Remove dowel pins and fittings only if necessary

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Remove dowel pins and fittings only if necessary. 3-32.2. lnspection/Repair. NOTE Letters and numbers are stamped on top face of block at each cylinder bore. Letters (A or C) represent grade of piston installed during production. Numbers (1, 2, 3, or 4) represent grade of cylinder liner installed during production. However. when ordering a new cylinder liner for service repair either a No. 2 or No. 3 grade cylinder liner will be supplied. Either one may be used to replace whatever grade liner was used in production. a. Check cylinder block upper face warpage as follows. (1) (2) (3) (4) If not removed, remove dowel pin. Remove cylinder liner, refer to paragraph 3-32.1 step h. Using a straight edge and a feeler gage, measure the four sides and two diagonals of cylinder block upper face, refer to FIGURE 3-112. Standard warpage is 0.002 in. (0.05 mm) or less. If measured value exceeds 0.008 in. (0.2 mm) but is less than 0.016 in. (0.4 mm), regrind the cylinder block. If measured value is greater than 0.006 in. (0.14 mm), replace cylinder block. Change 2 3-165

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TM-9-2815-254-24 Diesel Engine Model DN4M 4 Cylinder 1.2 Liter Manual

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Measure cylinder liner bore as follows

ARMY TM 9-2815-254-24 AIR FORCE TO 38G1-94-2 (5) FIGURE 3-112. Cylinder Block Upper Face Warpage Measurement Standard cylinder block height is 10.748 in. (273 mm) with a limit of 10.732 in. (272.6 mm), refer to FIG- URE 3-113. FIGURE 3-113. Cylinder Block Height Measurement (6) Install cylinder liner, refer to paragraph 3-32.3. (7) Install cylinder bled< dowel pin. b. Measure cylinder liner bore as follows: (1) Using a cylinder indicator, measure cylinder liner bore at a point 0.59 to 0.75 in. (15 to 19 mm) from top of liner where most wear is present. Take measurement in both the thrust and axial directions of the crank- shaft. 3-166