DSG-423 ENGINE
02-34
2. Remove cylinder head temperature (CHT) sensor.
3. Remove coolant outlet pipe.
4. Remove spark plugs and discard.
CAUTION: Note location of the tappets prior to
removal.
5. Remove 16 valve tappets.
6. Using special tools 303-350, 303-300 & 303-472,
compress valve spring and remove valve spring
retainer keys, retainers and springs.
7. Remove all special tools.
CAUTION: Note location of valves if they are to be
reused.
8. Remove valves.
9. Using special tools 303-005 and 303-468, remove
and discard valve stem seals.
10.Inspect valve, valve springs, retainers and keys --
refer to Section 1.
Engine Cleaning
During engine repair procedures, cleanliness is
extremely important. Any foreign material, including any
material created while cleaning gasket surfaces can
enter the oil passages, coolant passages or the oil pan,
and cause engine failure.
Place clean shop towels over exposed engine cavities.
Carefully remove the towels so foreign material is not
dropped into the engine.
CAUTION: Do not use metal scrapers, wire brushes,
power abrasive discs or other abrasive means to
clean the sealing surfaces. These tools cause
scratches and gouges that make leak paths. Use a
plastic scraping tool to remove all traces of the
gasket material and sealant.
CAUTION: Aluminum surfaces are soft and can be
scratched easily. Never place the cylinder head
gasket surface, unprotected, on a bench surface.
To clean residual sealant, oil, coolant and gasket
material from sealing area, use silicone gasket remover
and metal surface prep. A second application may be
required if traces of silicone or gasket material remain.
Allow to dry until there is no sign of wetness, or 4
minutes, whichever is longer. Failure to follow this
procedure can cause future oil leakage.
WARNING: OBSERVE ALL WARNINGS AND
CAUTIONS AND FOLLOW ALL APPLICATION
DIRECTIONS CONTAINED ON THE PACKAGING OF
THE SILICONE GASKET REMOVER AND METAL
SURFACE PREP.
NOTE: Do not attempt to make metal shiny. Some
staining of metal surfaces is normal.
Tappet
Key
Retainer
Spring
Seal
Valves
CHT Sensor
Spark Plug
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