Lifter / Lash Adjuster: Service and Repair

Valve Tappets





Special Tool(s)





Material

Removal

CAUTION: During engine repair procedures, cleanliness is extremely important. Any foreign material, including any material created while cleaning gasket surfaces, that enters the oil passages, coolant passages or the oil pan can cause engine failure.

,CAUTION: The crankshaft, the crankshaft sprocket and the pulley are fitted together by friction, using diamond washers between the flange faces on each part. For that reason, the crankshaft sprocket is also unfastened if you loosen the pulley. Therefore the engine must be retimed each time the damper is removed. Otherwise severe damage can occur.

NOTE: Valve tappets are select fit and the valve clearance must be checked before removing the tappets. If the valve clearance has already been checked, proceed with removal.

1. Remove the timing chain.





2. Remove the special tool.





3. Mark the position of the camshaft lobes on the No. 1 cylinder for assembly reference.





4. CAUTION: Failure to follow the camshaft loosening procedure can result in camshaft damage.

Loosen the camshaft bearing bolts in the sequence shown, one turn at a time. Repeat until all the tension is released.
^ Remove the camshaft bearing caps.
^ Remove the camshafts.

5. CAUTION: If the camshafts and valve tappets are to be reused, mark the location of the valve tappets to make sure they are assembled in their original positions.

Remove the valve tappets.

6. NOTE: The number on the valve tappets only reflects the digits that follow the decimal. For example a tappet with the number 0.650 has the thickness of 3.650 mm.

Inspect the valve tappets.

Installation





1. NOTE: Lubricate the valve tappets with clean engine oil.

Install the valve tappets.





2. CAUTION: Install the camshafts with the alignment notches in the camshafts lined up so the camshaft alignment plate can be installed. Make sure the lobes on the No. 1 cylinder are in the same position as noted in the removal procedure. Failure to follow this procedure can cause severe damage to the valves and pistons.

NOTE: Lubricate the camshaft journals and bearing caps with clean engine oil.

Install the camshafts and bearing caps. Tighten the bolts in the sequence shown in three stages.
^ Stage 1: Tighten the camshaft bearing cap bolts, one turn at a time, until the cam is fully seated.
^ Stage 2: Tighten the bolts to 7 Nm (62 inch lbs.).
^ Stage 3: Tighten the bolts to 16 Nm (12 ft. lbs.).





3. Install the special tool.
4. Install the timing chain.





5. Confirm each valve's clearance at base circle with the lobe pointed away from the tappet.