CYLINDER HEAD — Inspection (Cont'd): Valve Guide Clearance & Valve Guide Replacement
EM-21prose procedureInspection (Cont'd)
Valve Guide Clearance
- 1Measure valve deflection in a parallel direction with rocker arm. (Valve and valve guide mostly wear in this direction.)Valve deflection limit (Dial gauge reading): 0.2 mm (0.008 in)
SEM536B - 2If it exceeds the limit, check valve to valve guide clearance.
- a. Measure valve stem diameter and valve guide inner diameter.
SEM537B - b. Check that clearance is within specification. Valve to valve guide clearance limit: 0.1 mm (0.004 in)
- c. If it exceeds the limit, replace valve or valve guide.
| Specification | Value |
|---|---|
| Valve deflection limit (Dial gauge reading)Measured in parallel direction with rocker arm | 0.2mm (0.008 in) |
| Valve to valve guide clearance limit | 0.1mm (0.004 in) |
Valve deflection limit (Dial gauge reading)Measured in parallel direction with rocker arm
0.2mm (0.008 in)
Valve to valve guide clearance limit
0.1mm (0.004 in)
Valve Guide Replacement
- 1To remove valve guide, heat cylinder head to 150 to 160°C (302 to 320°F).
SEM008A - 2Drive out valve guide with a press [under a 20 kN (2 t, 2.2 US ton, 2.0 Imp ton) pressure] or hammer and suitable tool.
SEM596A - 3Ream cylinder head valve guide hole.Valve guide hole diameter (for service parts): Intake and Exhaust — 10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM538B
| Specification | Value |
|---|---|
| Valve guide removal — Cylinder head heat temperature | 150 to 160°C (302 to 320°F) |
| Valve guide removal — Press forceMinimum press pressure | 20 kN (2 t, 2.2 US ton, 2.0 Imp ton) |
| Valve guide hole diameter (for service parts) — IntakeAfter reaming | 10.175 - 10.196mm (0.4006 - 0.4014 in) |
| Valve guide hole diameter (for service parts) — ExhaustAfter reaming | 10.175 - 10.196mm (0.4006 - 0.4014 in) |
Valve guide removal — Cylinder head heat temperature
150 to 160°C (302 to 320°F)
Valve guide removal — Press forceMinimum press pressure
20 kN (2 t, 2.2 US ton, 2.0 Imp ton)
Valve guide hole diameter (for service parts) — IntakeAfter reaming
10.175 - 10.196mm (0.4006 - 0.4014 in)
Valve guide hole diameter (for service parts) — ExhaustAfter reaming
10.175 - 10.196mm (0.4006 - 0.4014 in)