RE: DL-50 engine
Tim here is a link to Loctite. It has links to all of their retaining products for bearings with properties for them. I like the 648, and 620. I'm no pro, just my opinion.
[link=http://www.henkelna.com/cps/rde/xchg/henkel_us/hs.xsl/1554_USE_HTML.htm?countryCode=us&BU=ut&parentredDo tUID=0000000GHE&redDotUID=productfinder¶m1=pag eIndex%3D0%7Caction%3Dsearch%7Cmode%3Dadvanced%7Ck eyword%3D%7Cy%3D355%7Cx%3D0%7CapplicationRedDotUID %3D000000026R%7CsubsubapplicationRedDotUID%3D%7Csu bapplicationRedDotUID%3D000000028Z%7CbrandRedDotUI D%3D0000000389%7C]Loctite[/link]