Valve Clearance Adjustment
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Hydraulic valve lifters automatically adjust stem-to-rocker arm clearance. Repeated valve and/or valve seat refacing will change stem-to-rocker arm clearance. To compensate for excessive changes in stem-to-rocker arm clearance, a longer or shorter push rod must be installed. Push rods are available in .060" (1.52 mm) longer or shorter than original.
Use following procedure to adjust valve clearance:
- Using a remote starter (ignition off), rotate crankshaft until No. 1 piston is at TDC of compression stroke. Reference mark "A" indicates TDC. With No. 1 piston at TDC, mark references "B" and "C", 90 degrees apart. See Fig 1.
- Slowly bleed lifter down (until bottomed) using Tappet Bleed Down Wrench (T71P-6513-B) on appropriate cylinder. See VALVE CLEARANCE ADJUSTMENT table. With lifter plunger bottomed, use a feeler gauge to measure clearance between rocker arm and valve stem tip. See VALVE LIFTERS table under ENGINE SPECIFICATIONS.
- If clearance is insufficient, install .060" (1.52 mm) undersize push rod. If clearance is excessive, install .060" (1.52 mm) oversize push rod. Check and/or adjust valve clearance on proper cylinders in relation to crankshaft position. See VALVE CLEARANCE ADJUSTMENT table.
VALVE CLEARANCE ADJUSTMENT
| Crankshaft Position | Check Intake No. | Check Exhaust No. |
|---|---|---|
| "A" | 1, 4, 8 | 1, 3, 7 |
| "B" | 3, 7 | 2, 6 |
| "C" | 2, 5, 6 | 4, 5, 8 |
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES
article in GENERAL INFORMATION before disconnecting battery.