Valve Springs Description; Operation; Removal; Removal - In Vehicle - Dodge Intrepid Service Manual

9 - 34 ENGINE 2.7L
INTAKE/EXHAUST VALVES & SEATS (Continued)
Fig. 33 Checking Valve Tip Height and Valve Spring
Installed Height
1 - SPRING RETAINER
2 - GARTER SPRING
3 - VALVE SPRING SEAT TOP
4 - CYLINDER HEAD SURFACE
VALVE SPRINGS
DESCRIPTION
The valve springs are made from high strength,
chrome-silicon steel (Fig. 11). The springs are com-
mon for intake and exhaust applications. The valve
spring seat is integral with the valve stem seal,
which incorporates a garter spring to maintain con-
sistent lubrication control to the valve stem.

OPERATION

The valve spring returns the valve against its seat
for a positive seal of the combustion chamber.

REMOVAL

REMOVAL - IN VEHICLE

(1) Perform fuel system pressure release procedure
before attempting any repairs. (Refer to 14 -
FUEL SYSTEM/FUEL DELIVERY - STANDARD
PROCEDURE)
(2) Disconnect negative cable from remote jumper
terminal.
(3) Remove air cleaner housing and inlet hose.
(4) Remove upper intake manifold. (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
REMOVAL)
ENGINE/CYLINDER
COVER(S) - REMOVAL)
9
DAMPER - REMOVAL), timing chain cover (Refer to
9 - ENGINE/VALVE TIMING/TIMING BELT /
CHAIN COVER(S) - REMOVAL), and timing chain
(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT/CHAIN AND SPROCKETS - REMOVAL).
-
REMOVAL)
installed in the cylinder being serviced, apply 620.5–
689 kPa (90–100 psi) air pressure. This is to hold
valves in place while servicing components.
6779, compress valve spring and remove valve locks,
retainer, and valve spring.
ENGINE/CYLINDER HEAD/VALVE STEM SEALS -
REMOVAL).

REMOVAL - OFF VEHICLE

springs using a Special Tool C-3422-D, Valve Spring
Compressor.
retainers, valve springs and valve spring seat/stem
seal assembly (Fig. 34).

INSPECTION

reconditioning or replacement, valve springs should
be tested (Fig. 35). 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
specified height and allowable tensions (Refer to 9 -
ENGINE - SPECIFICATIONS). Replace any springs
that do not meet specifications.
MANIFOLD -
(5) Remove cylinder head covers. (Refer to 9 -
(6) Remove crankshaft vibration damper (Refer to
- ENGINE/ENGINE
(7) Remove camshafts and rocker arms. (Refer to 9
ENGINE/CYLINDER
(8) With air hose attached to spark plug adapter
(9) Using Special Tool MD 998772A with adapter
(10) Remove valve stem seal (Refer to 9 -
(1) With cylinder head removed, compress valve
(2) Remove valve retaining locks, valve spring
Whenever valves have been removed for inspection,
HEAD/CYLINDER
BLOCK/VIBRATION
HEAD/CAMSHAFT(S)
LH
HEAD
-