TAPPETS-VALVE
STANDARD PROCEDURE - MEASURING VALVE LASH
1. Remove engine cover.
2. Remove cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL).
3. Rotate camshaft so lobes are vertical (1).
4. Check clearance using feeler gauges.
5. Repeat for all tappets and record readings.
6. If clearance was too small, go to the clearance to small procedure.Clearance to Small.
7. If clearance was too large, go to the clearance to large procedure.Clearance to Large.
Clearance to Small
1. Remove camshafts (Refer to 9 - ENGINE/CYLINDER HEAD/CAMSHAFT(S) - REMOVAL).
2. Specification – clearance = change
3. Decrease bucket thickness by change figure.
4. Install camshafts (Refer to 9 - ENGINE/CYLINDER HEAD/CAMSHAFT(S) - INSTALLATION).
5. Verify that valve lash is correct.
Clearance to Large
1. Remove camshafts (Refer to 9 - ENGINE/CYLINDER HEAD/CAMSHAFT(S) - REMOVAL).
2. Clearance – specification = change.
3. Increase bucket thickness by change figure.
4. Install camshafts (Refer to 9 - ENGINE/CYLINDER HEAD/CAMSHAFT(S) - INSTALLATION).
5. Verify that valve lash is correct.
REMOVAL
NOTE: This procedure is for in-vehicle service with camshafts installed.
NOTE: Camshaft tappets must be replaced if cylinder head or camshafts are replaced.
1. Remove cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL).
2. Remove camshafts (Refer to 9 - ENGINE/CYLINDER HEAD/CAMSHAFT(S) - REMOVAL).
3. Remove camshaft tappets (1).
4. Repeat removal procedure for each camshaft tappet (1).
5. If reusing, mark each camshaft bucket for reassembly in original position.
INSTALLATION
NOTE: If reinstalling original tappets they must go back in their original location or engine damage could result.
1. Apply a light coat of clean engine oil to camshafts tappets (1) prior to assembly.
2. Install camshaft tappets (1) into cylinder head.
3. Repeat installation procedure for each camshaft tappet.
4. Install camshafts (Refer to 9 - ENGINE/CYLINDER HEAD/CAMSHAFT(S) - INSTALLATION).
NOTE: If installing new tappets, the valve lash procedure must be performed.
5. Install cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - INSTALLATION).