Valve guide wear

[Doug&Deb]

I understand that worn valve guides cause smoke from the tailpipe while decelerating but I don’t understand why it takes 20 minutes or so of driving to start. Is it the oil thinning out because of the heat? Obviously the guides weren’t replaced during the rebuild. I’ll do better next time lol. If this thing didn’t leak and burn oil I wouldn’t know what to do.

[Sniper]

Holes expand with heat, so the guides are probably at their loosest after 20 minutes.

[keithb7]

I wonder if heat is also a factor with oil mist.  It takes a while to get the oil hot. It splashes around in the crankcase. Hotter and thinner. Hot oil mist moving around in there. Sucked up through the worn valve guides. Cold, the thick oil is not doing this?

Edited September 17, 2022 by keithb7

[Doug&Deb]

Makes sense. I sometimes feel like James Bond laying a smoke screen. It does keep people from tailgating lol.