Note. Do not turn the camshaft during the maintenance check.
1. Install the camshaft (A) in the cylinder head (WITH) and bearing caps (IN), then tighten the mounting bolts in the sequence shown in the figure with a tightening torque of 26.5-29.5 Nm.
2. Install a dial indicator.
3. Set the dial gauge to zero, then move the camshaft back and forth to measure the end play. The allowable backlash is 0.05-0.15 mm.
4. To turn away bolts of fastening of a cover of bearings of a cam-shaft. Remove the camshaft and check its surface for damage and excessive wear. Check the running surface of the bearings for damage and wear. Lay a calibrated plastic wire on the camshaft, install the camshaft in the cylinder head.
5. Install the bearing caps and tighten the mounting bolts to the required torque.
6. Remove the camshaft bearing caps. Using a special template, measure the clearance between the camshaft and the bearing. Permissible clearance is 0.040-0.074 mm.
7. If the gap exceeds the allowable value, and the camshaft has been replaced, it is necessary to replace the cylinder head.
If the camshaft has not been replaced, it is necessary to measure the runout using a dial gauge. Permissible camshaft journal runout 0.035 mm (2nd and 4th) and 0.050 mm (3rd).
If the camshaft runout does not exceed the allowable value, it is necessary to replace the cylinder head. If the runout exceeds the allowable value, the camshaft must be replaced. Then re-measure the gap between the camshaft bearings and the necks, if the gap exceeds the allowable value, it is necessary to replace the cylinder head.
8. Measure the height of the camshaft cam (A). The height of the intake cams is 34.697-34.197 mm and the exhaust cams are 34.570-34.070 mm.
9. Using a feeler gauge and a ruler, measure the flatness of the mating surface of the block head with the cylinder.a. If the amount of flatness does not exceed 0.03 mm in width, 0.09 mm in length and 0.012 mm in diagonal (51 x 51 mm) - block head can be reused.
Note. The measurement should be made in the planes indicated in the figure.
10. If one of the values exceeds the allowable limit, it is necessary to replace the cylinder head.