Valve Clearance Adjustment
VALVE CLEARANCE ADJUSTMENT
1. Remove the engine front cover blind plug shown in the figure.
2. Insert a M6 bolt (45-80 mm {1.8-3.1 in} length bolt with threads to the end) into the service hole (right side) by hand as shown in the figure. Pull back the inserted bolt approx. 2 mm {0.08 in} from where it contacts the tensioner arm, and set the bolt in a position slightly outward of the tensioner arm.
3. Release tension on the timing chain.
1. Press down the link plate of the chain tensioner from the service hole on the left side using a thin flathead screwdriver (precision screwdriver) as shown in the figure. Then rotate the crank pulley backwards (counterclockwise) with the plunger lock released.
Note: When the crankshaft pulley is turned counterclockwise, the timing chain loosens because the tensioner arm is pressed by the timing chain and the plunger of the chain tensioner is pressed in.
2. Insert the M6 bolt installed to the engine front cover to the position where it catches the inside of the rib on the tensioner arm.
Note: When the timing chain loosens, the tensioner arm moves to the position shown in the figure and presses the M6 bolt to secure the tensioner arm.
4. Fix the camshaft using a wrench on the cast hexagon.
5. Remove the camshaft sprocket installation bolt.
6. Remove the timing sprocket on the exhaust side with the timing chain positioned out of the way.
7. Loosen the camshaft cap installation bolts in two to three passes in the order shown in the figure, and remove the camshaft caps.
8. Remove the intake and exhaust side camshafts.
9. Remove the tappets.
10. Select a proper tappet according to the result of the valve clearance inspection and install it.
Tappet to be selected: thickness of the removed tappet + measured valve clearance - standard valve clearance
Standard valve clearance [Engine cold] 0.27-0.33 mm {0.011-0.012 in}
11. Align the timing marks on the crank pulley and the engine front cover, and then align the No.1 cylinder to the TDC.
12. Install the intake and exhaust camshafts with the
No.1 cylinder so that it is near TDC of the compression stroke.
13. Install the camshaft cap to the position shown in the figure, and temporarily tighten the No.2 and No.7 camshaft installation bolts.
14. Tighten the camshaft installation bolts in two to three passes uniformly in the order shown in the figure.
Tightening torque: 12-14 N.m {123-142 kgf.cm, 107-123 in.lbf}
15. Install the exhaust camshaft sprocket and the timing chain at the same time.
- Align the sprocket timing marks on the intake and exhaust camshafts so that they form a straight line in alignment with the upper horizontal surface of the cylinder head.
16. Hold the exhaust camshaft using a wrench on the cast hexagon.
17. Tighten the camshaft sprocket installation bolt.
Tightening torque: 50-60 N.m {5.1-6.1 kgf.m, 37-44 ft.lbf}
18. Remove the M6 bolt holding the tensioner arm.
19. Verify that there is no slack in the timing chain, and then verify that the marks on the camshaft sprocket and the crank pulley are aligned.
20. Inspect the valve timing by rotating the crankshaft clockwise twice.
21. Install the new engine front cover blind plug.
Tightening torque: 3.0-6.0 N.m {31-61 kgf.cm, 27-53 in.lbf}