TM 9-2910-226-34 (2) Manually work plunger up and down, rotating slowly to make sure plunger is free in bore There cannot be any binding. (3) Refer to figure 3-102. Using suitable feeler gages check plunger sleeve slot width (A). Replace head if slot width is greater than 0.1007 in. Sleeve should fall of its own weight on plunger. If it does not, lubricate with diesel fuel and recheck. If sleeve does not free up, discard head assembly. Figure 3-102. Inspection of spill ports and plunger sleeve. 3-63