Here’s some pics of a pair of 13.3 liter Hino diesel cylinder heads that came in to get checked out. We performed a magnaflux and pressure test on them and no cracks or leaks were detected. The decks of both heads had impressions from the fire rings of the head gaskets embedding themselves into the surfaces of both heads. To fix this we surfaced both heads flat, square and smooth to the proper RA (roughness average). This required the valves and seats to be machined which is basically a valve job in order to reset the heads of the valves back to their proper protusion specs in relation to the surfaces of the heads.
Motor Mission Machine & Radiator 5435 Desert Point Dr. Las Vegas, Nv. 89118 Phone: (702) 649-2366 or (702) 649-0648 Fax: (702) 649-4133 www.MotorMission.com Facebook.com/MotorMission