Chrysler PT Cruiser. Manual — part 690
Fig. 46 Valve Spring/Seal - On Vehicle Service
1 - SPECIAL TOOL MD998772A
2 - SPECIAL TOOL 6779 ADAPTER
3 - SPECIAL TOOL 8813 ADAPTER STUDS/SPACERS
4 - AIR HOSE
Fig. 47 Special Tool 8448 Protective Sleeve
Fig. 48 Valve Stem Seal Removal - Typical
1 - VALVE SEAL TOOL
2 - VALVE STEM
9 - 40
ENGINE 1.6L SOHC
PT
VALVE SPRINGS AND SEALS (ON VEHICLE SERVICE) (Continued)
VALVE SPRINGS AND SEALS
(CYLINDER HEAD REMOVED)
STANDARD PROCEDURE - VALVE SPRINGS
AND SEALS (CYLINDER HEAD REMOVED)
(1) Compress valve spring using Special Tools
C-3422–D Spring Compressor with adapter 6526A
(Fig. 49).
(2) Remove valve locks (Fig. 50).
(3) Release valve spring compressor. Remove valve
spring retainer and valve spring.
(4) Remove valve seal/spring seat (Fig. 48).
(5) Replace valve seal/spring seat.
(6) Install valve spring and valve spring retainer.
(7) Compress valve spring using Special Tools
C-3422–D Spring Compressor with adapter 6526A
(Fig. 49).
(8) Install valve locks.
(9) Release Spring compressor.
(10) Repeat procedure for remaining valve springs
and seals.
INSPECTION
When valves have been removed for inspection, recon-
ditioning or replacement, valve springs should be tested
(Fig. 51). As an example; the compression length of the
spring to be tested is 38.00 mm (1.496 in.). Turn table of
Tool C-647 until surface is in line with the 38.00 mm
(1.496 inches.) 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. Frac-
tional measurements are indicated on the table for finer
adjustments. Refer to Engine Specifications to obtain
specified height and allowable tensions (Refer to 9 -
ENGINE - SPECIFICATIONS). Replace springs that do
not meet specifications.
Fig. 49 Valve Spring Removal/Installation
1 - SPECIAL TOOL C-3422-D
2 - SPECIAL TOOL 6526A
Fig. 50 Valves/Seals/Springs
1 - VALVE LOCKS
2 - VALVE SPRING RETAINER
3 - VALVE SPRING
4 - VALVE STEM SEAL/SPRING SEAT
5 - CYLINDER HEAD
6 - INTAKE VALVE
7 - EXHAUST VALVE
Fig. 51 Testing Valve Spring
1 - SPECIAL TOOL C-647
PT
ENGINE 1.6L SOHC
9 - 41
INTAKE/EXHAUST VALVES &
SEATS
STANDARD PROCEDURE - VALVE AND VALVE
SEAT REFACING
For all applicable valve and seat dimensions and
angles (Refer to 9 - ENGINE - SPECIFICATIONS).
(1) Reface valves using a suitable valve refacing
machine.
(2) Inspect the remaining margin after the valves
are refaced (Fig. 52). Intake valves with less than
0.79 mm (0.0312 in.) margin and exhaust valves with
less than 1.19 mm (0.0469 in.) margin should be
replaced.
(3) Valve seats which are worn or burned can be
reworked, provided that correct angle and seat width
are maintained. Otherwise the cylinder head must be
replaced.
(4) Reface valve seats using a suitable valve seat
machine
(5) When refacing valve seats, it is important that
the correct size valve guide pilot be used for reseat-
ing stones or cutter. A true and complete surface
must be obtained.
(6) Measure the concentricity of valve seat and
valve guide using a valve seat runout dial indicator.
Total runout should not exceed. 0.051 mm (0.002 in.)
(total indicator reading).
(7) 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 the valve face, lower valve seat
with a 15 degrees stone/cutter. If the blue is trans-
ferred to the bottom edge of valve face raise valve
seat with a 65 degrees stone/cutter.
(8) When seat is properly positioned the width of
intake and exhaust seats should be 0.75–1.25 mm
(0.029–0.049 in.) (Fig. 53).
(9) Check valve tip to cylinder head surface dimen-
sions after machining the valve seats or faces. Grind
valve tip until within specifications. Measure from
valve tip to cylinder head surface when valve is
installed in the head (measurement A) (Fig. 54). For
valve tip specifications, (Refer to 9 - ENGINE -
SPECIFICATIONS). The valve tip chamfer is needed
to be reground to prevent seal damage when the
valve is installed.
(10) Measure valve spring installed height (mea-
surement B) (Fig. 54). Measure from the top of the
valve spring seat/seal to the bottom of the valve
spring retainer. For valve spring installed height
specifications, (Refer to 9 - ENGINE - SPECIFICA-
TIONS).
Fig. 52 Intake and Exhaust Valve Refacing
1 - VALVE FACE
2 - VALVE MARGIN
Fig. 53 Valve Face and Seat
1 - SEAT WIDTH
2 - FACE ANGLE
3 - SEAT ANGLE
4 - SEAT CONTACT AREA
Fig. 54 Valve Tip Height/Valve Spring Installed
Height
A - VALVE TIP HEIGHT
B - VALVE SPRING INSTALLED HEIGHT
1 - GARTER SPRING
2 - TOP OF VALVE SPRING SEAT/SEAL
3 - CYLINDER HEAD SURFACE
9 - 42
ENGINE 1.6L SOHC
PT
ENGINE BLOCK
DESCRIPTION
The cast iron engine block is a two-piece assembly,
consisting of the engine block and bed plate (Fig. 55).
The bed plate incorporates the main bearing caps and
bolts to the engine block. This design offers a much
stronger lower end and increased engine block rigidity.
The rear oil seal retainer is integral with the block. The
bed plate and block are serviced as an assembly.
Fig. 55 Engine Block/Bedplate/Crankshaft
1 - MAIN BEARING CAP BOLTS
2 - BEDPLATE BOLTS
3 - BEDPLATE
4 - LOWER CRANKSHAFT MAIN BEARINGS
5 - CRANKSHAFT
6 - UPPER CRANKSHAFT MAIN BEARINGS
7 - ENGINE BLOCK
PT
ENGINE 1.6L SOHC
9 - 43
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст