ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE After removing the plunger, the check valve assembly  may  be  found  to  be  loose  on  the  plunger.    Care should   be   taken   so   the   small,   flat   check   valve   and   valve retainer spring are not lost.  If the check valve assembly stays attached  to  the  plunger,  it  would  be  best  to  leave  it  in  this position. IV. Servicing the Lifter The   following   is   the   service   procedure   to   be   followed   in servicing hydraulic lifters: A Immerse   the   unit   in   carburetor   or   other   suitable solvent   to   remove   excess   engine   oil   and   soften varnish deposits. B. To   avoid   mixing   plungers   and   cylinders,   take   one lifter apart at a time and complete all servicing before working   on   another.      However,   if   tray   SE-1892, Figure   121,   is   available   for   keeping   plungers   and cylinders together, all lifters may then be disassembled at the same time. Fig. 121  Hydraulic Lifter Tray SE-1892 C. Wash all parts in solvent and clean all varnish from the plunger and inside diameter of the cylinder. D. Inspect the plunger and cylinder walls for scratches. Look  for  nicks  on  the  valve  seat  and  examine  the condition  of  the  lifter  face.    Check  for  plugged  oil holes. E. Try    the    plunger    for    free    fit    in    the    cylinder.    F. Reassemble all parts in proper sequence Figure 120. NOTE: The valve lifter body is to be filled 1/3 full with   clean   kerosene   before   assembly   of component   parts.      The   parts   are   to   be prelubricated  with  clean  kerosene  before assembly.      Use   of   kerosene   in   place   of engine oils provides a faster leakdown and rapid  expelling  of  trapped  air  in  the  lifter assembly,  thus  eliminating  the  possibility of     damage     to     the     valve     train     when installing  the  push  rods  and  rocker  arm shaft  assembly.  Engine  oil  will  dilute  the kerosene   in   the   lifters   as   soon   as   the engine is operated for a short period. G. After the unit has been washed thoroughly, determine whether the leakage past the plunger and cylinder is correct and if the check valve is functioning correctly. This  may  be  done  using  one  of  the  two  following methods: 1.     The  SE-1893  leakdown  tester,    Figure  122,  may  be used   for   checking   the   leakdown   rate   if   available. Instructions  which  accompany  the  tester  should  be followed. Fig. 122  SE-1893 Tester Used for Checking Leakdown Rate of Tappet 2. If the leakdown tester is not available, a finger check method can be used.  In order to check a unit in this manner, make sure there is no lubricating oil on the cylinder    or    plunger    such    as    immediately    after washing  in  solvent.    With  the  cylinder  held  in  one hand, start the CGES-210  Page 47 PRINTED IN UNITED STATES OF AMERICA