Dodge RAM TRUCK 1500 1995 Service Manual page 1013

I - 1 7 2 S J L (DIESEL) ENGINE
DISASSEMBLE
(1) Remove the retainer rings from the piston (Fig.
IX
(2) Remove the piston pin. Heating the piston is
not required.
(3) Remove the piston rings (Fig. 1).
— ^ J9i 09-62
Fig. 1 Retainer Rings
CLEANING
CAUTION; DO NOT use bead blast to clean the pis­
tons. DO NOT clean the pistons and rods In an acid
tank.
Soak the pistons in cold parts cleaner. Soaking the
pistons overnight will usually loosen the carbon de­
posits.
Wash the pistons and rods in a strong solution of
laundry detergent and hot water.
Clean the remaining deposits from the ring grooves
with the square end of a broken ring. DO NOT use a
ring groove cleaner and be sure not to scratch the
ring sealing surface in the piston groove.
Wash the pistons again in a detergent solution or
solvent.
Rinse the pistons. Use compressed air to dry.
INSPECTION
Inspect the rod journals for deep scratches, indica­
tion of overheating and other damage.
Inspect the pistons for damage and excessive wear.
Check top of the piston, ring grooves, skirt and pin
bore.
Measure the piston skirt diameter (Fig. 2). If the
piston is out of limits, replace the piston.
The upper groove only needs to be inspected for
damage.
Use a new piston ring to measure the clearance in
the intermediate ring groove (Fig. 3). If the clearance
of the intermediate ring exceeds 0.152 mm (0.006
inch), replace the piston.
J9109-63
Fig. 2 Piston Skirt Diameter
Use a new oil ring to measure the clearance in the
oil groove (Fig. 3). I f the clearance exceeds 0.127 mm
(0.005 inch), replace the piston.
PISTON
J9109-64
Fig. 3 Intermediate and Oil Ring Clearances
Measure the pin bore (Fig. 4). The maximum diam­
eter is 40.025 mm (1.5758 inch). If the bore is over
limits, replace the piston.
PISTON
J9109-65
Fig. 4 Piston Pin Bore
Inspect the piston pin for nicks, gouges and exces­
sive wear.
Measure the pin diameter (Fig. 5). The minimum
diameter is
39.990
mm (1.5744 inch). If the diameter
is out of limits, replace the pin.
Inspect the rod for damage and wear. The I-Beam
section of the connecting rod cannot have dents or