L/S SUB AS 1247817 - Caterpillar

Depth gauge.Use depth gauge to measure progress when nearing the depth needed to install the thinnest insert. Reduce machine depth to .025 mm (0.001 in) per cut until reaching the final depth. Measure to verify actual insert thickness and install insert so that it is flush with the top of the block within 0.013 mm (.0005 in). The bore in the block for the insert should be 144.051 0.025 mm (5.671 .001 in).
Left: A good counterbore. Right: Chatter marks must be cleaned up before assembly.
Counterbore machining.If counterboring to the depth of the thinnest insert does not clean up 100 percent of the erosion/crack damage, machine to the depth of the next insert. At the time of installation, the stainless steel inserts are installed dry (WITHOUT the use of sealants). 1. The design of insert (1) and the size of the counterbore give the insert a slip (loose) fit in the cylinder block. The outer diameter of the counterbore is 144.051 0.025 mm (5.671 .001 in). If the counterbore has been cut correctly, the top of the insert will be even or within 0.0127 mm (0.0005 in) of the top surface (A) of the cylinder block to give the necessary projection for the cylinder liner. Location (B) shows the liner seat area that must clean up 100 percent before it is permissible to install an insert in the counterbore. The radius (C), 0.64 0.13 mm (0.025 0.005 in), is determined by the cutting tool.2. There is a plus or minus tolerance for the thickness of the insert and for the depth of the counterbore. When inserts are installed in a cylinder block, there must be no more than 0.05 mm (0.002 in) difference in height between the inserts of any two counterbores that are next to each other. It is necessary then, to measure the depth of each counterbore and install an insert of the correct thickness to give the 0.05 mm (0.002 in) specification. The insert thickness should be measured prior to installation to determine the plus or minus tolerance.
Counterbore deburring.When machining is complete, deburr both edges of the counterbore with emery paper or #400 wet-dry sandpaper. Use a wet-dry vacuum to remove cuttings from cylinder bores, water jacket and head bolt holes. Remove plastic bore plugs, foam inserts, paper towels, tape and all other protective covers. If necessary, run threaded tap down head bolt holes to remove burrs and thoroughly clean out head bolt holes. Wash down cylinder block with solvent or use pressure air to ensure block/crankshaft/lifter bore cleanliness. Install inserts dry (no sealant) with chamfer facing down.Cylinder Liner Projection
This procedure alleviates the need for the "H" bar to hold down liners during projection measurements.
Illustration 1.
Liner projection components1. Bolt.2. Hard washer.3. Washer.4. Fabric washer.5. Spacer plate.6. Spacer plate gasket.7. Cylinder liner.8. Block. Install clean liners or cylinder packs (without the filler band or the rubber seals), spacer plate gasket and clean spacer plate. Install bolts and washers, as indicated previously,