Dodge RAM TRUCK 1500 1995 Service Manual page 978

mm — _ S J L ENGINE I - 1 3 7
FITTING
RINGS
(1) Measurement of end gaps;
(a) Measure piston ring gap 2 inches from bot­
tom of cylinder bore. An inverted piston can be
used to push the rings down to ensure positioning
rings squarely in the cylinder bore before measur­
ing.
(b) Insert feeler stock in the gap. Gap for com­
pression rings should be between 0.254-0.508 mm
(0.010-0.020 inch).. The oil ring gap should be
0.381-1.397 mm (0.015-0.055 inch).
(c) Rings with insufficient end gap may be prop­
erly filed to the correct dimension. Ends should be
stoned smooth after filing with Arkansas White
Stone. Rings with excess gaps should not be used.
(2) Install rings and confirm ring side clearance:
(a) Install oil rings being careful not to nick or
scratch the piston. Install the oil control rings ac­
cording to instructions in the package. It is not nec­
essary to use a tool to install the upper and lower
rails. Insert oil rail spacer first, then side rails.
(b) Install the second compression rings using In­
stallation Tbol 0-4184. The compression rings must
be installed with the identification mark face up
(toward top of piston) and chamfer facing down. An
identification mark on the ring is a drill point, a
stamped letter O, an oval depression or the word
TOP Figs. 15 and 17.
S E C O N D C O M P R E S S I O N R I N G
(BLACK CAST IRON)
CHAMFER
TWO
DOTS
J9009-46
m
Fig. 15 Second Compression Ring Identification—
Typical
(c) Using a ring installer, install the top compres­
sion ring with the chamfer facing up (Fig. 16). An
identification mark on the ring is a drill point, a
stamped letter O, an oval depression or the word
TOP facing up..
(d) Measure side clearance between piston ring
and ring land. Clearance should be 0.074-0.097 mm
(0.0029-0.0038 inch) for the compression rings. The
steel rail oil ring should be free in groove, but
should not exceed 0.246 mm (0.0097 inch) side
clearance.
(e) Pistons with insufficient or excessive side
clearance should be replaced.
TOP COMPRESSION RING
(GRAY IN COLOR)
J9009-48
Fig. 16 Top Compression Ring Identification-
Typical
CHAMFER TOP COMPRESSION
^ ^ ^ RING
1 ? ^JS^^B^M^P: N
SECOND
^ - C O M P R E S S I O N
mm
PISTON
J9409-37
Fig, T7 Compression Ring Chamfer Location-
Typical
(8) Arrange ring gaps 180° apart as shown in Fig.
18.
TOP COMPRESSION RING GAP
. UPPER OIL RING GAP
SPACER
. GAP
FRONT
. Of
ENGINE
2ND COMPRESSION RING GAP
LOWER OIL RAIL GAP
smm*77
Fig. 18 Proper Ring Installation
CONNECTING- ROD BEARINGS
Fit all rods on a bank until completed. DO NOT al­
ternate from one bank to another, because connecting
rods and pistons. are not interchangeable from one
bank to another.
The bearing caps are not interchangeable and
should be marked at removal to ensure correct as­
sembly.