Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE
Valve And Valve Guide
| Valve overall length | mm (in) | Intake | 104.95 (4.1319) | |
| Exhaust | 96.53 (3.8004) | |||
| Valve head edge thickness | mm (in) | Intake | Standard | 0.8 - 1.2 (0.0315 - 0.0472) |
| Exhaust | Standard | 1.0 - 1.4 (0.0394 - 0.0551) | ||
| Valve stem outer diameter | mm (in) | Intake | Standard | 5.455 - 5.470 (0.2148 - 0.2154) |
| Exhaust | Standard | 5.445 - 5.460 (0.2144 - 0.2150) | ||
| Valve guide inner diameter | mm (in) | Standard | 5.500 - 5.512 (0.2165 - 0.2170) | |
| Clearance between valve and valve guide | mm (in) | Intake | Standard | 0.030 - 0.057 (0.0012 - 0.0022) |
| Exhaust | Standard | 0.040 - 0.067 (0.0016 - 0.0026) | ||
| Valve guide protrusion amount | mm (in) | Standard | 11.4 - 11.8 (0.4488 - 0.4646) | |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.