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.
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HOMESERVICE MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYVALVE SPRINGSPRING DIMENSIONS
1991 Buick Century L4-151 2.5L VIN R TBI
Spring Dimensions
1991 Buick Century L4-151 2.5L VIN R TBISECTION Spring Dimensions
Vin U, Valve Spring Dimensions
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| Free Length | 2.2 Inch (in) |
| Installed Height | 1.68 Inch (in) |
| Seated Pressuure | 75 at 1.68 Pound Force At Inch (lbf @ in) |
| Compression Pressure | 173 at 1.24 Pound Force At Inch (lbf @ in) |
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.