VALVE CLEARANCE ADJUSTMENT
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 .060" (1.52 mm) longer or shorter than original are available. Use following procedure to adjust valve clearance
Scheme 28
- 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. (Scheme 28)
- Slowly bleed lifter down (until bottomed) using Tappet Bleed Down Wrench (T71P-6513-B) on appropriate cylinder. See «VALVE CLEARANCE ADJUSTMENT»(ref-1341-S19409369632000031300000) table. With lifter plunger bottomed, use a feeler gauge to measure clearance between rocker arm and valve stem tip. See «VALVE LIFTERS»(ref-1341-S08084397572000031300000) 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»(ref-1341-S19409369632000031300000) table.
- After making adjustments at position "A", rotate crankshaft clockwise 180 degrees to position "B". Make necessary adjustment in this position. Then, rotate crankshaft clockwise 270 degrees to position "C". Repeat adjustment procedure.
| Crankshaft Position | Check Intake Valves No. | Check Exhaust Valves No. |
|---|---|---|
| A | 1, 4 & 8 | 1, 3 & 7 |
| B | 3 & 7 | 2 & 6 |
| C | 2, 5 & 6 | 4, 5 & 8 |
VALVE CLEARANCE ADJUSTMENT