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.
1987 Ford Bronco II 4WD V6-177 2.9LFACTORY OEM SERVICE PROCEDURE
Valve, Intake/Exhaust
| Stem Diameter Intake | .3159-.3167 Inch (in) |
| Stem Diameter Exhaust | .3149-.3156 Inch (in) |
| Maximum Tip Refinish | 0.01 Inch (in) |
| Face Angle | 44 Degrees (deg) |
| Margin Intake | 1/32 Inch (in) |
| Margin Exhaust | 1/32 Inch (in) |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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