Here’s some pics of an Isuzu NPR diesel cylinder head off of a 4HK1 engine. The head was brought in because the engine was getting coolant on top of the pistons. After cleaning the head in our hot tank we pressure tested it in our pressure tester and found all four of the injector sleeves to be leaking. We ended up performing a complete valve job and surface along with R&Ring the injector sleeves with a final pressure test to ensure it doesn’t leak.
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