TM 10-3930-653-14&P (3)  Oil level Essential   points   when   checking   the   oil   level   standard quantity 7.0 liters (1.5 G.B. gal, 1.9 U.S. gal). Volume from upper end to lower end 0.5 liter (0.11 G.B. gal, 0.13 U.S. gal). 1. The oil level should be kept at the high level mark. 2. Start the engine and keep it idling for five minutes to let   the   oil   circulate   through   the   torque   converter valves and pressurized oil circuit. 3. Stop   the   engine,   immediately   take   out   the   level gauge  and  confirm  that  the  oil  on  the  gauge  shows the standard level. 4. Add    fresh    oil    up    to    the    high    level    mark    when necessary. 5. If  there  is  too  much  oil,  remove  the  drain  plug  and discard oil down to the standard level. Fig. 4-228.  Oil Level NOTE Neglecting to maintain the correct oil level will cause the following trouble. i)  When the oil level is too low Air  will  enter  the  pressurized  oil  circuit,  the  control valve  will  generate  an  abnormal  noise,  and  the  Tor- Co-Matic^®   transmission   performance   will   be   down graded  because  normal  pressure  will  not  be  applied to the torque converter and clutches. (4) Daily or weekly checking points Checking  the  following  points  at  least  once  a  week  will aid in the detection of the cause of trouble. 1. Oil leakage from the transmission. 2. Oil leakage from the oil cooler hose joints. 3. Abnormal noise when idling. 4. Change of the degree of shock when shifting. ii)  When the oil level is too high The  oil  will  be  agitated  by  the  gears  and  froth.    Oil leakage  and  agitation  loss  will  down  grade  the  Tor- Co-Matic^® transmission performance. 5. Oil surface condition. 6. Unusual odor of oil. 7. Dirty oil. 8. Dirt in the air breather. 4-144