G424 Service Manual Base Engine Service Procedure140
6EN0717
6EN0652
6EN0718
6EN0719
Removal Service Points
A Cylinder head bolt removal
Using special tool, loosen the cylinder head bolts.
Loosen each bolt evenly, little by little, by two or three steps.
B Retainer lock removal
Store removed valves, springs and other parts, tagged to
indicate their cylinder No. and location for reassembly.
C Valve stem seal removal
Caution: Do not reuse removed valve stem seal.
Inspection
1. Cylinder Head
(1) Check the cylinder head for water leaks, gas leaks,
damage or cracks before cleaning.
(2) Thoroughly remove oil, water scale, sealant, carbon
deposit, etc. After the oil passages have been cleaned,
blow air to make sure that they are clean.
(3) Check the cylinder head gasket surface for flatness by
using straightedge and thickness gauge.
If the service limit is exceeded, correct to meet the
specification.
Standard valve: 0.03 mm (0.0012 in.) or less.
Limit: 0.2 mm (0.008 in.)
Grinding limit: 0.2 mm (0.008 in.)
Cylinder head height (when new): 89.9 to 90.1 mm
(3.539 to 3.547 in.)
NOTE: Grinding the cylinder head is permitted as long as the
total thickness of the metal removed from the cylinder head
and the cylinder block does not exceed 0.2 mm (0.008 in.).
MB991654
MD998772
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