Figure 13-52. Cylinder Block Height Checking Location

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 removing only enough material to make block usable. (c) Check distance from centerline of main bearing to top of block (1, figure 13-52). Refer to tabulated data in Chapter 1 for dimensions. (d) Finish surfaces to 125 rms. (e) Resurface counterbore to obtain proper linear protrusion. Check liner to block contact in crevice seal area. Figure 13-52. Cylinder Block Height Checking Location (7) Cylinder Head Capscrew Threads. (a) Drill out old threads with 23/31 inch drill to a depth of 1-7/8 inch drill to a depth of 1-7/8 inches (47.63 mm) from the cylinder block top surface. (b) Tap drilled hole to a depth of 1-3/4 inch (44.45 mm). (c) Install heli-coil insert with inserting tool until it is 1/2 inch (12.70 mm) below top surface. Break off insert tang using a punch and hammer, not an inserting tool. d. Overhaul and Rebuilding of Cylinder Block. Proceed as follows: (1) Cylinder Liner Counterbore. (a) Check upper liner counterbore and remove burrs and dirt so liner will enter cylinder block without distortion. If counterbore exceeds limits listed in Chapter 1 for the top 0.400 inch (10.16 mm) depth, mark block for counterbore repair. The counterbore ledge must be smooth and perpendicular to the liner bore to within 0.005 inch (0.13 mm) total indicator reading. Use straightedge to check flatness of top of block. (b) Check counterbore depth so installed liner will be assembled to correct protrusion and to determine if refinish of counterbore surface is necessary. Depth of counterbore in a new block is listed in Chapter 1. If worn to or beyond limit, the cylinder block must be salvaged. If worn less than worn limit, the surface can be refinished and shims installed under the cylinder liner to restore proper protrusion. Refinished counterbore radius must be 0.025 to 0.30 inch (0.63 to 0.76 mm). (c) Installed cylinder liners must protrude 0.003 to 0.006 inch (0.08 to 0.15 mm) above block. To check for proper protrusion without installing a liner, proceed as follows: 1. Measure liner flange outside bead with micrometer. Do not include bead on top of liner flange in taking measurement. 2. Measure block counterbore 13-100

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