Chrysler PT Cruiser 2001 Service Manual Supplement page 1045

9a - 62 2.0L DOHC ENGINE
DISASSEMBLY AND ASSEMBLY (Continued)
(7) When seat is properly positioned the width of
intake and exhaust seats should be 0.90–1.30 mm
(0.035–0.051 in.) (Fig. 139).
Fig. 139 Refacing Valve Seats
1 – A-SEAT WIDTH (INTAKE AND EXHAUST 0.90 TO 1.30 MM
(0.035 TO 0.051 IN.)
B-FACE ANGLE (INTAKE & EXHAUST: 44 1/2°–45°)
C-SEAT ANGLE (INTAKE & EXHAUST: 45°–45 1/2°)
D-SEAT CONTACT AREA
E-SEAT DIAMETER
(8) Check valve tip height dimensions A after
grinding the valve seats or faces (Fig. 140). Grind
valve tip to 47.99 mm (1.889 in.) for exhaust valve
and 48.04 mm (1.891 in.) for intake valve when
installed in the head (Fig. 140). The valve tip cham-
fer may need to be reground to prevent seal damage
when the valve is installed.
Fig. 140 Checking Spring Installed Height and Valve
Tip Height Dimensions
1 – GARTER SPRING
2 – VALVE SPRING SEAT
3 – CYLINDER HEAD SURFACE
VALVE INSTALLATION
(1) Coat valve stems with clean engine oil and
insert in cylinder head.
(2) Install new valve stem seals on all valves using
a valve stem seal tool (Fig. 141). The valve stem
2001 PT CRUISER
seals should be pushed firmly and squarely over
valve guide.
CAUTION: If oversize valves are used, there is only
one oversize valve available. The same stem seal is
used on both the standard and oversize valve.
Fig. 141 Valve Stem Oil Seal Tool
1 – VALVE SEAL TOOL
2 – VALVE STEM
(3) Install valve springs and retainers. Compress
valve springs only enough to install locks, taking
care not to misalign the direction of compression.
Nicked valve stems may result from misalignment of
the valve spring compressor.
CAUTION: When
retainers with valve spring compressor the locks
can become dislocated. Check to make sure both
locks are in their correct location after removing
tool.
(4) Check the valve spring installed height B after
refacing the valve and seat (Fig. 140). Make sure
measurements are taken from top of spring seat to
the bottom surface of spring retainer. If height is
greater than 38.75 mm (1.525 in.), install a 7.620
mm (0.030 in.) spacer under the valve spring seat to
bring spring height back within specification.
(5) Install cam followers and camshaft as previ-
ously described in this section.
(6) Checking dry lash. Dry lash is the amount of
clearance that exists between the base circle of an
installed cam and the rocker arm roller when the
adjuster is drained of oil and completely collapsed.
Specified dry lash is 1.17 mm (0.046 in.) for intake
and 1.28 mm (0.050 in.) for exhaust. After performing
dry lash check, refill adjuster with oil and allow 10
minutes for adjuster or adjusters to bleed down
before rotating cam.
depressing the valve
PT
spring