Chrysler PT Cruiser. Manual — part 707
CAMSHAFT(S)
DESCRIPTION
Both camshafts have six bearing journal surfaces
and two cam lobes per cylinder (Fig. 37). Flanges at
the rear journals control camshaft end play. Provision
for a cam position sensor is located on the intake
camshaft on the rear of the cylinder head. A hydro-
dynamic oil seal is used for oil control at the front of
the camshaft.
OPERATION
The camshaft is driven by the crankshaft via drive
sprockets and belt. The camshaft has precisely
machined lobes to provide accurate valve timing and
duration.
STANDARD PROCEDURE
MEASURING CAMSHAFT END PLAY
(1) Oil camshaft journals and install camshaft
WITHOUT rocker arms. Install rear cam caps and
tighten screws to specified torque.
(2) Using a suitable tool, move camshaft as far
rearward as it will go.
(3) Zero dial indicator (Fig. 38).
(4) Move camshaft as far forward as it will go.
(5) Record reading on dial indicator. For end play
specification, (Refer to 9 - ENGINE - SPECIFICA-
TIONS).
(6) If end play is excessive, check cylinder head
and camshaft for wear; replace as necessary.
REMOVAL
(1) Remove cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER - REMOVAL).
(2) Remove camshaft position sensor and camshaft
target magnet (Refer to 8 - ELECTRICAL/IGNITION
CONTROL/CAMSHAFT
POSITION
SENSOR
-
REMOVAL).
(3) Remove timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
REMOVAL).
(4) Remove camshaft sprockets and timing belt
rear cover (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT COVER(S) - REMOVAL).
(5) Bearing
caps
are
identified
for
location.
Remove the outside bearing caps first (Fig. 39).
(6)
Loosen the camshaft bearing cap attaching
fasteners in sequence shown (Fig. 40) one camshaft
at a time.
CAUTION: Camshafts are not interchangeable. The
intake cam number 6 thrust bearing face spacing is
wider.
(7) Identify the camshafts before removing from
the head. The camshafts are not interchangeable.
(8) Remove camshafts from cylinder head.
NOTE: If removing rocker arms, identify for reinstal-
lation in the original position.
CLEANING
Clean camshaft with a suitable solvent.
Fig. 37 Camshafts
1 - CAMSHAFT BEARING CAPS
2 - PLUG
3 - CAMSHAFT
4 - CYLINDER HEAD
5 - CAMSHAFT OIL SEAL
Fig. 38 Camshaft End Play - Typical
9 - 108
ENGINE 2.4L DOHC
PT
INSPECTION
(1) Inspect camshaft bearing journals for damage
and binding (Fig. 41). If journals are binding, check
the cylinder head for damage. Also check cylinder
head oil holes for clogging.
(2) Check the cam lobe and bearing surfaces for
abnormal wear and damage. Replace camshaft if
defective.
NOTE: If camshaft is replaced due to lobe wear or
damage, always replace the rocker arms.
(3) Measure the lobe actual wear (unworn area -
wear zone = actual wear) (Fig. 41) and replace cam-
shaft if out of limit. Standard value is 0.0254 mm
(0.001 in.), wear limit is 0.254 mm (0.010 in.).
INSTALLATION
CAUTION: Ensure that NONE of the pistons are at
top dead center when installing the camshafts.
(1) Lubricate all camshaft bearing journals, rocker
arms and camshaft lobes.
(2) Install all rocker arms in original positions, if
reused.
(3) Position camshafts on cylinder head bearing
journals. Install right and left camshaft bearing caps
No. 2 – 5 and right No. 6. Tighten M6 fasteners to 12
N·m (105 in. lbs.) in sequence shown in (Fig. 42).
(4) Apply Mopar
t Gasket Maker to No. 1 and No.
6 bearing caps (Fig. 43). Install bearing caps and
tighten M8 fasteners to 28 N·m (250 in. lbs.).
NOTE: Bearing end caps must be installed before
seals can be installed.
(5) Install
camshaft
oil
seals
(Refer
to
9
-
ENGINE/CYLINDER
HEAD/CAMSHAFT
OIL
SEAL(S) - INSTALLATION).
(6) Install camshaft target magnet and camshaft
position sensor.
(7) Install cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER - INSTALLATION).
Fig. 39 Camshaft Bearing Cap Identification
Fig. 40 Camshaft Bearing Cap - Removal
1 - REMOVE OUTSIDE BEARING CAPS FIRST
Fig. 41 Checking Camshaft(s) for Wear
1 - UNWORN AREA
2 - ACTUAL WEAR
3 - BEARING JOURNAL
4 - LOBE
5 - WEAR ZONE
Fig. 42 Camshaft Bearing Cap Tightening Sequence
PT
ENGINE 2.4L DOHC
9 - 109
CAMSHAFT(S) (Continued)
(8) Install timing belt rear cover and camshaft
sprockets (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT COVER(S) - INSTALLATION).
(9) Install timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
INSTALLATION).
CYLINDER HEAD COVER
REMOVAL
(1) Remove upper intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
MANIFOLD
-
REMOVAL).
(2) Remove ignition coil and spark plug wires.
(3) Disconnect PCV and make-up air hoses from
cylinder head cover (Fig. 44).
(4) Remove cylinder head cover bolts.
CAUTION: When removing cylinder head cover
bolts, be careful not to interchange the two (2) cen-
ter bolts with the seven (7) perimeter bolts. The two
(2)
center
bolts
contain
an
aluminum
washer
between the bolt head and torque limiter for sealing
purposes.
(5) Remove cylinder head cover from cylinder
head.
INSTALLATION
NOTE: Replace spark plug well seals and bolt seals
when installing a new cylinder head cover gasket.
(1)
Install new cylinder head cover gaskets (Fig.
45) and spark plug well seals (Fig. 46).
Fig. 44 PCV and Make-up
1 - PCV HOSE
2 - MAKE-UP AIR HOSE
Fig. 45 Cylinder Head Cover Gasket and Spark Plug
Well Seals
1 - SPARK PLUG WELL SEALS
2 - GASKET
Fig. 43 Camshaft Bearing Cap Sealing
1 - 1.5 mm (.060 in.) DIAMETER BEAD OF MOPAR GASKET
MAKER
9 - 110
ENGINE 2.4L DOHC
PT
CAMSHAFT(S) (Continued)
(2) Replace cylinder head cover bolt seals (Fig. 47).
CAUTION: Do not allow oil or solvents to contact
the timing belt as they can deteriorate the rubber
and cause tooth skipping.
(3)
Apply Mopar
t Engine RTV GEN II at the
camshaft cap corners and at the top edges of the 1/2
round seal (Fig. 48).
CAUTION: When installing cylinder head cover
bolts, be careful not to interchange the two (2) cen-
ter bolts with the seven (7) perimeter bolts. The two
(2)
center
bolts
contain
an
aluminum
washer
between the bolt head and torque limiter for sealing
purposes.
(4)
Install cylinder head cover assembly to cylin-
der head. Install all bolts, ensuring the two (2) bolts
containing the sealing washer are located in the cen-
ter locations of cover. Tighten bolts in sequence
shown in (Fig. 49). Using a 3 step torque method as
follows:
(a) Tighten all bolts to 4.5 N·m (40 in. lbs.).
(b) Tighten all bolts to 9.0 N·m (80 in. lbs.).
(c) Tighten all bolts to 12 N·m (105 in. lbs.).
Fig. 46 Spark Plug Well Seals
Fig. 47 Cylinder Head Cover Bolt Assembly
Fig. 48 Sealer Locations
1 – SEALER LOCATION
Fig. 49 Cylinder Head Cover Tightening Sequence
(Typical Cover Shown)
PT
ENGINE 2.4L DOHC
9 - 111
CYLINDER HEAD COVER (Continued)
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