Valve Guide Measurement
Measure
- Measure the valve stem (1) to-guide (2) clearance. Excessive valve stem-to-guide clearance may cause excessive oil consumption and may also cause a valve to break. Insufficient clearance will result in noisy and sticky functioning of the valve and will disturb the engine assembly smoothness.
- Clamp a dial indicator to the cylinder head at the camshaft cover rail.
- Locate the dial indicator so the movement of the valve stem from side to side, crossways to the cylinder head, will cause a direct movement of the indicator stem. The dial indicator stem must contact the side of the valve stem just above the valve guide.
- Drop the valve head about 0.064 mm off the valve seat.
- Use light pressure when moving the valve stem from side to side to obtain a clearance reading.