TM 5-3825-225-14&PNOTEWith new pistons, a machining allowance Is provided on the crown of the piston.Material may be removed by lathe so that, when fitted, the piston height above thecylinder block top face will be within 0.002-0.006 In. (0.051-0.152 mm).Figure 5-25. Checking new pistons.(12) Measure the piston height above the cylinder block top facewith the particular piston at TDC. This piston height can bemeasured by a piston height gage as shown in Figure 5-25.Repeat for each new piston to be fitted and mark each pistonwith the number of the cylinder bore to which it will belong. Donot mark on the top as any marking here will be removed bythe machining.(13) When each piston (5) has been skimmed, check it again whenfinally refitted to ensure that any new piston fitted is now withinthe limits quoted. Once the piston height is correct, mark anysuch piston on the crown with the number of its respectivebore (see Figure 5-21).(14) Install the oil pump (see paragraph 5-21).(15) Install the cylinder head assembly (see paragraph 5-15).f.Cylinder Sleeve Replacement (see Appendix E Figure 49).(1)The cylinder sleeves (6) fitted to the cylinders are centrifugally cast alloy iron. They are an interferencefit in the cylinder block parent bore and of the thinwall dry type. Reboring of these sleeves is notpossible. New sleeves should be fitted when a rebore would normally be considered necessary.(2)Dimensional checks of the cylinder bore are carried out using the gage tool as shown in Figure 5-26.When checking sleeves (6), each one should be measured in three positions: top, center and bottom.The readings being taken parallel and at right angles to the center line of the cylinder block give sixreadings for each cylinder bore. When checking the fitted internal bore of a new thinwall sleeve, allow aperiod of time to elapse for the sleeve to settle.(3)Remove all the various components from the cylinder block.NOTESupport the block locally in the area of the top of the sleeve.(4)Using a suitable press and shouldered metal disc slightly smaller on the outside diameter than the parentbore diameter, press the sleeve (6) carefully out through the top of the cylinder block.(5)Lightly lubricate the outside of the sleeve (6) with clean engine oil.Figure 5-26. Cylinder Bore Check.TA5063435-23
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