Dodge Viper SRT-10 (ZB). Manual - part 174

(5) Compress valve springs with a valve spring

compressor. Install retaining locks and release tool.

(6) If valves and/or seats have been reground,

measure valve tip height (A) (Fig. 47). Make
sure measurements are taken from cylinder
head surface to the top of valve stem. If valve tip
height is greater than 52.96 mm (2.085 in.), grind the
valve tip until within specifications.

(7)

valves

and/or

seats

have

been

reground, measure installed height of springs
(B) (Fig. 47). Make sure measurements are
taken from top of spring seat to the bottom sur-
face of valve spring retainer. If height is greater
than 44.45 mm (1.75 in.), install a 0.794 mm (.031
in.) spacer in head counter-bore under the valve
spring seat to bring spring height back to 43.69 -
44.45 mm (1.72 - 1.75 in.).

INTAKE/EXHAUST - VALVES/
SEATS/GUIDES

STANDARD PROCEDURE - VALVE AND VALVE
SEAT - REFACING

The intake and exhaust valves have a 44.5° - 45°

face angle (1). The valve seats (2) have a 44.5° - 45°
face angle.

Inspect the remaining margin after the valves are

refaced. (Refer to 9 - ENGINE - SPECIFICATIONS).

VALVE SEATS

CAUTION: Do not un-shroud valves during valve
seat refacing (Fig. 49).

(1) When refacing valve seats, it is important that

the correct size valve guide pilot be used for reseat-
ing stones. A true and complete surface must be
obtained.

(2) Measure the concentricity of valve seat using a

dial indicator. Total runout should not exceed 0.051
mm (0.002 in.) total indicator reading.

(3) Inspect the valve seat with Prussian blue to

determine where the valve contacts the seat. To do
this, coat valve seat LIGHTLYwith Prussian blue
then set valve in place. Rotate the valve with light
pressure. If the blue is transferred to the center of
valve face, contact is satisfactory. If the blue is trans-
ferred to top edge of valve face, lower valve seat with

Fig. 47 Measuring Valve Tip Height and Valve

Spring Installed Height

1 - VALVE SEAL
2 - VALVE SPRING SEAT
3 - CYLINDER HEAD SURFACE

Fig. 48 Valve Face and Seat

1 - SEAT WIDTH
2 - FACE ANGLE
3 - SEAT ANGLE
4 - SEAT CONTACT AREA

Fig. 49 Valve Seat Refacing

1 - REFACING STONE MUST NOT CUT INTO VALVE SHROUD
2 - STONE
3 - PILOT
4 - SEAT
5 - SHROUD

9 - 38

ENGINE

VALVE SPRINGS/SEALS (Continued)

a 30° stone. If the blue is transferred to the bottom
edge of valve face raise valve seat with a 75° stone.

NOTE: Valve seats which are worn or burned can
be reworked, provided that correct angle and seat
width are maintained. Otherwise cylinder head must
be replaced.

(4) When seat is properly positioned the width of

both seats should be 1.02 - 1.52 mm (0.040 - 0.060
in.) (Fig. 48).

INSPECTION

Valve

(1) Clean

valves

thoroughly

and

discard

any

burned, bent, warped, and cracked valves.

(2) Measure valve stems for wear (Refer to 9 -

ENGINE - SPECIFICATIONS).

NOTE: Valve stems are chrome plated and should
not be polished (Fig. 50).

Valve Guide

(1) Remove carbon and varnish deposits from

inside of valve guides with a reliable guide cleaner.

(2) Measure valve stem guide clearance as follows:
1. Install valve into cylinder head so it is 14 mm

(0.551 in.) off the valve seat. A small piece of hose
may be used to hold valve in place.

2. Attach Special Tool C-3339, dial indicator to cyl-

inder head and set it at right angle of valve stem
being measured (Fig. 51).

3. Move valve to and from the indicator. (Refer to

9 - ENGINE - SPECIFICATIONS) for valve guide
specifications. If guides are out of specifications,
ream to next oversize.

(3) Ream the guides for valves with oversized

stems if dial indicator reading is excessive or if the
stems are scuffed or scored.

(4) Service valves with oversize stems and over

size seals are available in 0.15 mm (0.005 in.) and
0.40 mm (0.015 in.) oversize.

NOTE: Oversize seals must be used with oversize
valves.

(5) Select the correct size reamer to accommodate

the oversize valve stem. Refer to Valve Guide Over-
size Chart.

(6) Slowly turn reamer by hand and clean guide

thoroughly before installing new valve. Do not
attempt to ream the valve guides from standard
directly to 0.40 mm (0.015 in.). Use a step proce-
dure of 0.15 mm (0.005 in.) to 0.40 mm (0.015
in.), so the valve guides may be reamed true in
relation to the valve seat. After reaming guides,
the seat runout should be measured and resur-
faced if necessary. See Refacing Valves and
Valve Seats.

NOTE: Replace cylinder head if guide does not
clean up with 0.40 mm (0.015 inch) oversize reamer,
or if guide is loose in cylinder head.

VALVE GUIDE OVERSIZE CHART

Valve Guide

Reamer Over-

size

Valve Guide Size

0.15 mm (0.005
in.)

8.077–8.103

(0.318–0.319
in.)

0.40 mm (0.015
in.)

8.331–8.357

(0.328–0.329
in.)

Fig. 50 Intake and Exhaust Valve - Typical

1 - FACE
2 - STEM
3 - VALVE SPRING RETAINER LOCK GROOVES

Fig. 51 Measuring Valve Guide Wear

ENGINE

9 - 39

INTAKE/EXHAUST - VALVES/SEATS/GUIDES (Continued)

TIMING CHAIN COVER

REMOVAL

(1) Open trunk lid. Remove battery cover. Discon-

nect negative battery cable.

(2) Disconnect throttle body air inlet hose, remove

air cleaner housing assembly (Refer to 9 - ENGINE/
AIR INTAKE SYSTEM - REMOVAL).

(3) Drain cooling system (Refer to 7 - COOLING/

ENGINE - STANDARD PROCEDURE - DRAINING
COOLING SYSTEM).

(4) Remove upper and lower radiator hoses.
(5) Remove front strut tower to tower brace (Refer

to 23 - BODY/EXTERIOR/FRONT STRUT TOWER
TO TOWER BRACE - REMOVAL).

(6) Remove accessory drive belt (Refer to 7 -

COOLING/ACCESSORY

DRIVE/DRIVE

BELTS

REMOVAL).

(7) Remove power steering pump mounting bolts.

Reposition power steering pump. Do not disconnect
power steering lines.

(8) Disconnect coolant bottle inlet hose at thermo-

stat housing.

(9) Disconnect engine coolant temperature (ECT)

sensor connector.

(10) Disconnect generator wiring. Remove generator.

NOTE: Do Not remove the camshaft position sensor.

(11) Disconnect the camshaft sensor harness con-

nector.

(12) Remove crankshaft pulley and damper (Refer

ENGINE/ENGINE

BLOCK/VIBRATION

DAMPER - REMOVAL).

(13) Disconnect heater hose.
(14) Disconnect oil cooler line using Special Tool

9005 (Refer to 9 - ENGINE/LUBRICATION/OIL
COOLER & LINES - STANDARD PROCEDURE).

(15) Remove A/C compressor mounting bolts. Repo-

sition A/C compressor. Do not disconnect A/C lines.

(16) Raise vehicle on hoist.
(17) Drain engine oil. Remove oil pan (Refer to 9 -

ENGINE/LUBRICATION/OIL PAN - REMOVAL).

(18) Remove oil pump pick up tube (Fig. 52).
(19) Lower vehicle.
(20) Remove A/C compressor mounting bracket

(Fig. 53).

(21) Remove timing chain cover bolts in reverse

order of tightening sequence (Fig. 55).

(22) Remove timing chain cover (Fig. 53).

INSTALLATION

CAUTION: Do not use a metal scraper to clean alu-
minum sealing surfaces, as damage to surfaces
may occur. Use only a plastic scraper and Mopar

Brake Parts Cleaner or the equivalent

(1) Be sure mating surfaces of chain case cover

and cylinder block are clean and free from burrs.
Crankshaft oil seal must be removed to insure cor-
rect oil pump engagement.

(2) Replace timing chain cover gasket (Fig. 54).

Fig. 52 Oil Pick Up Tube

1 - BOLT
2 - OIL PUMP PICK UP TUBE
3 - NUT
4 - O RING

Fig. 53 Timing Chain Cover & A/C Compressor Bracket

1 - WIRING CLIP
2 - A/C COMPRESSOR BRACKET

9 - 40

ENGINE

(3) Position the oil pump inner rotor mating flats

in the same position as the crankshaft drive flats.

(4) Install timing chain cover onto crankshaft.

Ensure the oil pump is engaged on the crankshaft
correctly or severe damage may result.

(5) Hand start bolts #1 and #2 (Fig. 55).
(6) Loosely

install

A/C

compressor

mounting

bracket (Fig. 53).

(7) Hand start remaining timing chain cover bolts

(Fig. 55).

(8) Torque timing chain cover bolts in the sequence

shown in (Fig. 55) to 23 N·m (200 in. lbs.).

(9) Torque A/C compressor mounting bracket bolts

to 23 N·m (200 in. lbs.).

(10) Install crankshaft oil seal (Refer to 9 -

ENGINE/ENGINE

BLOCK/CRANKSHAFT

OIL

SEAL - FRONT - INSTALLATION).

(11) Raise vehicle on hoist.
(12) 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. 52).

(13) Install oil pan and drain plug (Refer to 9 -

ENGINE/LUBRICATION/OIL PAN - INSTALLATION).

(14) Lower vehicle.
(15) Install A/C compressor mounting bolts. Torque

bolts to 23 N·m (200 in. lbs.).

(16) Connect oil cooler line (Refer to 9 - ENGINE/

LUBRICATION/OIL COOLER & LINES - STAN-
DARD PROCEDURE).

(17) Connect heater hose.

(18) Install crankshaft damper and pulley (Refer

ENGINE/ENGINE

BLOCK/VIBRATION

DAMPER - INSTALLATION).

(19) Connect coolant bottle inlet hose at thermo-

stat housing.

(20) Install generator. Connect electrical connectors.
(21) Connect the camshaft position sensor wiring

harness connector.

(22) Connect engine coolant temperature (ECT)

sensor wiring harness connector.

(23) Install power steering pump mounting bolts.
(24) Install accessory drive belt (Refer to 7 -

COOLING/ACCESSORY

DRIVE/DRIVE

BELTS

INSTALLATION).

(25) Install upper and lower radiator hoses.
(26) Install front strut tower to tower brace (Refer

to 23 - BODY/EXTERIOR/FRONT STRUT TOWER
TO TOWER BRACE - INSTALLATION).

(27) Install air cleaner housing assembly, connect

throttle body air inlet hose (Refer to 9 - ENGINE/
AIR INTAKE SYSTEM - INSTALLATION).

(28) Install NEW oil filter.
(29) Fill engine crankcase with proper oil to cor-

rect level.

(30) Fill cooling system (Refer to 7 - COOLING/

ENGINE - STANDARD PROCEDURE - FILLING
COOLING SYSTEM).

(31) Connect negative battery cable. Install battery

cover. Close trunk lid.

Fig. 54 Timing Chain Cover Gasket

1 - TIMING CHAIN COVER
2 - GASKET
3 - OIL PUMP

Fig. 55 Timing Chain Cover Tightening Sequence

* = 3 INCH BOLTS
** = 4.5 INCH BOLTS

ENGINE

9 - 41

TIMING CHAIN COVER (Continued)

Content .. 172 173 174 175 ..