These engines use solid cam followers with a removable adjustment shim. The valve lash clearance is measured with the original shim installed and checked against the specification. If adjustment is necessary, the original shim is removed, and a thicker or thinner shim is installed to obtain the proper clearance. Special tools are required in order to adjust the shim without removing the camshaft.
1.6L (Zm) Engines
- Before servicing the vehicle, refer to the Precautions section.
- Remove the cylinder head cover.
- Measure the valve clearance by turning the crankshaft clockwise until the No. 1 piston is at Top Dead Center (TDC).
Measure the valve clearance at
. If the clearance exceeds specifications, replace the adjustment shim.
- Turn the crankshaft clockwise 360 degrees until the No. 4 piston is at TDC. Measure the valve clearance at B . If the clearance exceeds specifications, replace the adjustment shim.
- Repeat this procedure for all the camshafts.
Turn the crankshaft clockwise until the cam on the camshaft requiring the adjustment is positioned straight up.
Remove the camshaft cap bolts as follows:
- For exhaust side No. 1, 2 and 3 cylinder adjustment shim removal use A .
- For intake side No. 1, 2 and 3 cylinder adjustment shim removal use B .
- For exhaust side No. 2, 3 and 4 cylinder adjustment shim removal use C .
- For intake side No. 2, 3 and 4 cylinder adjustment shim removal use D .
- Install special tools 49-T012-002 and 003, using the camshaft cap bolt holes. Tighten the bolts to 100-125 inch lbs. (11-14 Nm).
- Align the mark on the 49-T012-002 (shaft) with the mark on the 49-T012-003 (clamp). Tighten special tool 49-T012-004 (bolt) to secure the shaft.
- Position special tool 49-T012-001A toward the center of the cylinder head and mount it on the shaft where the adjustment shim needs replacement.
Position the notch of the tappet to allow a small prytool to be inserted.
- Set the special tool on the tappet by its notch. Tighten the mounting bolt B securing it on the shaft.
- Tighten bolt C , and press down the tappet.
- Using a small prytool, pry the adjustment shim upwards through the notch on the tappet. Remove the shim with a magnet.
- Select and install the proper adjustment shim. Loosen bolt C to allow the tappet to move up, and loosen bolt B to remove special tool 49-T012-001A.
- Remove special tools 49-T012-002, 003 and 004, and torque the camshaft cap bolts to 100-125 inch lbs. (11-14 Nm).
- Repeat the procedure for all necessary adjustment shims. Check the valve clearance.