloppy. I didn't know this until I read about piston rod slop.

So, I bought a piston rod reset tool from Davis Diesel Development. The price on the website is $12.95, but I got mine from them on eBay at an..er..better price. The tool consists of an aluminum piston holder and a hardened steel rod. The rod has one end shaped to fit the socket on the bottom of the piston and a slot for the rod.



I used a hammer and tapped the rod while turning it around until the rod slop was taken up. The piston rod was snug, but not so tight that it wouldn't move. I put the engine back together and it seems OK. Now it is too dark out to run the motor, but I'll post info on how my PT-19 runs later.

Later,
Greg in PA

Attachment #1, (jpg file)

There is some extensive research and hop-ups using this tool and others. Paul Gibeault (Designer of the Cox Venom) wrote an article that can be downloaded at the balsa beavers website. I'm going to give it a shot with one of my old 049 engines. I ordered one of those tools from him this past weekend. It sure does beat spending 340.00 clams for a used Venom on the bay.

>There is some extensive research and hop-ups using this tool
>and others. Paul Gibeault (Designer of the Cox Venom) wrote an
>article that can be downloaded at the balsa beavers website.
>I'm going to give it a shot with one of my old 049 engines. I
>ordered one of those tools from him this past weekend. It sure
>does beat spending 340.00 clams for a used Venom on the
>bay.
>
>
Please post a link to the "Balsa Beavers" site (or at least the article)! Thanks!

Big Bear <><
Character: It's what you do when no one else is watching.

balsa beavers website

then click the CL link on the left and scroll near the bottom of the page.