BALANCER UNIT - J.3 When  replacing  needle  or  roller  race  bearings,  they should   not   be   hammered   in,   but   pressed   in   using   a suitable  dolly.   Needle  race  bearings  should  be  pressed in  to  a  minimum  of  0.008  in  (0,20  mm)  from  the  end  of the housing.  Thicker section roller race bearings should be   pressed   in   so   that   a   clearance   of   0.030/0.040   in (0,76/1,02   mm)   is   left   between   the   end   faces   of   all bearings and inside face of the frame bosses. Having  renewed   any   part   showing   signs   of   wear, proceed as follows:— Replace  the  seven  plugs  in  the  oil  drillings  of  the balancer frame. Should  it  have  proved  necessary  to  renew  the  idler gear   and   hub   securing   stud,   fit   the   new   stud,   using "Loctite". Should   it   have   been    necessary    to    remove    the coupling gears from the balance weights, using "Loctite", re-assemble.        finally    tightening    the    socket    headed capscrews to a torque of 11 Ibf ft (1.52 kgf m) - 15 Nm. Where necessary, renew the shaft keys. Stand  the  balancer  unit  on  its  lubricating  oil  pump end face. Place  the  two  balance  weights  complete  with  gears into   the   frame,   coupling   the   gears   so   that   when   the shafts  are  partially  entered,  the  keys  are  in  the  same relative  position,  i.e.,  both  at  top  dead  centre  or  both  at bottom dead centre. Ensure that each shaft is related dead centre to the bushes  at  the  front  end  rear  of  the  frame  and  press  in until the drive shaft (with integral gear) is fully home and the  end  of  the  driven  shaft  is  flush  with  the  drive  end face of the balancer frame. Extreme  care  must  be  taken  when  pressing  in  the shafts,  to  prevent  the  keys  from  touching  the  drive  end bushes   (where   fitted)   or   the   needle   bearings   as   they pass  through.    The  slightest  damage  caused  this  way could     result     in     seizure     of     the     unit     and     severe consequential damage to the engine. Using   "Loctite",   fit   the   two   grubscrews   to   each balance  weight  and  tighten  to  a  torque  of  7-1/2  Ibf  ft (1,03  kgf  m)  -  10  Nm.    Do  not  omit  degreasing  before using "Loctite". Fit thrust plate, idler gear and hub so that the single centre  punch  mark  on  the  idler  gear  registers  between the two punch marks on the integral balance shaft gear. Ensure    that    the    dowel    in    the    hub    locates    in    the corresponding hole in the balancer frame. Fit  the  idler  gear  and  hub  retaining  nut  or  setscrew and tighten to a torque of 40 Ibf ft (5.53 kgf m) - 54 Nm. Revolve   the   unit   by   means   of   the   idler   gear   to ensure that the action is quite free. Place the oil pump back plate in position at the rear of the balancer unit. Fit   the   oil   pump   drive   gear   onto   the   end   of   the balancer drive shaft. Fit  the  oil  pump  idler  gear  onto  the  idler  shaft  in  the pump  and  refit  the  pump  housing  to  the  balancer  unit, securing  with  seven  setscrews  and  washers  to  a  torque of 21 lbf ft (2.90 kgf m} 29 Nm. Revolve  the  balancer  unit  idler  gear  once  more  to ensure freedom. Continue   revolving   the   idler   gear   until   the   punch marks   once   more   coincide.      This   may   take   several revolutions. To Replace Place  the  two  locating  thimbles  into  their  bores  and refit the balancer unit to the cylinder block, ensuring that the   single   centre   punch   mark   on   the   crankshaft   gear registers between the two punch marks on the idler gear of the balancer unit. The balancer unit is now timed to the engine.  When fitting the balancer unit to an engine where the front end has  not  been  stripped,  it  will  not  be  possible  to  observe the punch mark on the crankshaft gear for the purposes of timing the unit to the engine. In  this  case,  the  engine  should  firstly  be  rotated  so that either the piston of No. 1 or No 2 cylinder is at top or bottom  dead  centre.    Bottom  dead  centre  is  preferable as any error greater than one gear tooth will cause a foul between   the   weights   and   the   connecting   rod   in   this position,  making  it  obvious  that  the  balancer  unit  has been timed wrongly. Revolve  the  idler  gear  until  the  single  centre  punch mark  on  the  idler  gear  registers  between  the  two  punch marks on the balancer shaft drive gear. Suitably mark with chalk, a tooth of the drive to align with another chalk mark on the frame. In  this  position,  fit  the  balancer  unit  to  the  engine, checking that the weights have not moved