Removing the camshaft was discussed in the article - "Dismantling the cylinder head» .

With increased wear of the camshaft in the engine, oil pressure may drop and valve knock may appear even with serviceable hydraulic lifters.

Detection of the camshaft of the VAZ-2123 engine

We disassemble the camshaft bearing housing, for which we unscrew the two bolts securing the camshaft thrust flange with a 10 wrench

Detection of the camshaft of the VAZ-2123 engine

Remove the thrust flange from the groove in the front bearing journal of the shaft.

Detection of the camshaft of the VAZ-2123 engine

Remove the camshaft from the bearing housing by sliding it forward.

When removing the camshaft from the bearing housing, be careful not to damage the surfaces of the supports under the camshaft journals with the sharp edges of the cams.

Inspection of the working surfaces of the camshaft

Inspecting the camshaft.

On the working surfaces of the necks, scuffing, nicks, scratches, aluminum enveloping from the bearing housing are not allowed.

Detection of the camshaft of the VAZ-2123 engine

On the working surfaces of the cams, wear of more than 0.5 mm is not allowed, as well as scuffing and wear of the cams in the form of a cut.

Replace the shaft with detected defects.

Detection of the camshaft of the VAZ-2123 engine

Measure the diameters of the bearing journals of the shaft.

They should be (counting from the front):

  • 1 - 45.915-45.931 mm;
  • 2 - 45.615-45.631 mm;
  • 3 - 45.315-45.331 mm;
  • 4 - 45.015-45.031 mm;
  • 5 - 43.415-43.431 mm

Detection of the camshaft of the VAZ-2123 engine

Inspecting the camshaft bearing housing.

Cracks on the hull are not allowed.

On the working surfaces of the supports under the necks, no marks, scratches, scuffs, excessive wear are allowed.

The main dimensions of the VAZ-2123 engine camshaft bearing housing

Measure the inside diameters of the camshaft housing bearings.

They should be (counting from the front):

  • 1 - 46.000-46.025 mm;
  • 2 - 45.700-45.725 mm;
  • 3 - 45.400-45.425 mm;
  • 4 - 45.100-45.125 mm;
  • 5 - 43.500-43.525 mm.

If the gaps between the shaft journals and the bearings exceed 0.2 mm (wear limit), replace the housing and, if necessary, the camshaft.

The order in which the camshaft bearing housing nuts are tightened

Install the new camshaft and bearing housing, as well as all removed components and parts, in the reverse order of removal.

Before installing the camshaft into the bearing housing, lubricate the working surfaces of the journals and camshaft cams with engine oil.

Tighten the bearing housing nuts in the order shown in the figure.

Moment for pulling nuts - 18.33–22.6 Nm (1.87–2.3 kgf.m).

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