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.
11 12 Valve Seat and Correction Specification N63 B44
2011 BMW Alpina B7SECTION 11 12 Valve Seat and Correction Specification N63 B44
VALVE SEAT AND CORRECTION ANGLE SPECIFICATION
| Valve seat angle | ° | 45 | |
| Correction angle: outer | ° | 15 | |
| Correction angle: inner | ° | 70 | |
| Valve seat width: Intake | mm | 0.9+0.1 | |
| Valve seat width: Exhaust | mm | 1.15+0.1 | |
| Valve seat | |||
| Valve seat surface: Outside dia. inlet | mm | 31.6+0.1 | |
| Valve seat surface: Outside dia. exhaust | mm | 27.6+0.1 | |
RENDER: 1.0x
NO RELATED
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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.