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Fig.  70  Tappet Oil Gallery Plug Installation
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  75  Reboring Cylinder Using SE-1399 Boring Machine
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE Fig.  72  Checking cylinder Bore Out-of-Round 1.  “A” 2.  “B” Fig.  73  Checking Cylinder Bore Taper 1.  "A" 2.  "B" If the cylinder bore does not exceed the limits of .002" out-of-round   and/or   .005"   taper,   new   standard   size   service piston  rings  will  give  satisfactory  performance  provided  the piston clearance is not excessive. Cylinder bore blocks can be deglazed by the use of SE- 2314-5  glaze  breaker  brush,  Figure  74.   This  silicon  carbide tipped nylon flexible brush quickly deglazes cylinder walls and produces a crosshatch pattern on the cylinder wall surface in a  single  operation.   The  brush  contours  itself  to  the  cylinder wall   and   conditions   the   wall   surface   without   altering   the cylinder bore. Fig.  74  Deglazing Cylinder Wall Surface Using SE-2314-5 Glaze Breaker Brush and Electric Drill The  SE-2314-5  brush  is  used  in  conjunction  with  an electric  drill,  Figure  74.   A  slow  RPM  drill  is  recommended. Most 3/8" capacity electric drills are satisfactory for driving the brushes.   A drill speed of 350 - 500 RPM has been found to be a practical speed for deglazing IH cylinder block bores. A  lubricant  should  be  used  with  the  silicone  carbide- tipped brush to produce a desirable finish on the wall surface . A lightweight engine oil (SAE-30) provides adequate lubrication  for  deglazing  cylinder  block  bores.    The  lubricant also   controls   airborne   particles   which   can   be   easily   wiped from the cylinder bore with a cloth. When   conditioning   cylinder   block   bores,   stroke   the brush up and down in the bore at a rate of 30 - 40 strokes per minute for a duration of 15 - 20 seconds per cylinder bore.   In most instances, 20 seconds is adequate time for the brush to break cylinder wall glaze and produce a crosshatch pattern on the cylinder wall surface. Thoroughly  clean  cylinder  bore  walls  after  deglazing. Wipe   as   much   of   the   abrasive   deposits   from   the   wall   as possible.   Then  swab  out  each  abrasive-coated  cylinder  with SAE-10  oil  and  carefully  wipe  it  out  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    cloth    shows    no evidence of discoloration when wiped through the cyl- CGES-210  Page 27 PRINTED IN UNITED STATES OF AMERICA

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