Quantcast FIGURE 3-141.  Measuring Cylinder Block Top Deck Flatness

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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 FIGURE 3-141.  Measuring Cylinder Block Top Deck Flatness CAUTION When  cylinder  block  Is  machined  (top  deck  or  crankshaft  bearing  bores),  the  dimension  from centerline of crankshaft bearing bore to top deck will be changed.  Make sure that this dimension will not be less than 11.889 Inches (301.98 mm).  Otherwise, piston may contact cylinder head. CAUTION If cylinder block top deck is resurfaced, also measure depth of liner counter bores.  Bore depth must be within 0.234 to 0.236 Inch (5.95 to 5.99 mm). d. Measure cylinder liner height as follows: NOTE If liner height was not checked when liners were removed, refer to paragraph 334.6., step e, or a new liner is being installed in a new or used cylinder block, liner height must be checked. (1) Be sure liner bore in cylinder block is clean. (2) Install liners without -rings and packing. CAUTION Liner  should  rotate  smoothly  by  hand  when  Installed.    If  remove  liner  and  polish  bottom  liner pilot bore in cylinder block with emery cloth.  Use a shop towel or other suitable means to collect debris when polishing bore. (3) Install  liner  with  its  mark  toward  the  front  of  the  engine.    Secure  with  capscrews  and  washers.    Tighten screws to 50 ft-lbs (68 Nm). (4) Using gage (JDG451) and dial indicator, measure each liner height in four places, at approximately 1, 5, 7, and 11 o'clock positions as viewed from the rear of the engine (flywheel end).  Record all measurements. (5) Liner  height  specification  is  0.0004  to  0.004  inch  (0.01  to  0.10  mm).    Maximum  permissible  difference between readings within one cylinder or between adjacent cylinders is 0.002 inch (0.06 mm). 3-201


 


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