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.
We disassemble the camshaft bearing housing, for which we unscrew the two bolts securing the camshaft thrust flange with a 10 wrench
Remove the thrust flange from the groove in the front bearing journal of the shaft.
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.
Inspecting the camshaft.
On the working surfaces of the necks, scuffing, nicks, scratches, aluminum enveloping from the bearing housing are not allowed.
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.
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
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.
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.
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).
