Examining, facing contact surface of cylinder head - RA01001044180X(01-4180)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Preceding work:

Valves removed.

Operation no. of operation texts and work units or standard texts and flat rates:

Fig 1: Identifying Cylinder Head Of Contact Surface Position

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Reference size (H)	measure and note.
Cylinder head contact surface	face. Pay attention to note.
Sharp edges on edge of combustion chamber	deburr.
Reference size (H)	once again measure. Determine stock removal.
Valves (42) and (43)	insert.
Reference sizes (T) between end of valve stem and camshaft bearing base	measure; to do this, insert Ø 6 mm bar centered into the base of the camshaft bearing and measure size (T) with caliper gauge. If size measured is less than size "T", correct valve clearance compensation is no longer possible; replace valve seat ring or cylinder head if necessary.
Valve seats	machine according to stock removal on cylinder head (05-2910) .

DATA IN MM

Total height "H" of cylinder head

135.9-136.0

Total height "H" of cylinder head

135.9-136.0

Minimum height after machining ⁽¹⁾

135.5

Permissible deviation from evenness of contact surface

longitudinally

0.08

transversally

0.0

Permissible deviation of parallelism of top to bottom contact surface in longitudinal direction

0.1

Peak-to-valley height

0.003 - 0.010

with standard size camshaft bearing dia.

inlet

24, 21 - 24, 75

Reference size "T"

exhaust

22, 21 - 22, 75

with repair size camshaft bearing dia.

inlet

23, 96-24, 51

exhaust

21, 96 -22, 51

⁽¹⁾	The stock removal at the cylinder head and at the crankcase of an engine must together not be more than 0.4 mm (see (01-1200) ).

COMMERCIALLY AVAILABLE TOOLS

Surface grinding machine with milling device for light alloy surfaces

Knife-edge straight edge

NOTE: Only machine cylinder head contact surface if porous or damaged points are present or if an impermissible deviation from the evenness in the longitudinal direction is determined.

The top cylinder head contact surface must not be machined as otherwise the basic bores of the camshaft bearings are altered.

If cracking is suspected (internal loss of coolant), the cylinder head must be pressure-tested.