TM 10-3930-653-14&P 4-1-3-3. IGNITION SYSTEM (1) CHECKING BATTERY WARNING The  electrolyte  in  the  battery  is  a  sulfuric  acid  solution. Be careful not to drip electrolyte on you or equipment.  If electrolyte spills on you, splash affected areas with water to flush electrolyte.  Get medical attention at once. CAUTION Never allow flame or sparks near the battery filler holes. Explosive hydrogen gas may be present. Engine must be shut down when filler ports are open. Check the electrolyte level in each battery cell. Permissible value Fully charged value (at 20°C, 68°F) Frigid Over 1.22 1.28 climates Tropical Over 1.18 1.23 climates Other Over 1.20 1.26 climates Clean the top of battery and terminals with a solution of baking soda.  The top of the battery must be clean to prevent   current   leakage   between   terminals   and   from positive terminal to hold-down clamp. In addition to current leakage, prolonged accumulation of acid   and   dirt   on   the   top   of   the   battery   may   cause corrosion of straps.  After tightening terminals, coat them with petrolatum (vaseline) to protect them from corrosion. (1) Unscrew each filler cap and inspect fluid level.  If the  fluid  is  low.    add  distilled  water  to  bring  the  level  up approximately  10  to  20  mm  (0.39  to  0.79  in)  above  the plates.  Do not overfill. (2) Measure the specific gravity of battery electrolyte before adding distilled water. (2) CHECKING DISTRIBUTOR BREAKER POINT Fig.  4-7.  Checking Distributor Point Gap Remove     distributor     cap     and     inspect     points     for excessive burning or pitting. Replace points if necessary.    Use  a  point  file  to  clean  contact  area  and remove  scale  from  points.    Adjust  distributor  point  gap. Filing  is  for  cleaning  purposes  only.    Do  not  attempt  to remove  all  roughness.   Adjust  distributor  dwell  angle  on all engines. Distributor point gap: 0.45 to 0.55 mm (0.018 to 0.022 in) Dwell angle: 49° to 55° (3) CHECKING AND ADJUSTING IGNITION TIMING With   distributor   vacuum   line   disconnected   and   lift truck operating at normal idle speed or below, set ignition timing. The timing can be observed  by  the  stationary  pointer at front cover and the grooves on crankshaft pulley with a device  called  a  stroboscopic  light  (also  referred  to  as  a timing light). Note that the pulley groove is graduated 5° per scale division in terms of the crank angle.  The top dead center is    located    to    the    extreme    left    as    viewed    from    the inspector’s side. 4 - 11