Dodge Viper SRT-10 (ZB). Manual — part 179
REMOVAL
NOTE: Pistons and connecting rods are to be
removed as an assembly from top of cylinder block.
(1) Remove cylinder heads (Refer to 9 - ENGINE/
CYLINDER HEAD - REMOVAL).
(2) Remove oil pan (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PAN - REMOVAL).
(3) Remove the oil pump pick up tube and the
crankshaft oil scraper (Fig. 90) and (Fig. 91).
CAUTION: DO NOT use a number stamp or a punch
to mark connecting rods. Damage to connecting
rod could occur.
(4) Inspect connecting rods and connecting rod
caps for cylinder identification. Identify them if nec-
essary using a permanent ink or paint marker (Fig.
92).
CAUTION: Care must be taken not to damage the
fractured rod and cap joint surfaces, as engine
damage may occur.
NOTE: Do not reuse connecting rod bolts.
(5) Remove connecting rod bolts and cap. Push
each piston and rod assembly out the block.
NOTE: Be careful not to nick crankshaft journals.
(6) After removal, install bearing cap on the mat-
ing rod.
Fig. 90 Oil Pick Up Tube
1 - BOLT
2 - OIL PUMP PICK UP TUBE
3 - NUT
4 - O RING
Fig. 91 Crankshaft Oil Scraper
1 - NUT(S)
2 - CRANKSHAFT OIL SCRAPER
Fig. 92 Connecting Rod to Cylinder Identification
1 - CYLINDER NUMBER
9 - 58
ENGINE
ZB
PISTON & CONNECTING ROD (Continued)
INSPECTION
CONNECTING ROD
(1) Check the connecting rods for twist or bend.
(2) Check the condition of the large end. Use an oil
stone to remove any nicks and burrs.
(3) Check the condition of the pin bore in the small
end of the connecting rod. Use an oil stone to remove
all nicks and burrs.
PISTON PIN
(1) Inspect for free rotation of the piston pin in the
piston.
PISTON
(1) Inspect all piston surfaces for nicks and scuffs.
(2) Inspect piston and ring grooves for wear.
INSTALLATION
NOTE: Pistons and connecting rods are serviced as
an assembly. Left bank pistons are labeled “ODD”.
Right bank pistons are labeled “EVEN”.
(1) Install piston rings (Refer to 9 - ENGINE/EN-
GINE BLOCK/PISTON RINGS - INSTALLATION).
NOTE: Before installing pistons, and connecting
rod assemblies into the bore, be sure that compres-
sion ring gaps are staggered so that neither is in
line with oil ring rail gap. Before installing the ring
compressor, make sure the oil ring expander ends
are butted and the rail gaps located as shown in
(Fig. 101).
(2) Immerse the piston head and rings in clean
engine oil, slide the ring compressor, over the piston.
Be sure position of rings does not change dur-
ing this operation.
(3) Rotate crankshaft so that the connecting rod
journal is at the bottom of it’s stroke and in the cen-
ter of the cylinder bore.
(4) The arrow on top of piston must be pointing
toward front of engine (Fig. 93).
(5) Install new connecting rod bearing in connect-
ing rod and rod cap.
(6) Install piston assembly from the top of the
block (Fig. 94). Tap the piston down in cylinder bore,
using a hammer handle. Guide the rod over the
crankshaft journal.
(7) Install rod cap. Install NEW connecting rod
bolts. Bolt threads should be oiled with engine oil.
Torque connecting rod bolts to 68 N·m (50 ft. lbs.).
(8) Install
the
crankshaft
oil
scraper.
Torque
crankshaft oil scraper nuts to 23 N·m (200 in. lbs.)
(Fig. 91).
(9) Install oil pump pick up tube using a new
o-ring. Torque 1/4–20 bolt to 11 N·m (95 in. lbs.).
Torque 5/16–18 nut to 23 N·m (200 in. lbs.) (Fig. 90).
(10) Install oil pan (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PAN - INSTALLATION).
(11) Install cylinder heads (Refer to 9 - ENGINE/
CYLINDER HEAD - INSTALLATION).
Fig. 93 Piston I.D. Arrows
1 - ARROWS MUST FACE TOWARD FRONT OF ENGINE
Fig. 94 Piston and Connecting Rod—Installation
ZB
ENGINE
9 - 59
PISTON & CONNECTING ROD (Continued)
PISTON RINGS
STANDARD PROCEDURE - MEASURING
PISTON RING CLEARANCES
(1) Wipe cylinder bore clean. Insert ring and push
down with piston to ensure it is square in bore. The
ring gap measurement must be made with the ring
positioning at least 12 mm (0.50 in.) from bottom of
cylinder bore. Check gap with feeler gauge (1) (Fig.
95). (Refer to 9 - ENGINE - SPECIFICATIONS) for
piston ring specifications.
(2) Check piston ring side clearance (Fig. 96).
(Refer to 9 - ENGINE - SPECIFICATIONS) for pis-
ton ring specifications.
REMOVAL
(1) Using a suitable ring expander, remove upper
and intermediate piston rings (Fig. 97).
(2) Remove the upper oil ring side rail, lower oil
ring side rail and then oil ring expander from piston.
(3) Clean ring grooves of any carbon deposits.
INSTALLATION
The No. 1 (1) and No. 2 (2) piston rings have a dif-
ferent cross section. Install rings with manufacturers
I.D. mark facing up, to the top of the piston (Fig. 98).
Fig. 95 Measuring Piston Ring End Gap
1 - FEELER GAUGE
Fig. 96 Measuring Piston Ring Side Clearance
1 - PISTON RING
2 - FEELER GAUGE
3 - RING GROOVE
Fig. 97 Piston Rings—Removing and Installing
Fig. 98 Piston Ring Installation
1 - NO. 1 PISTON RING
2 - NO. 2 PISTON RING
3 - SIDE RAIL
4 - OIL RING
5 - OIL RING EXPANDER
9 - 60
ENGINE
ZB
CAUTION: Install piston rings in the following
order:
• Oil ring expander
• Lower oil ring side rail
• Upper oil ring side rail
• No. 2 intermediate piston ring
• No. 1 upper piston ring
(1) Install oil ring expander.
(2) Install the lower oil ring side rail by placing
one end between the piston ring groove and the
expander. Hold end firmly and press down the por-
tion to be installed until side rail (1) is in position.
Do not use a piston ring expander. (Fig. 99).
(3) Install upper oil ring side rail.
(4) Install No. 2 piston ring and then No. 1 piston
ring (Fig. 100).
(5) Position piston ring end gaps as shown (Fig.
101).
(6) Position oil ring expander gap at least 45° from
the side rail gaps but not on the piston pin center or
on the thrust direction. Staggering ring gap is impor-
tant for oil control.
CONNECTING ROD BEARINGS
DESCRIPTION
The bearing caps are not interchangeable and
should be paint marked or scribed at removal to
insure correct assembly.
The bearing shells must be installed so that the
tangs are in the machined grooves in the rods and
caps.
Limits of taper or out-of-round on any crankshaft
journals should be held to 0.013 mm (0.0005 in.).
Bearings are available in 0.025 mm (0.001 in.), 0.051
mm (0.002 in.), 0.076 mm (0.003 in.), 0.254 mm
(0.010 in.) and 0.305 mm (0.012 in.) undersize.
Install the bearings in pairs. Do not use a new
bearing half with an old bearing half. Do not
file the rods or bearing caps.
STANDARD PROCEDURE
CONNECTING ROD BEARING - FITTING
Fit all rods on one bank until complete. Do not
alternate from one bank to another, because when
the rods are assembled to pistons correctly, they are
not interchangeable from one bank to another.
The bearing caps are not interchangeable and
should be marked at removal to insure correct
assembly.
Fig. 99 Side Rail—Installation
1 - SIDE RAIL END
Fig. 100 Upper and Intermediate Rings—Installation
Fig. 101 Piston Ring End Gap Position
1 - GAP OF LOWER SIDE RAIL
2 - NO. 1 RING GAP
3 - GAP OF UPPER SIDE RAIL
4 - NO. 2 RING GAP AND SPACER EXPANDER GAP
ZB
ENGINE
9 - 61
PISTON RINGS (Continued)
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