Quantcast Fig.  75  Reboring Cylinder Using SE-1399 Boring Machine

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Fig.  72  Checking cylinder Bore Out-of-Round
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig. 78  Removing Third Bearing
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE inder   bore.     Never   use   gasoline,   kerosene   or   commercial cleaners  to  clean  cylinders.   Solvents  of  this  nature  will  not remove abrasives from the walls.  Rapid engine wear and ring failure results from failing to properly clean abrasives from the cylinders. However, if the wear exceeds the previously mentioned limits, it is recommended to rebore the cylinder of cylinders to within .003" of the required oversize diameter, Figure 75.  This will allow enough stock for the final step of honing the bores, Figure 76, so that the exact clearance may be obtained for the selected   oversize   piston.        When   performing   the   honing operation,   the   hone   should   be   stroked   up   and   down   to produce a crosshatch pattern on the cylinder wall as shown in Figure 77.   The faster the hone rotates, the faster it must be stroked   up   and   down   to   produce   the   desired   crosshatch pattern. NOTE:  After the honing operation is completed . the    sharp    burred    edge    that    develops    at    the bottom   of   a   newly   honed   cylinder   should   be removed    manually    with    emery    cloth .        Then thoroughly clean the block and cylinder bores. Fig.  75  Reboring Cylinder Using SE-1399 Boring Machine Wipe   as   much   of   the   abrasive   deposits   from   the cylinder  wall  as  possible.     Then  swab  out  each  abrasive- coated  cylinder  with  clean  SAE-10  oil  and  carefully  wipe  it with a clean cloth.  One swabbing and wiping is not sufficient. Three  complete  operations  are  usually  required  - more  may be   necessary.     Continue  cleaning  until  a  clean,  white  rag shows  no  evidence  of  discoloration  when  wiped  through  the cylinder  bore.   Never  use  gasoline,  kerosene  or  commercial cleaners   to   clean   cylinders   after   honing.     Solvents   of   this nature will not remove abrasives from the walls.  Rapid engine wear   and   ring   failure   result   from   failing   to   properly   clean abrasives from the cylinders. Fig.  76  Honing cylinder bore Using SE-784 Cylinder Grinder Fig.  77 Proper Honing Leaves a Crosshatch on the Cylinder Wall Inspect   the   camshaft   bearings   for   wear   and   proper running   clearance.      See   "Specifications."   If   the   limits   are exceeded,  replace  the  bearings.   This  can  be  accomplished with  the  special  camshaft  bearing  remover  and  installer  SE- 1897 with two SE-1897-7 adapters and the slide hammer and adapter from puller set SE-1879. NOTE:  Oil holes must be in alignment with holes in the crankcase. 1. Position one adapter SE-1897-7 in the second bearing with the flange to  -ward the rear of the block, Fig.  78. CGES-210  Page 28 PRINTED IN UNITED STATES OF AMERICA

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