COUPLING AS 3842442 - Caterpillar

Illustration 1 g01647617Note: Lubricate the camshaft lobes with a 50/50 mixture of 8T-2998 Lubricant and clean engine oil.Note: Lubricate the camshaft bearings with clean engine oil prior to installing the camshaft. (1) Lubricate the plate with clean engine oil. (A) Interference fit between the gear and the camshaft ... 0.10 mm (0.004 inch) (B) Diameter of the bearing journal ... 69.850 0.013 mm (2.7500 0.0005 inch)Bore in front and rear bearings for new camshaft ... 69.969 0.048 mm (2.7547 0.0019 inch)Bore in five inner bearings for new camshaft ... 69.982 0.061 mm (2.7552 0.0024 inch) (C) Thickness of new thrust plate ... 4.83 0.06 mm (0.190 0.002 inch)End play of camshaft ... 0.10 to 0.25 mm (0.004 to 0.010 inch)
Illustration 2 g01647619 (D) Specified camshaft lobe lift Exhaust lobe ... 8.783 mm (0.3458 inch)Inlet lobe ... 8.100 mm (0.3189 inch)Use the following procedure in order to determine the actual lobe lift:
Measure camshaft lobe height (E).
Measure base circle (F).
Subtract the base circle (F) from the camshaft lobe height (E). The difference is the actual camshaft lobe lift (D). Maximum permissible difference between the actual lobe lift that was found in Step 3 and the specified lobe lift of a new camshaft ... 0.13 mm (0.005 inch)