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4.
Select a method for adjusting the valve lash for the valve layout on both four- and six-cylinder engines. There are two
acceptable methods for adjusting valve lash:
• In order, according to the timing sequence used for fuel injection ("Method One")
• By type of valve, depending on crankshaft position ("Method Two")
14.4.1
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.
1.
For each cylinder, use the cranking device to rotate 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 push rods without effort.
NOTE:
When the piston in cylinder #1 is at ignition TDC, the valves of cylinder #6 (cylinder #4 on the four-cylinder
engine) will overlap, meaning that both intake and exhaust valves are partially open, and show no measurable
play when tested with a feeler gauge.
2.
Check each valve and adjust it (if necessary), using the procedures under the headings "Checking Valve Lash" and
"Adjusting Valve Lash" in this section.
Table 10.
Valve Adjustment- Method One
Engine
Crankshaft
Position
Cylinders
4-cylinder
Ignition
Sequence
1
3
4
2
NA
NA
Valve Overlap
4
2
1
3
NA
NA
6-cylinder
Ignition
Sequence
1
5
3
6
2
4
Valve Overlap
6
2
4
1
5
3
14.4.2
Method Two: Adjust All Valves Using Two Crankshaft Positions
Method two allows you to adjust all the valves using just two crankshaft positions.
1.
Using the cranking device, turn the crankshaft until cylinder #1 is at the ignition TDC position (all valves are closed)
and cylinder #6 (cylinder #4 on the four-cylinder engine) is at the valve overlap position (all valves are open).
2.
Check the valves listed in Table "Valve Adjustment - Method Two" in the "Ignition TDC" row and adjust them (if
necessary), using the procedures under the headings "Checking Valve Lash" and "Adjusting Valve Lash."
3.
Using the cranking device, turn the crankshaft until cylinder #6 (cylinder #4 on the four-cylinder engine) is at the
ignition TDC position (all valves are closed) and cylinder #1 is at the valve overlap position (valves are open).
14 Maintenance
32
All information subject to change without notice.
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