Valve Guide Measurement Procedure
WARNING: This page is about a different variant/trim than selected.
- Measure the valve stem (1)-to-guide (2) clearance as follows:
- Excessive valve stem-to-guide clearance may cause an excessive oil consumption and may also case a valve to break. Insufficient clearance will result in noisy and sticky functioning of the valve and will disturb the engine assembly smoothness.
- Clamp the J 8001 to the cylinder head at the camshaft cover rail.
- Locate the dial indicator so that 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 1.6 mm (0.0064 in) off the valve seat.
- Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading.
- If the clearance for the intake valve is greater than 0.11 mm (0.0045 in) and a new standard diameter valve stem will not bring the clearance within specifications, the cylinder head must be replaced.
- If the clearance for the exhaust valve is greater than 0.12 mm (0.005 in) and a new standard diameter valve stem will not bring the clearance within specifications, the cylinder head must be replaced.
- Valve guide wear at the bottom 10 mm (0.39 in) of the valve guide is not significant to normal operation.