SERVICE MANUAL CONNECTING RODS, PISTONS, RINGS & SLEEVES Section 5 3. If   the   measurements   are   not   within   the specified  limits,  and  the  torque  wrench  is known  to  be  accurate,  remove  the  bearing from the connecting rod and replace it with a new bearing. NOTE:        With    the    precision    bearings    used,    no problem    should    be    encountered,    providing    the crankshaft and connecting rod are in good order. d. Check connecting rod end clearance, using a  feeler  gauge  as  shown  in  (Fig.  13)  maximum permissible bearing end clearance on crankshaft is 0.46 mm (0.018 in.). 1. The   feeler   gauge   MUST   cover   both   the connecting rod and cap (Fig.  13). Figure 13.  - Checking Connecting Rod End Clearance 2. Excessive clearance may require replacement of the rods or shaft. 3. The  check  MUST  be  made  to  be  certain that the specified clearance exits. 4. Lack of clearance could indicate a damaged rod or perhaps a rod bearing out of position. Clean Pistons as follows: 1. Soak the piston and piston pin in ‘soap solution (until carbon is soft) and clean thoroughly. NEVER USE A CAUSTIC SOLUTION. 2. Clean    all    carbon    from    the    piston    ring grooves;  using  a  nonmetallic  brush.    Be sure all oil holes in the piston are open. Inspect Pistons as follows: 1. Visually  inspect  the  pistons  for  scuffed  or scored  skirts  and  cracked  or  worn  piston ring lands.  Replace the piston if necessary. 2. Check    running    clearance    between    the piston and cylinder sleeve (with piston rings removed) for piston skirt wear. Measure at the   largest   piston   diameter.      If   running clearance  exceeds  0.165  mm  (0.0065  in.) replace the piston. 3. Visually  inspect  the  piston  pins  for  wear. Replace   any   pins   which   show   signs   of corrosion or etching. Inspect Piston Rings as follows: 1. Visually inspect NEW rings for any signs of damage prior to installation. NOTE:    Faulty  rings  cannot  always  be  detected  by the  eye.    Therefore,  whenever  a  piston  is  removed from  a  cylinder,  it  is  recommended  that  the  piston rings be rep-laced. 2. Prior  to  installing  the  rings  on  the  pistons, check   each   ring   for   proper   ring   gap   as follows: a. Push   the   ring   down   into   a   new   cylinder sleeve with a piston.  (This will position the ring squarely in the sleeve). b. Measure  the  gap  between  the  ends  of  the ring with a feeler gauge as shown in (Fig.  14).  If ring    gap    does    not    meet    the    specifications outlined in this section replace the ring. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 15