Facing crankcase mating surface - RA01001191200X(01-1200)

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:

Engine, pistons, cylinder heads and crankshaft removed.

Fig 1: Identifying Crankcase Height

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

DATA

Engine

119.96

119.97/98

Height "A" of crankcase

245.35-245.45

228.90-229.00

Minimum height after required stock removal⁽¹⁾

245.25

228.80

Permissible variation of parallelism of top mating surface to crankshaft center

in longitudinal direction

0.08

in transverse direction

0.05

Permissible variation of evenness of top mating surfaces

0.02

Averaged peak-to-valley height (Rz) of top mating surface

0.006-0.016

Pressure-testing pressure: water chamber with air under water in bar gauge

Chambers of cylinder bores

see note

⁽¹⁾	The stock removal at the crankcase and at the cylinder head of an engine must together be not more than 0.4 mm (see 01-4180 ).

NOTE: Face crankcase together with timing case cover. Always face right and left bank of cylinders by the same amount.

After facing, chamfer the cylinder bores as shown in the sketch.

Fig 2: Identifying Cylinder Bore Chamfer Dimension

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Chamfer cylinder bores with a suitable handmilling cutter as shown in the sketch. Equalize bottom edge of chamfer with polishing stone.

If the crankcase mating surface is machined, the timing must be checked (see CHECKING TIMING OF CAMSHAFTS - RA05001192150X(05-2150) ).

Fig 3: Chamfering Cylinder Bore With Handmilling Cutter

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.