How long has this been an issue? You should start a flush and once established let it flush for an hour. My reach rod has a cotter pin in it to hold it on the valve stem. If your pin broke........... well I would start flushing first. then when its clear/clean let it drip dry and crawl under it to inspect. I made a small slit in the underbelly and replaced the cotter pin.
Don & Dona W/yorkies Gizmo, Master Chief, & Tali
2011 Flagstaff 8528 BHSS 2015 Ford 6.7 XLT
2010 Full Timers & Still Going