You'll find a 1922 Waukesha Motors Company Engine.
Appears to be some sort of engine used for irrigation on steel wheels. You'll also find some other vintage items nearby.
The hint is a spoiler but please read it so it's hid in it's proper location. Caches seem to move around. This location is the only dry spot on the engine. Thank you.
zntargvp, haqre sebag.