VALVE CLEARANCE ADJUSTMENT
Note. Valve shims are not repairable with camshafts in place. Failure to measure all clearances with camshafts in place will cause unnecessary repetition of this procedure.
- Disconnect negative battery cable. Remove valve covers. See «VALVE COVERS»(ref-97869-S07762799622001051200000) under REMOVAL & INSTALLATION. Remove spark plugs. Rotate engine by rotating crankshaft as necessary to bring each valve to base circle. Using a feeler gauge, measure intake and exhaust valve clearance, between camshaft base circle and valve tappet. See «VALVE ADJUSTMENT SPECIFICATIONS»(ref-97869-S41885101462001051200000) table.
- If clearance is not within specification, remove timing chains. See «TIMING CHAIN»(ref-97869-S30131559772001051200000) under REMOVAL & INSTALLATION. Remove camshaft. See «CAMSHAFT»(ref-97869-S16858226732001051200000) under REMOVAL & INSTALLATION. Remove shim. Select shims as follows: Measured Clearance + Base Shim Thickness - Desired Clearance = Required Shim Thickness. Install appropriate replacement shim to obtain specified clearance. Repeat procedure for each valve. Install camshaft. See «CAMSHAFT»(ref-97869-S16858226732001051200000) under REMOVAL & INSTALLATION. Measure new valve clearances and ensure they are within specification. Install timing chains. See «TIMING CHAIN»(ref-97869-S30131559772001051200000) under REMOVAL & INSTALLATION. Install valve covers. See «VALVE COVERS»(ref-97869-S07762799622001051200000) under REMOVAL & INSTALLATION.
| Application (1) | In. (mm) | |
|---|---|---|
| Intake | ||
| Clearance Range | .0070-.0086 (.18-.22) | |
| Desired | .0078 (.20) | |
| Exhaust | ||
| Clearance Range | .0090-.0106 (.23-.27) | |
| Desired | .01 (.25) | |
| (1) Perform valve adjustment with engine cold. | ||
| (1) | Perform valve adjustment with engine cold. |
VALVE ADJUSTMENT SPECIFICATIONS