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.
Valve guides, checking
2004 Audi A8SECTION Valve guides, checking
Special tools, testers and auxiliary items required
- Dial gauge holder VW 387
- Dial gauge
Test sequence
- Insert valve into guide. The end of the valve stem must be flush with the guide. Due to the slight difference in stem dimensions, ensure that only an intake valve is used in the intake guide and an exhaust valve in exhaust guide.
- Determine tip clearance.
Wear limit
| Intake valve guide | Exhaust valve guide |
| 0.80 mm | 0.80 mm |
NOTE:
- If wear limit is exceeded, re-measure using new valves. If wear limit is still exceeded, replace cylinder head. The valve guides cannot be replaced.
- If the valve is to be replaced as part of a repair, use a new valve for the calculation.
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.