Grinding camshaft bearing journals

Mean roughness of camshaft bearing journal

0.005

Deviation of camshaft bearing journal from true when mounted at camshaft sprocket seat and rear camshaft bearing journal

0.030

Deviation of camshaft bearing journal from true

0.010

Bearing points (fig., refer to note)

1,9

3,10,11 4,5,12,13 6,7,14,15 8

bearing dia            38.016 50.066 50.016 51.519 53.019 54.019

38.000 50.050 50.000 51.500 53.000 54.000

Standard dimension

journal dia.

23.993 49.950 49.950 51.440 52.940 53.940

23.980

49.934 49.934

51.421

52.921

53.921

Intermediate stage —0.1 mm (exchange engines)

bearing dia.

49.966 49.916 51.419 49.950 49.900 51.400

52.919 53.919 52.900 53.900

journal dia.

49.850 49.850 51.340 52.840 53.840 49.834 49.834 51.321 52.821 53.821

1st repair stage -0.25 mm

bearing dia.

49.816 49.765 51.269 52.769 53.769 49.800 49.750 51.250 52.750 53.750

journal dia.

49.700 49.684

49.700 49.684

51.190 51.171

52.690 52.671

53.690 53.671

2nd repair stage —0.5 mm

bearing dia.

49.566 49.550

49.516 49.500

51.019 51.000

52.519 52.500

53.519 53.500

journal dia.

49.450 49.450

50.940 52.440 53.440 50.921 52.421 53.421

49.434

49.434

Camshaft bearing play

radial

0.057 0.124

0.100 0.132

0.050 0.082

0.060 0.098

0.060 0.098

0.060 0.098

axial

0.050 0.120

Dial gauge holder for camshaft axial play

136 589 04 21 00

05.2-225/1 F3

For camshafts with reground bearing journals, cam­shaft housings with repair stages —0.25 mm and —0.50 mm are available.

The bearing journals are not hardened.

Some exchange engines are delivered with camshaft bearings in intermediate and repair sizes. This means that a standard camshaft cannot be installed in this camshaft housing, since the bearing journals are larger in diameter than the bearings.

Also refer to coordination camshaft housing and camshafts (01-471).

Chamfer bearing journals after grinding (see sketch for dimensions).

1 Bolt dial gauge holder to camshaft housing.

2 Clamp dial gauge with a preload of about 3 mm.

3 Press back camshaft and set needle at 0.

4 Press camshaft forward and read axial play.

05.2-225/2 F3

Note: If the end play is too small, grind spacing sleeve or driver at face B as required.

If the axial play is too large, the spacer or dog must be ground at collar A.

05.2-225/3 F3