TM 5-3895-382-24
Illustration 46
Piston and rings
NOTE:
The word "Front" or an arrow which is marked on
the piston crown must be toward the front of the
engine. If the piston crown is not marked, put the
narrowest side of the piston crater toward the
side of the engine with the fuel injection pump.
The shortest distance between the edge of the
piston crater and the edge of the piston is the
narrowest side of the piston crater.
NOTE:
Be sure that the ring end gaps of all the piston
rings have 120 degrees spacing from each other.
NOTE:
Refer
to
Systems
Operation,
"General
Information" for the location of the serial number.
Naturally Aspirated Engines
(1)
Width of groove in piston for top
ring............................................................... 2.57 to 2.59 mm
(.101 to .102 inch)
Thickness of top ring ........................................... 2.48 to 2.49 mm
(.097 to .098 inch)
Clearance between groove and piston
ring........................................................................... 0.08 to 0.11 mm
(.003 to .004 inch)
Clearance between the ends of the top ring with a cylinder liner
without any wear .................................................. 0.40 to 0.85 mm
(.016 to .033 inch)
(2)
Width of groove in piston for intermediate
ring .............................2.55 to 2.57 mm (.100 to .101 inch)
Thickness of intermediate ring............................ 2.48 to 2.49 mm
(.097 to .098 inch)
Clearance between groove and intermediate
ring........................................................................... 0.06 to 0.09 mm
(.002 to .003 inch)
Clearance between the ends of the intermediate ring
with a cylinder liner without any wear ............... 0.30 to 0.76 mm
(.012 to .030 inch)
(3)
Width of groove in piston for oil control
ring ..........................................................4.030 to 4.060 mm
(.1587 to .1598 inch)
Thickness of oil control ring ............................3.980 to 3.990 mm
(.1566 to .1571 inch)
Clearance between groove and oil control
ring........................................................................... 0.04 to 0.08 mm
(.002 to .003 inch)
Clearance between the ends of oil control ring with a
cylinder liner without any wear ........................... 0.38 to 0.84 mm
(.015 to .033 inch)
(4)
Diameter of new piston pin .............34.920 to 34.925 mm
(1.3748 to 1.3750 inch)
Bore in piston for pin ....................................34.928 to 34.934 mm
(1.3751 to 1.3754 inch)
Piston height above cylinder block
(not shown) ........................................................... 0.14 to 0.36 mm
(.005 to .014 inch)
Turbocharged Engines
(1)
Shape of groove in piston for top ring ......................Taper
Shape of top ring .....................................................................Taper
Clearance between the ends of top ring in a cylinder liner
without any wear .................................................. 0.35 to 0.75 mm
(.014 to .030 inch)
(2)
Width of groove in piston for intermediate
ring .............................................................. 2.56 to 2.58 mm
(.101 to .102 inch)
Thickness of intermediate ring ........................... 2.48 to 2.49 mm
(.097 to .098 inch)
Clearance between groove and intermediate
ring........................................................................... 0.07 to 0.11 mm
(.003 to .004 inch)
Clearance between the ends of an intermediate
ring in a cylinder liner without any
wear ........................................................................ 0.30 to 0.76 mm
(.012 to .030 inch)
(3)
Width of groove in piston for oil control
ring ..........................................................4.040 to 4.060 mm
(.1591 to .1598 inch)
Thickness of oil control ring ................................ 3.98 to 3.99 mm
(.156 to .157 inch)
Clearance between groove and oil control
ring........................................................................... 0.05 to 0.08 mm
(.002 to .003 inch)
5-34
