Valve guides, checking
- Insert valve into valve guide until end of valve stem is flush with end of guide. Due to the slight difference in stem diameters, ensure that only an intake valve is used in the intake guide and an exhaust valve in the exhaust guide.
- Measure the amount of sideways play (lateral play).
Wear limit
| Intake valve guide | Exhaust valve guide |
| 0.80 mm | 0.80 mm |
NOTE:
- If the wear limit is exceeded, repeat the measurement with new valves. If the wear limit is again exceeded, replace the valve guide.
- If the valve is to be replaced as part of a repair, use a new valve for the calculation.
Grinding in valve seats
- Grind in valve seats only as far as necessary to achieve a good seating pattern.