Chrysler RG Voyager. Manual - part 950

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
a 15 degree stone. If the blue is transferred to the
bottom edge of valve face raise valve seat with a 65
degrees 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

intake and exhaust seats should be 1.50–2.00 mm
(0.059–0.078 in.) (Fig. 28).

(5) After grinding the valve seats or faces, install

the valve in cylinder head and check valve installed

height by measuring from valve tip to spring seat
(Fig. 32). Remove valve from cylinder head and grind
valve tip until within specifications. Check valve tip
for scoring. The tip chamfer should be reground (if
necessary) to prevent seal damage when the valve is
installed.

(6) Check the valve spring installed height after

refacing the valve and seat (Fig. 32).

If valves and/or seats are reground, measure

the installed height of springs (Fig. 32), make
sure measurements are taken from top of
spring seat to the bottom surface of spring
retainer. If height is greater than specifica-
tions, install a 0.794 mm (0.0312 in.) spacer in
head counterbore to bring spring height back
within specifications.

Fig. 28 VALVE FACE AND SEAT

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

Fig. 29 Valve Margin

1 - VALVE FACE
2 - VALVE MARGIN

Fig. 30 Refacing Valve Seats

1 - REFACING STONE MUST NOT CUT INTO CYLINDER HEAD
2 - STONE
3 - PILOT
4 - SEAT

Fig. 31 Measurement of Valve Seat Runout

1 - DIAL INDICATOR

ENGINE 3.3/3.8L

9 - 109

INTAKE/EXHAUST VALVES & SEATS (Continued)

REMOVAL

(1) With cylinder head removed, compress valve

springs

using

Valve

Spring

Compressor

Tool

C-3422-D with adapter 8464 (Refer to 9 - ENGINE -
SPECIAL TOOLS).

(2) Remove valve retaining locks.
(3) Slowly

release

valve

spring

compressor.

Remove valve spring retainer, valve spring, and valve
stem seal.

(4) Before removing valves, remove any burrs

from valve stem lock grooves to prevent dam-
age to the valve guides. Identify valves to insure
installation in original location.

CLEANING

(1) Clean

all

valves

thoroughly

and

discard

burned, warped and cracked valves.

INSPECTION

VALVES

(1) Clean and inspect valves thoroughly. Replace

burned, warped and cracked valves.

(2) Measure valve stems for wear (Fig. 33). For

valve specifications, (Refer to 9 - ENGINE - SPECI-
FICATIONS).

NOTE: Valve stems are chrome plated and should
not be polished (Fig. 33).

VALVE GUIDES

(1) Remove carbon and varnish deposits from

inside of valve guides with a reliable guide cleaner.

(2) Measure valve stem-to-guide clearance as fol-

lows:

(3) Install valve into cylinder head so it is 15 mm

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

(4) Attach dial indicator Tool C-3339 to cylinder

head and set it at right angle of valve stem being
measured (Fig. 34).

(5) Move valve to and from the indicator. For cler-

ance specifications, (Refer to 9 - ENGINE - SPECIFI-
CATIONS).

NOTE: Replace cylinder head if stem-to-guide clear-
ance exceeds specifications, or if guide is loose in
cylinder head.

Fig. 32 Checking Valve and Spring Installed Height

1 - SPRING RETAINER
2 - VALVE INSTALLED HEIGHT* - 48.1–49.7 mm (1.89–1.95 in.)
3 - CYINDER HEAD SURFACE
4 - SPRING INSTALLED HEIGHT* - 41.1–42.7 mm (1.61–1.68 in.)

*(MEASURED FROM TOP OF SPRING SEAT)

Fig. 33 Intake and Exhaust Valves

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

Fig. 34 Measuring Valve Guide Wear - Typical

9 - 110

ENGINE 3.3/3.8L

INTAKE/EXHAUST VALVES & SEATS (Continued)

INSTALLATION

(1) Coat valve stems with clean engine oil and

insert them in cylinder head.

(2) Install valve spring seat on head (Fig. 36).
(3) Install new seals on all valve stems and over

valve guides (Fig. 36). Install valve springs and valve
retainers (Fig. 36).

(4) Install

the

valve

springs.

(Refer

ENGINE/CYLINDER

HEAD/VALVE

SPRINGS

INSTALLATION)

VALVE SPRINGS

DESCRIPTION

There are two interchangeable, floating (spring

rotates during operation), valve spring designs. Type
A may be identified by the counterclockwise (spring
spirals down and to the left) appearance, And Type B
may be identified by the clockwise (spring spirals
down and to the right) appearance. Both of the valve
springs are a bee-hive shaped design but have differ-
ent specifications (Fig. 35). The springs are seated on
a steel washer on the cylinder head with retainers
and locks retaining the springs (Fig. 36). The springs

are installed with the smaller diameter against
spring retainer (Fig. 35).

Fig. 36 VALVE COMPONENTS

1 - VALVE LOCKS

5 - SPRING SEATS

2 - RETAINERS

6 - CYLINDER HEAD

3 - VALVE SPRINGS

7 - VALVE - EXHAUST

4 - VALVE STEM SEALS

8 - VALVE - INTAKE

Fig. 35 Valve Spring - Type A

1 - VALVE SPRING (TOP - SMALLER DIAMETER)

ENGINE 3.3/3.8L

9 - 111

INTAKE/EXHAUST VALVES & SEATS (Continued)

OPERATION

The valve spring returns the valve against its seat

for a positive seal of the combustion chamber.

REMOVAL

REMOVAL - CYLINDER HEAD OFF

(1) With the cylinder head on a bench, position

Special Tool C-3422-D with 8464 Adapter on the
valve and spring retainer (Fig. 37).

(2) Compress the spring only enough to remove the

valve retainer locks.

(3) Slowly release the spring tension and remove

the valve spring and retainer.

(4) For removal of the valve stem seal (Refer to 9 -

ENGINE/CYLINDER HEAD/VALVE STEM SEALS -
REMOVAL).

REMOVAL - CYLINDER HEAD ON

(1) Disconnect negative cable from battery.
(2) Remove spark plug wires and all spark plugs.
(3) Remove cylinder head cover(s). (Refer to 9 -

ENGINE/CYLINDER

HEAD/CYLINDER

HEAD

COVER(S) - REMOVAL)

(4) Remove rocker arms and shaft. (Refer to 9 -

ENGINE/CYLINDER

HEAD/ROCKER

ARMS

REMOVAL)

(5) Rotate engine until the piston in the cylinder

bore requiring spring removal is at TDC.

(6) Install Special Tool 8453 to the cylinder head

(Fig. 38). Tighten the attaching bolts to 23 N·m (200
in. lbs.).

(7) Install a spark plug adapter in the spark plug

hole. Connect air hose that can supply 620.5–689 kPa
(90–100 psi) of air pressure to adapter. This is to
hold valves in place while servicing components.

(8) Locate the forcing screw and spring retainer

adapter assembly over the spring requiring removal
(Fig. 38).

(9) Slowly turn the forcing screw clockwise (com-

pressing the valve spring) until the valve keepers can
be removed.

(10) Turn forcing screw counterclockwise to relieve

spring tension. Remove retainer and valve spring.

(11) Repeat procedure for each cylinder requiring

valve spring removal.

INSPECTION

NOTE: The are two different types of valve springs
used that are interchangable, but have different
specifications (Refer to 9 - ENGINE/CYLINDER
HEAD/VALVE SPRINGS - DESCRIPTION).

Whenever valves have been removed for inspection,

reconditioning or replacement, valve springs should
be tested (Fig. 39). As an example; the compression
length of a spring to be tested is 38.00 mm (1.496
in.). Turn the table of Tool C-647 until surface is in
line with the 38.00 mm (1.496 in.) mark on the
threaded stud and the zero mark on the front. Place
spring over stud on the table and lift compressing
lever to set tone device. Pull on torque wrench until
ping is heard. Take reading on torque wrench at this
instant. Multiply this reading by two. This will give
the spring load at test length. Fractional measure-
ments are indicated on the table for finer adjust-
ments. Refer to Engine Specifications to obtain

Fig. 37 VALVE SPRING - REMOVE/INSTALL

1 - SPECIAL TOOL C-3422-D SPRING COMPRESSOR
2 - SPECIAL TOOL 8464 ADAPTER

Fig. 38 VALVE SPRING - REMOVE/INSTALL (HEAD

ON)

1 - SPECIAL TOOL 8453
2 - BOLTS - SPECIAL TOOL ATTACHING
3 - AIR SUPPLY HOSE ADAPTER

9 - 112

ENGINE 3.3/3.8L

VALVE SPRINGS (Continued)

Content .. 948 949 950 951 ..