Stop in for a cup of coffee

Morning!
-8c
It looks like temps are on a downward slope now. Guess i need to bring another load of pellets in. I pack a few bags into bucket of tractor and drive right to pellet stove. Then fill it. Then a service for a buddy, and f150 for engine knock. The mysterious knock. I say its transmission.others say rod knock.has been driving it with this noise for over a month. And hasnt got any worse, i was hoping it would go boom. No such luck.