Originally Posted by
RDJeff
Hi gang,
I bought a used .09 R/C engine a while back, took it apart and cleaned it up a little (didn't need much). I finally got around to mounting it on a plane, and took it to the field last week. I was using an electric starter, and it spun up just fine, and was starting to fire, when I noticed fuel leaking out of the cylinder/muffler joint. When I looked closer, I found two of the three cylinder screws were broken, and the third was bent! They were fine when I took it apart earlier.
I have a lot of time on larger PAWs, so I have a fair understanding of how to run them, so what have I done wrong? Could it have been over-compressed? Does anybody know what size cylinder screws I need to look for?
Thanks!
Jeff
Jeff,
the cylinder screws are 6 B.A. (aka British Associated).
Probably not a thread type readily available in Alaska.
Otherwise they're easy to get either from PAW or a Model Engineering materials source in the UK. Perhaps there's one that stocks them in Canada?
The stock PAW screws are relatively soft, probably deliberately so. They may do this so the screws will fail before you do any real damage to the engine.
Are the rod and crankpin ok?
Generally speaking it's usually safer to flick start a small diesel rather than using a starter.