TECHNICAL DATA -B.2 Manufacturing Data and Dimensions All     threads     used,     except     perhaps     on     proprietary equipment  are  Unified  Series  and  America  Pipe  series. The  crankshaft and pulley retaining setscrew are thread 7/8 in U.N.F. of T.P.I. The following data of clearances and tolerances are given   as   a   guide   for   personnel   engaged   upon   major overhauls  and  the  figures  are  those  used  in  the  factory for production methods. The    figure    quoted    in    the    dimensions    column represent the minimum and the maximum sizes to which parts may be accepted when new. The difference between these maximum and   minimum   figures   is   know   as   the   manufacturing tolerance     and     this     is     necessary     as     an     aid     to manufacturing   and   its   value   is   an   expression   of   the desired quality of manufacture. For   example,    where    the    outside    diameter    of   a crankshaft   main   journal   is   quoted   as   2.9985/2.999   in (76,16/76,18  mm)  then  the  manufacturing  tolerance  is 0.0005 in (0.0127 mm). During  the  overhaul  of  an  engine  it  is  reasonable  to expect   the   use   of   personal   initiave.      It   is   obviously uneconomical    to    return    worn    component    parts    into service to involve labour cost again at an early date. Cylinder Block Total Height of Cylinder Block between Top and Bottom Faces ...... ...... ...... ...... 17.367/17.375 in (441,12/441,33 mm) Parent Bore Dia.  for Cylinder Liner (Cast Iron) ...... 4.0615/4.0625 in (103,16/103,19 mm) Main Bearing Parent Bore Dia.    ...... ...... ...... 3.166/3.167 in (80,42/80,44 mm) Camshaft Bore Dia.  No.  1 for Bush (where fitted)   ... 2.1875/2.1887 in (55,56/55.59 mm) Camshaft Bearing Bush Internal Dia.  fitted... ...... 2.0000/2.0017 in (50.8/50.84 mm) Camshaft Bore Dia.  No.  1 ...... 2.00/2.001 in (50,80/50,83 mm) Camshaft Bore Dia.  No.  2 ...... ...... ...... 1.990/1.9918 in (50,55/50,59 mm) Camshaft Bore Dia.  No.  3 ...... ...... ...... 1.970/1.9718 in (50,04/50,08 mm) Cylinder Liners (Cast Iron) Type ...... ...... ...... ...... ...... Dry-Interference Fit Interference Fit of Liner  ...... ...... ...... ...... 0.003/0.005 in (0,08/0,13 mm) Inside Dia.  of Liner after finish boring ...... ...... 3.877/3.878 in (98,48/98.50 mm) Height of Liner above Cylinder Block Face.... ...... 0.028/0.035 in (0.71/0.89 mm) Maximum Oversize (Rebore) ...... ...... ...... +0.030 in (0,76 mm) Overall Leneth of Liner    ...... ...... ...... ...... 9.005/9.015 in (228.7/229,0 mm) Pistons Type ...... ...... ...... ...... ...... Cavity in Crown Overall Height (Skirt to Crown)    ...... ...... ...... 4.767 in (121.08 mm) Piston Skirt Dia.  (Across Thrust) ..... ...... ...... 3.8699/3.8707 in (98,29/98,32 mm) Piston Crown Dia.  (Across Thrust) .. ...... ...... 3.8508/3.8528 in (97.80/97.85 mm) Piston Height in Relation to Cylinder Block Top Face (prior to Engine Nos.  236U135765 or 236U147150L) ...... ...... ...... ...... 0.003/0.010 in (0,08/0,25 mm) ABOVE Piston Height in Relation to Cylinder Block Top Face (commencing Engine Nos.  2361'135765 or 236U1147150L ...... ...... ...... ...... 0.016/0.024 in (0.41/0.61 mm) ABOVE Bore Dia.  for Gudgeon Pin.. ...... ...... ...... 1.37485/1.37505 in (34.92/34.93 mm) Compression Ring Groove Width-Numbers 1,  2,.  3... 0.0057 0.0967 in (2.43/2.46 mm) Scraper Ring Groove Width-Numbers 4 and 5 ...... 0.2525 0.2535 in (6.41/6.44 mm) Weight of Piston ...... ...... ...... ...... 2 lb 91/8, oz.  -    1/4 oz (1.165 kg - 7 g)