Section 12.1
Valve Lash Checking
Note: Adjust the valve lash when the engine is cold. Wait at least 30 minutes after shutdown, even if the engine ran only a short time.
In order, according to the timing sequence used for fuel injection (see Method One— Adjust Each Cylinder in Firing Order);
By type of valve, depending on crankshaft position (see Method Two—Adjust All Valves Using Two Crankshaft Positions).
See Figure "Cylinder and Valve Layout"
Figure 1. Cylinder and Valve Layout
Section 12.1.1
Method One — Adjust Each Cylinder in Firing Order
Method one allows you to adjust each cylinder in the order in which fuel is injected. The crankshaft must be repositioned after each cylinder is adjusted as listed in Table "Valve Adjustment (Method One)"
Table 1. Valve Adjustment (Method One)
Note: Clean each cylinder head cover before removing it.
1. Remove the cylinder head covers. See Figure "Cylinder Head Cover, (exploded view)" .
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Figure 2. Cylinder Head Cover, (exploded view)
2.Remove the inspection cover on the flywheel housing.
3.Fit the engine cranking tool (J 46392) into the inspection hole on the flywheel housing. See Figure "Placement of Engine Cranking Tool" .
Figure 3. Placement of Engine Cranking Tool
4.For each cylinder, use the cranking tool (J 46392) to turn over the crankshaft until the piston is exactly at top dead center (TDC) in the compression stroke. The valves must be closed and it must be possible to turn the pushrods without effort.
Note: When the piston in cylinder #1 is at ignition TDC, the valves of cylinder #6 will overlap, meaning that both intake and exhaust valves are partially open, and show no measurable play when tested with a feeler gauge.
5.Check each valve and adjust it (if necessary), using the procedures under the heading "Adjusting Valve Lash."
6.For each valve, measure the valve lash with a feeler gauge between the rocker arm and valve bridge. It should be possible to pull the feeler gauge through with no more than light resistance.
7.Table 4. Valve Lash Adjustment
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