Lycoming O-360 Shut-down techniques

[roundsounds]

Originally Posted by Mach1Muppet

G'day all,

Been reading about O-360 shut down tips especially:

1. Lean, operate at 1200 rpm for 1-minute. (While taxiing?)
2. Operate at 1800 rpm for 20-seconds
3. Reduce to 1200 rpm and kill with mixture.

How true is the above? Has anyone seen the major issues surrounding improper shutdown?

Cheers,
Mach1

Here’s a current service letter recommending this procedure. However, you need to read the entire document and may find it doesn’t apply to the engine / spark plug combination you’re operating.
https://www.lycoming.com/sites/defau...%20Fouling.pdf