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Cylinder Heads, Valves, Valve Guides, Springs, Etc
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig. 108 Installing Valve Guides with SE-1943 Installer and Adaptor
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE Inspect    the    valve    springs    for    proper    tension    as outlined  in  specifications.  Any  evidence  of  wear,  cracks  or permanent   sets   will   require   replacement.      SE-2241   spring tester,   Figure   104,   or   similar   tool   can   be   used   to   check tension. Inspect valve locks for excessive wear and replace in pairs    as    required.    Rotate    the    Roto-Coil    assemblies    and replace    if    any    wear    or    irregularities    are    noted.        Note particularly if the Roto-Coil is bound up or feels gritty. Remove  SE-1939  Holding  Fixture  (if  installed)  and position  the  cylinder  head  with  combustion  chamber  facing upward  on  support  blocks,  Figure  108.    This  preparation  is done for valve guide removal. Check     the     valve     guide     bore     dimensions     (see specifications).    Prior  to  inspection  it  is  necessary  to  clean guides.  There are many commercially available wire brushes and scrapers, Figure 105, that clean guides very satisfactorily. Similarly,   there   are   various   instruments   for   measuring   the guide  bores  small-bore  gauge  SE-2506,  plug  gauges,  etc., Figure 106. Plug gauges of the "go" and "no-go" type are most popular   because   of   the   facility   with   which   guides   can   be checked.          However,     there     are     two     undesirable     guide conditions which are difficult to check with gauges of this type: elliptical  or  egg-shaped  bore  wear  and  bell-mouthing  at  the port  of  the  guide.    Careful  guide  inspection  will  detect  egg- shaped wear while careful use of the "no-go" gauge will tend to    show    the    degree    of    bell-mouthing.        Replacement    is recommended  for  guides  having  bore  diameters  beyond  the recommended   limit   or   which   are   bell-mouthed   more   than .0005"   or   which   show   egg-shaped   wear.      Excessive   guide clearance prevents adequate cooling of the valve through the guide  and  also  allows  deposits  to  tilt  or  tip  the  valve  which may   cause   valve   breakage   at   high   engine   speed.      These conditions tend to prevent good seating and promote leakage across the valve face.  Excessive guide clearance also affects the proper lubrication of the valve stem. Fig. 105  Valve Guide Cleaning Tool 1.  Cleaning tool Fig. 106 Checking Guide Bore Using Gauge SE-2506 1. Cylinder head 3. Bore gauge 2. Valve guide Replacement   guides   are   designed   to   give   proper clearance when installed in the cylinder head.  Reaming is not required  but  care  must  be  taken  to  see  that-the  ends  of  the guides are not burred during installation. Fig. 107 Removing Valve Guides with SE-1722 1.  Hammer 3.  Support blocks 2.  Cylinder head 4.  Remover CGES-210  Page 39 PRINTED IN UNITED STATES OF AMERICA

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