TM 10-3930-653-14&P (2)   Measuring lubrication (oil) clearance Measure the inside diameter of each bushing with a bore  gauge.    If  lubrication  (oil)  clearance  exceeds    the prescribed  limit,  replace  the bushing. Fig. 4-69.  Measuring Bushing l.D. Correct to within Service  (clear ance) limit Lubrica- tion (oil) Front & rear 0.025 to 0.051 (0.0010 to 0.0020) 0.1(00039) clearane Center 0.038 to 0.062 mm (in) (0.0015 to 0.0024) 0.15 (0.0059) (6)   TIMING SPROCKET (1)   Inspecting cam  gear for wobble With the camshaft and camshaft sprocket placed on V-blocks.      measure   camshaft   sprocket   wobble,   and correct  or  replace  the  cam  gear  if  wobble  exceeds  0.1 mm (0.0039 in).  Also inspect the sprocket for broken or damaged  teeth  and  for  wear  or  damage  on  the  boss surface.  If excessively worn or damaged, replace with a new gear. Fig. 4-70.  Checking Camshaft Sprocket Wobble (7)   FRONT COVER AND HYDRAULIC PUMP CHAIN COVER Inspect the installation (mating) surface and oil seal. If damaged or faulty, correct or replace as required. 4-2-4-12. VALVE ROCKER MECHANISM (1)   VALVE LIFTERS Inspect the periphery of the valve lifter and the cam contact  surface.    Replace  the  valve  lifter  if  excessively worn,   damaged   or   fused.      Also   check   for   fit   in   the cylinder block and replace if fit is not proper.  Fit should be such that the lifter, with oil applied, lowers slowly and naturally In the hole in the cylinder block. Fig. 4-71.  Measuring Diameter of Valve Lifter Correct to Service limit within Fit (clearance) of valve lifter and 0.016 to 0.052 0.1 (0.0039) cylinder block (0.0006 to 0.0020) hole mm (in) Fig. 4-72.  Measuring Push Rod Bending 4 - 40