DSG-423 ENGINE
02-16
CAUTION: Do not rely on the Camshaft Alignment
Plate to prevent camshaft rotation. Damage to the
tool or the camshaft can occur.
7. Using the flats on the camshaft to prevent camshaft
rotation, tighten the sprocket bolts:
• Tighten to 65 Nm (48 lb-ft).
8. Install the front cover -- Refer to“Engine Front Cover
- Installation” on page 12 of this section.
9. Install or reconnect any other component removed
or disconnected.
Valve Spring - Removal
CAUTION: The crankshaft, the crankshaft sprocket
and the pulley are fitted together by friction, with
diamond washers between the flange faces on each
part. For that reason, the crankshaft sprocket is
also unfastened if you loosen the pulley. Therefore,
the engine must be retimed each time the damper is
removed. Otherwise severe damage can occur.
1. Remove the valve tappets -- Refer to“Valve Tappet -
Replacement” on page 18 of this section.
WARNING: ALWAYS WEAR PROTECTIVE
GOGGLES WHEN WORKING WITH COMPRESSED
AIR. THIS CAN PREVENT INJURY. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN
PERSONAL INJURY.
CAUTION: Use compressed air at 7-10 bars (100-150
psi). Do not disconnect the compressed air from the
cylinder until the valve spring, valve retainer and
valve spring retainer keys are installed.
1. Remove spark plug of the cylinder being serviced.
2. Using special tools, apply compressed air to the
cylinder of the valve spring being removed.
3. Using special tools 303-350, 303-300 and 303-472,
compress valve spring and remove the retainer keys
using some grease and a small screwdriver.
4. Remove the valve spring retainer and valve spring.
NOTE: Place all parts in order to one side.
CAUTION: Keep air pressure in cylinder until valve
spring is reinstalled.
Valve Spring - Installation
CAUTION: Check that there is no dirt or particles
within the valve stem grooves. Check the seating of
the valve collets.
1. Install the valve spring and retainer.
2. Using special tools, compress valve spring and
install the valve retainer keys.
3. Release spring and check that keys are seated
properly.
4. Remove air supply and all special tools.
5. Install the valve tappets -- Refer to“Valve Tappet -
Replacement” on page 18 of this section.
6. Install spark plug:
• Tighten to 15 Nm (11 lb-ft).
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