Check that the surfaces of the camshafts are free of scratches, impact marks and excessive wear (replace the camshaft if necessary).
The camshaft has 5 bearings. The camshafts are identified by the color coding shown in the table below.
Place the camshaft on two lightly oiled v-blocks (3).
Install the stand (4) and indicator (5).
Install the indicator on the mating surface of the main journal of the camshaft, in the center. Set the indicator needle to zero.
Turn the camshaft away from the lubrication hole area to check the roundness of the main journals, the misalignment should be less than 0.05mm.
Using a micrometer, measure the diameter (X1) all camshaft journals.
M4R engine:
- bearing neck No. 1: 27.935-27.955 mm;
- bearing neck No. 2, 3, 4, 5: 24.950-24.970 mm.