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.
Engine Valves & Valve Springs Specifications
2004 Acura 3.5RLSECTION Engine Valves & Valve Springs Specifications
VALVES & VALVE SPRINGS
| Application | Specification | ||||||
|---|---|---|---|---|---|---|---|
| Intake Valves | |||||||
| Face Angle | 45° | ||||||
| Head Diameter | 1.295-1.303" (32.90-33.10 mm) | ||||||
| Margin | |||||||
| Standard | 0.033-0.045" (0.85-1.15 mm) | ||||||
| Service Limit | 0.026" (0.65 mm) | ||||||
| Stem Diameter | |||||||
| Standard | 0.2157-0.2161" (5.480-5.490 mm) | ||||||
| Service Limit | 0.215" (5.45 mm) | ||||||
| Valve Length | 4.472-4.483" (113.58-113.88 mm) | ||||||
| Valve Stem Installed Height | |||||||
| Standard | 1.8478-1.8671" (46.935-47.425 mm) | ||||||
| Service Limit | 1.8750" (47.625 mm) | ||||||
| Exhaust Valves | |||||||
| Face Angle | 45° | ||||||
| Head Diameter | 1.098-1.106" (27.90-28.10 mm) | ||||||
| Margin | |||||||
| Standard | 0.053-0.065" (1.35-1.65 mm) | ||||||
| Service Limit | 0.045" (1.15 mm) | ||||||
| Stem Diameter | |||||||
| Standard | 0.2146-0.2150" (5.450-5.460 mm) | ||||||
| Service Limit | 0.213" (5.42 mm) | ||||||
| Valve Length | 4.568-4.580" (116.03-116.33 mm) | ||||||
| Valve Stem Installed Height | |||||||
| Standard | 1.8852-1.9045" (47.885-48.375 mm) | ||||||
| Service Limit | 1.9124" (48.575 mm) | ||||||
| Valve Springs Free Length | |||||||
| Intake | |||||||
| NH (1) | 2.018" (51.25 mm) | ||||||
| CH (2) | 2.022" (51.35 mm) | ||||||
| Exhaust | |||||||
| NH (1) | 2.210" (56.13 mm) | ||||||
| CH (2) | 2.208" (56.09 mm) | ||||||
|
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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.