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 MANUALSFORD1991CUTAWAY 5.8 H, C6REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSADJUSTMENTSVALVE CLEARANCE4.9L VALVE CLEARANCE ADJUSTMENT
1991 Ford Cutaway 5.8 H, C6
4.9L Valve Clearance Adjustment
1991 Ford Cutaway 5.8 H, C6SECTION 4.9L Valve Clearance Adjustment
NOTE:
Hydraulic valve lifters are used; no valve adjustment is required. If valve clearance is incorrect, use oversize or undersize push rods to correct clearance.
- Turn crankshaft damper so that No. 1 piston is at TDC on compression stroke. Make 2 chalk marks on crankshaft damper. The first, 120 degrees from timing mark. The second, 120 degrees from first chalk make. Crankshaft damper will be divided into 3 equal parts. Ensure rocker arm bolts No. 1 intake and exhaust valves are tightened at 17-23 ft. lbs. (23-31 N.m).
- Using Lifter Bleed Down Wrench (T70P-6513-A), slowly apply pressure to bleed down lifter until the plunger is completely bottomed. Check clearance between rocker arm and valve stem. Allowable specifications are .10-.20" (2.5-5 mm). Desired specifications are .125-.175" (3.175-4.445 mm). If clearance is incorrect specification, install oversize or undersize push rods to correct clearance.
- Repeat this procedure for the remaining valves. Adjust the valves in firing order sequence (1-5-3-6-2-4).
4.9L COLLAPSED VALVE LIFTER CLEARANCE
| Application | In. (mm) |
|---|---|
| Allowable | .100-.200 (2.54-5.08) |
| Desired | .125-.175 (3.175-4.445 |
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.