SERVICE MANUAL LUBRICATING OIL PUMP, OIL FILTERS & COOLER Section 8 2. With    oil    pressure    regulator    valve    removed, inspect for proper dimensions of oil drain hole (2, Fig. 14). 3. If drain hole is obstructed, the following procedure should be performed: a. Drain oil and remove oil pan. b. With  oil  pressure  regulator  valve  removed, block off all horizontal oil passages indexing with   oil   pressure   regulator   valve   -   using grease impregnated rags. c. Using  a  drill  and  die  grinder,  enlarge  the drain hole by removing thick iron or iron and burnt  in  sand  from  the  casting.    Drain  hole is  accessible  from  bottom  of  crankcase  at inner wall. d. THOROUGHLY    FLUSH    entire  area  with engine   oil   ensuring   all   foreign   matter   is removed. e. Install  oil  pan.    Tighten    oil  pan  mounting capscrews to 20 N•m (15 Ibf-ft.) f. Replace     oil     pressure     regulator     valve. Tighten to 230 N•m (170 Ibf-ft). g. Fill engine to specified level. h. Check  engine  oil  pressure  with  engine  at normal operating temperature. Inspect the 011 Pick Up Tube as follows: 1. Pressure  test  the  tube   using   the   following   to perform the test: a. Air  pressure  gauge,  0  to  350  kPa  (0  to  50 psi range). b. Miscellaneous pipe fittings. c. Regulating air control valve. d. Foam rubber pad, 100 mm (4 in.) sq. X 25 mm (1 in.) thick. e. Air supply. f. Soap solution. g. Accurate torque wrench. 2. Remove the oil pan. 3. Check  the  torque  25  N•m  (18  Ibf-ft)  of  the  oil tube flange mounting bolts. 4. Remove the engine oil cooler bottom drain plug. NOTE:  The side drain plug Is for engine coolant. 5. Install   the   necessary   fittings,   air   gauge   and regulator at the drain plug top boss. 6. Apply   foam   rubber   to   seal   oil   pick-up   tube suction screen. 7. Connect  the   air   supply   hose   to   the   regulator valve. NOTE:    Keep   the   air   regulator   valve   closed   when connecting air supply hose to regulator valve. 8. Gradually  open  the  air  control  valve  and  apply 140  to  205  kPa  (20  to   30   psi)   at   air   gauge (mounted   at   outlet   of   air   regulating   valve)   to maintain 20 to 35 kPa (3 to 5 psi) air pressure in pipe. 9. Check   oil   pick-up   pipe,   using   prepared   soap solution as follows: a. Tube - Check tube for cracks. b. Oil Pick-Up Housing - Check metal housing for  seam  cracks  and  braze  connection  of housing to tube. c. Support  Bracket  -  Check  for  leaks  where bracket is brazed to pipe. d. Manifold  -     Check   where   pickup   tube   is brazed to the manifold. e. Mounting  -  Check  the  manifold  to  gasket and to mounting of the front cover. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 11