Get a fairly long straightedge (36') a machinists rule would be best. The Nissan Diesel service manuals all say to have the head resurfaced following installation of new chambers, but I agree with Jesco and Grey as far as resurfacing goes.

A light smacks with the hammer and a piece of wood were all it took from that point.Ģ. The removable steel bottom half registers to a circular horizontal lip in the head, and indexes to that via a pin-in-slot arrangement, so you cannot rotate the precup incorrectly-once I cleaned both the head and the steel cup, and OILED THEM, the cup went about 75% of the way back in, palm-press fit, index engaged correctly via 'palm'. Clean the upper half of the swirl chamber, i.e., the hemispherical recess in the head. Go in through the injector hole, and make sure that the long drift you are using doesn't bind on casting hole the pintle injects through.Ģ. A cup of coffee (not beer), a 10-oz ball pein hammer, an 8' long drift, and three whacks (glorified taps, actually) and I had a swirl chamber lying on the ground. Getting those chamber inserts out is NO PROBLEM.