CYLINDER HEAD—E.8 Fig. E.12. Adjusting Valve Clearance. 4. Adjust  valve  clearances  to  0.012  in  (0.30  mm)  in the following manner:— (a)   With  the  valves  rocking  on  No.  4  cylinder,  set the clearances on No. 1 cylinder. (b)   With  the  valves  rocking  on  No.  2  cylinder,  set the clearances on No. 3 cylinder. (c)   With  the  valves  rocking  on  No.  1  cylinder,  set the clearances on No. 4 cylinder. (d)   With  the  valves  rocking  on  No.  3  cylinder,  set the clearances on No. 2 cylinder. Using a new   joint,  lit  the  rocker  cover  and  secure with four plain washers, spring washers and screws. 5. Assemble  the  inlet  and  exhaust  manifolds   to   the cylinder   head   using    new        joints    and    caskets. Connect the electrical lead and fuel feed pipe to the thermostart unit. 6. Refit    the    atomizers    with    new    copper    sealing washers and tighten down the securing nuts evenly ensuring the atomizer is squarely on its seat.  Refit the  high  pressure  fuel  pipes  to  the  injection  pump and atomizer, (see Pages N.9 and N.13). 7. Fit  the  breather  pipe  assembly  to  the  cylinder  head cover. 8. Refit  the  fuel  filter  to  the  cylinder  head  securing  it with the  w(o  setscrews  and  spring  washers.    Refit the  fuel  pipe  connecting  the  lift  pump  outlet  to  the fuel filter. 9. Fit   the   fuel   pipe   connecting   the   fuel   filter   to   the injection  pump  inlet  also  the  pipe  connecting  the injection pump outlet to the fuel filter. 10. Refit the atomizer leak-off pipe assembly. 11. Fit the heat exchanger and secure with the setscrews. 12. Reconnect the lubricating oil pipes to the lubricating oil cooler. 13. Reconnect  the  water  connection  between  the  fresh water  pump  and  the  heat  exchanger,  also  the  sea water connections between the heat exchanger and exhaust manifold jacket. 14. Using  a  new  gasket,  connect  the  exhaust  pipe  to the exhaust manifold. 15. Refit  the  air  filter  and  connections.    Fit  the  water outlet hose.  Re-connect the battery terminals. 16. Fill  the  cooling  system  with  clean  water  ensuring that  the  drain  taps  are  turned  off.    Check  for  water leaks. 17. Bleed  the  air  front  the  fuel  system  as  detailed  on Page N.14 and start the engine. 18. Run the engine  until  normal  operating  temperature is     attained     and     retighten     the     cylinder     head nuts/setscrews,  in  sequence  Fig.  E.11,  and  to  the correct torque as given on Page B.1. Note: When retightening cylinder head nuts/setscrews,   the   engine   coolant outlet    temperature    should    not    be less,,  than  170°   F  (77°  C).    If  the  nut setscrew   moves   when   retightened, then  tighten  up  to  the  torque  quoted on Page B.1.  If the nut setscrew does not move before the correct torque is achieved.  then slacken off 1/12 to 1/6 of a turn (30°  to 60° ) and retighten to the  correct  figure  After  retightening all   the   nuts/setscrews,   the   first   10 positions should be rechecked without    further    slackening    off    to ascertain   they   are   still   tightened   to the torque quoted. 19. Reset  the  valve  clearance  to  0.012  in  (0.3,0  mm) cold   (see   item   4).      Fit   the   cylinder   head   cover ensuring that there are no oil leaks at the joint. Note:  After  the  first  25/50  hours  running,  the  rocker assembly  should  be  removed  and  the  cylinder  head nuts/setscrews    again    retightened    to    the    correct torque and the sequence shown in Fig. E.11.  Ensure the  correct  procedure  is  followed  as  in  above  18. Replace rocker assembly and set valve clearance to 0.012 in (0.30 mm) with the engine cold. As from Engine Nos. 236U135765 and 236U147150L.  engines are built to conform to BSAU141a 1971 regulations and should only be fitted with the later cylinder head and cylinder head gasket.  The valve depths should also conform to the Production limits as given on Page B.7.