d. Repair  or  Replacement.    Refer  to  paragraph  6- 3.c for general repair or replacement instructions. (1) Weld any cracks in frame. (2) Replace fuel tank if seams are split or there are cracks. e. Assembly.        To    assemble    the    frame    group proceed as follows: (1) Install  cup  (16)  and  drain  plug  (15)  on  fuel tank (14). (2) Install  fuel  tank  (14)  in  frame  (17).    Place webbing (13) and straps  (12)  in  place,  and install washers (11) and nuts (10) on straps (12). (3) Position  engine  supports  (9)  on  frame  (17) and  secure  using  screws  (8),  washers  (7) and  nuts  (6).    Position  battery  support  (4) between engine supports (9), install J-bolts (5), battery (3), battery retainer (2) and wing nuts (1).  In-stall battery cables after engine has been installed. 6-42.  TABLE OF LIMITS.  The minimum and maximum limits   in   the   following   Table   of   Limits   represent   ideal limits.    Measurements  not  exceeding  the  replacement maxi-mum  permits  the  part   to   be   retained   in   service. Parts for which tolerances are given are not  necessarily reusable    if    they    are    otherwise    worn    or    damaged, although their dimensions may be within these specified. 6-43.      Refer   to   Table   6-1   for   wear   limits,   end   play, clearances, and backlash, as applicable.  Refer to Table 6-2 for spring data and specific torque limits. 6-44.  TEST.  The following paragraph contains all the nec-essary operating instructions and tests to be performed after repair of the air compressor unit to ensure satisfactory operation.  To perform the tests, proceed as follows: NOTE Refer   to   LUBRICATION   INSTRUCTIONS   (Section   V) and    make    certain    air    compressor    unit    is    properly lubricated.  To perform the tests, proceed as follows: a. Make certain CLUTCH operating rod (11, Figure 4-2 is in disengaged position, away from control panel. b. Make certain COMPRESSOR UNLOADER switch  (16,  Figure  4-2)  is  in  the  UNLOAD  position  and close all control panel valves. c. Make  certain  ENGINE  THROTTLE  CONTROL (10, Figure 4-2) is positioned half way in (idle position, 1, 000 + 100 rpm [1, 100 + 100 r/min]). d. Turn  MASTER  SWITCH  (9,  Figure  4-2)  to  450 cw position. CAUTION If  engine  oil  pressure  does  not  register  on  gauge  within five     seconds,     immediately     shut     down     engine     and determine    cause.          Refer     to     TROUBLESHOOTING (Section V). e. Push   engine   START   switch   (8,    Figure    4-2). When engine starts continue to hold START switch until EN-GINE     OIL     PRESSURE     gauge     (6,     Figure     4-2) registers pres-sure; then, release START switch. CAUTION If   compressor   oil   pressure   does   not   register   within   5 seconds, shut down engine, and determine cause.  Refer to TROUBLESHOOT-ING, (Section V). Table 6-1.  Table of Limits CHART MINIMUM MAXIMUM REPLACE- REF NO. DESCRIPTION INCHES INCHES MENT NO. (FIGURE) (MILLIMETERS) (MILLIMETERS) MAX CONTINUOUS BLEED VALVE SUBASSEMBLY 1 6-29 Orifice Screw Orifice diameter ........................ 0.030 0.033 0.035 (0.7620) (0.7620) (0.0889) 6-64