3304 DIRECT INJECTION VEHICULAR ENGINE
WITH SCROLL FUEL SYSTEM
TM 5-3805-258-24-1
SPECIFICATIONS
PISTONS AND RINGS
PISTONS AND PISTON RINGS
(1) TOP RING
(2) INTERMEDIATE RING
(3) OIL CONTROL RING
Part No.
9L893212W1707
9L893212W1708
“ “9L6934
Width of groove in piston for piston ring
. . .
. . .
(new).
3.188 ? 0.013 mm
—
—
(. 1255 * .0005 in.)
. . .
Thickness of piston ring (new)
. . .
3.137 f 0.013mm
—
—
(. 1235 * .0005 in.)
Clearance between groove and piston
. . .
. . .
0.051 ? 0.025 mm
ring (new)
—
—
(.0020 * .0010 in.)
Maximum permissible clearance
. . .
. . .
(worn).
0.15 mm
—
—
(.006 in.)
Clearance between ends of piston ring
when installed in a cylinder liner with a
0.822 * 0.191 mm
0.622 ? 0.191 mm
0.572 f 0,191 mm
bore size of 120.650 mm (4.7500 in.)
(.0245 * .0075 in.)
(.0245 i .0075 in.)
(.0225 * .0075 in.)
Increase in clearance between ends of
piston ring for each 0.03 mm. (.001 in.)
0.06 mm.
increase in cylinder liner bore size.
(.003 in,)
“Install piston ring with “UP’ side toward top of piston.
NOTE: 9L8932/2W1707 Top Ring (1) has the mark “UP-1”.
9L8932/2W1708 Intermediate Ring (2) has the mark “UP-2’.
“*Install 9L6934 Oil Control Ring (3) with the gap in the spring 16& away from the gap in the ring.
l “”’’Keystone” style piston rings and grooves in pistons. The 5P4612 KEYSTONE PISTON RING GROOVE GAUGE is necessary for
measuring these grooves. Put the pin end (A) of gauge “2’ in the groove at four places around the circumference. Do this to both grooves.
The fiat edge (B) of the gauge must be between grooves(1) and (2). If there is clearance between the flat edge (B) of the gauge and the
piston at all test locations, for both grmves, the piston is reusable. If the flat edge (B) is in contact with the piston, at any of the test
locations, the piston is not reusable. Install a new piston.
(4) Bore in piston for
pin . . . . . . 43.195 * 0.008 mm (1.7008 t .0003 in.)
Claarance between pin and bore
in piston . . . . . . . . . . . . . . . . . . 0.008 to 0.033 mm (.0003 to .0013 in.)
Maximum permissible clearance
(worn) . . . . . . . . . . . . . . 0.05 mm (.002 in.)
Pin
diameter . . . .
43.175 ~ 0.005 mm (1.6998 t .0002 in.)
NOTE: When installed in the engine, the “V” mark on top of the piston
must be in alignment with the’”V” mark on the cylinder block.
2-19
