Camshaft: Testing and Inspection

CAMSHAFT INSPECTION




1. Set the No.1 and No.5 journals of the camshaft on V-blocks.
2. Measure the camshaft runout using a dial gauge.
- If it exceeds the maximum specification, replace the camshaft.

Camshaft maximum runout 0.03 mm {0.001 in}




3. Measure the cam lobe height as shown using the micrometer.
- If it is less than the minimum specification, replace the camshaft.

Cam lobe height
Standard
IN: 41.373 mm {1.6289 in}
EX: 40.597 mm {1.5983 in}
Minimum
IN: 41.30 mm {1.626 in}
EX: 40.53 mm {1.596 in}




4. Measure the camshaft journal diameter using the micrometer. Measurement positions total four, and they are in the X and Y directions, at the two points (A and B) as shown in the figure.
- If it is less than the minimum specification, replace the camshaft.

Camshaft journal diameter
Standard 25.950-25.975 mm {1.0217-1.0226 in}
Minimum 24.910 mm {0.98071 in}




5. Measure the camshaft journal oil clearance using a plastigauge with the tappet removed.

Note:
- Clean the camshaft journal and the journal receptacle part.
- Cut the plastigauge to the same length as the journal width and position it in parallel to the camshaft.
- If it exceeds the maximum specification, replace the cylinder head.

Camshaft journal oil clearance
Standard 0.025-0.071 mm {0.0010-0.0027 in}
Maximum 0.090 mm {0.0035 in}




6. Measure the camshaft end play using a dial gauge.
- If it exceeds the maximum specification, replace the cylinder head or the camshaft.

Camshaft end play
Standard 0.07-0.19 mm {0.003-0.007 in}
Maximum 0.20 mm {0.0079 in}