TM  5-4930-227-14 CHAPTER   5 DIRECT   SUPPORT   AND   GENERAL   SUPPORT Section  I. 5-1.   Scope These instructions are published for the use of direct  support  and  general  support  maintenance personnel  maintaining  the  tank  and  pump  unit. They  provide  information  on  the  maintenance  of the  tank  and  pump  unit  which  is  beyond  the GENERAL scope  of  the  tools,  equipment,  personnel,  or  sup- plies  normally  available  to  using  organizations. 5-2.  Forms  and  Records DA  forms  and  records  used  for  equipment  main- tenance will be only those prescribed in TM 38- 750. Section  Il.  DESCRIPTION  AND  DATA 5-3.    Description c.  Engine  Overhaul  Data. For a complete description of the tank and pump Bore    _________________2    7/8    in. unit, refer to paragraph 1-4. Stroke   ________________   2   3/4   in. 5-4.  Tabulated    Data Displacement   _________   17.8   cu   in. a. General. This paragraph contains all tabu- Rotation    _____________Clockwise    (flywheel    end) lated   data   pertinent   to   direct   support   and Brake horsepower ________4.49 at 3,000 rpm general  support  maintenance  personnel. Spark   plug   gap   _______.030 b. Nut and Bolt Torque Data.  Refer  to  table Magneto   points   _________.0.0l5 5-1. Carburetor   ___________Idle   at   1,000-1,200   rpm Table 5-1. Nut and Bolt Torque Data d.  Engine  Repair  and  Replacement  Standards. Cylinder  head  screws  ______14-l8  ft-lb Table 5-2 lists the manufacturer’s sizes, toler- Oil  pan  screw  _______________  6-8  ft-lb Rod  cap  belt  _________  18-l8  ft-lb antes,  desired  clearances,  and  maximum  allowable Main  bearing  cap  belt  _____.l4-l8  ft-lb wear and clearances. Table 5-2. Repair and Replacement Standards. Component Crankshaft Diameter of journal Clearance to connecting rod Width of journal Connecting rod side clearance End play (cold) Piston Ring gap Ring side Clearance in grooves: Top ring 2nd and 3rd ring Oil  ring Manufacturer’s dimensions and   tolerances in   inches Desired clearance Min 1.000 1.000 Max 1.001 1.005 Min 0.007 0.006 0.002 0.012 0.002 0.001 0.0025 Max 0.002 0.013 0.004 0.022 0.0035 0.0025 0.004 0.002 0.013 0.004 0.022 0.0035 0.0025 0.004 5-1