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Fig.  67  Using SE-1368 Puller to Remove Crankshaft Gear
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  72  Checking cylinder Bore Out-of-Round
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE Remove the tappet oil gallery plugs by drilling a small hole in the plug and prying with a screwdriver or suitable tool.   Clean the tappet oil galleries with SE-2334-1 Brush (5/16" diameter). Replace    the    tappet    gallery    plugs    flush    to    .060"    below crankcase  surface  using  tool  shown  in  Figure  70.    The  tool may be made locally from cold rolled steel to the dimensions shown in Figure 70. Fig.  70  Tappet Oil Gallery Plug Installation 1.  Installer tool 4.  .200 2.  Oil hole 5.  .410 3.  .490 6.  .450 NOTE:      Coat   the   edges   of   the   plugs   with   a suitable nonhardening sealing compound prior to installation. If  it  becomes  necessary  to  remove  an  expansion  type plug  due  to  water  leaks,  drill  a  1/2"  hole  in  the  center  of  the plug and remove by prying with a screwdriver or suitable tool. When  installing  the  expansion  plug,  the  concave  side  of  the plug  must  be  installed  on  the  interior  of  the  cylinder  block. Coat   the   edges   of   #he   plug   with   a   suitable   nonhardening sealing  compound  and  install  using  a  1"  diameter  brass  drift and hammer. Inspection    of    the    cylinder    block    should    be    done carefully to detect any scoring of the cylinder bores, cracks or water   leaks.     Small   cracks   may   be   found   by   coating   the suspected    areas    with    a    mixture    of    light    motor    oil    and kerosene.  After wiping the area dry, immediately apply a coat of  quick  drying  liquid  such  as  zinc  oxide  powder  mixed  with wood    alcohol.       Wherever    cracks    are    present,    a    brown discoloration will appear in the white coating. Check the top surface of the cylinder block for trueness with a straightedge.  Test by attempting to insert a .006" feeler gauge ribbon between the straightedge and cylinder block .   If this is possible, replace the cylinder block. Each  cylinder  bore  should  be  checked  with  an  inside reading  micrometer  SE686  or  dial  bore  gauge  SE-2331  to determine  taper,  out-of-round  or  worn  condition,  Figure  71. Measure  the  diameter  of  the  cylinder  bore  at  the  top  of  the piston ring travel at right angle "A", Figure 72, to the centerline of the crankshaft.   Record the readings.   Next, measure each bore  so  the  gauge  reading  coincides  with  the  centerline  "B", Figure 72, of crankshaft.   The difference between "A" reading and "B" reading is the out-of-round condition at the top of the cylinder  bore.   Repeat  the  same  procedure  at  the  bottom  of the   ring   travel   to   check   for   out-of-round.      The   difference between   the   diameters   measured   at   the   top   "A"   and   the bottom "B", Figure 73, of the bore (at right angles to centerline of the crankshaft) is the taper of the bore. Fig.  71  Checking Cylinder Bore Using Dial bore Gauge SE-2331 CGES-210  Page 26 PRINTED IN UNITED STATES OF AMERICA

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