325, 325 L AND 325 LN EXCAVATORS 3LL00001-UP (MACHINE) POWERED BY ...
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Product: EXCAVATOR
Model: 325 LN EXCAVATOR 3LL00680
Configuration: 325, 325 L AND 325 LN EXCAVATORS 3LL00001-UP (MACHINE) POWERED BY 3116 ENGINE
Testing and Adjusting
3114, 3116, and 3126 Engines
Media Number -SENR3583-15 Publication Date -01/10/2008 Date Updated -26/03/2019
i01582980
Engine Valve Lash - Inspect/Adjust
SMCS - 1102-025
To prevent possible injury, do not use the starter to turn the flywheel.
Hot engine components can cause burns. Allow additional time for the
engine to cool before measuring valve clearance.
Note: Valve lash is measured between the rocker arm and the valve. All measurements and
adjustments must be made with the engine stopped and the valves FULLY CLOSED.
Valve Lash Check
An adjustment is NOT NECESSARY if the measurement of the valve lash is in the acceptable range
in Table 1.
Table 1
Valve Lash Check (Stopped Engine)
Inlet 0.30 to 0.46 mm (0.012 to 0.018 inch)
Exhaust 0.56 to 0.72 mm (0.022 to 0.028 inch)
If the measurement is not within this range, an adjustment is necessary. Refer to 5 for the proper
procedure.
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Valve Lash Adjustment
Table 2
Valve Lash Setting (Stopped Engine)
Inlet 0.38 mm (0.015 inch)
Exhaust 0.64 mm (0.025 inch)
Illustration 1 g00689649
Cylinder and valve location
(A) Exhaust valves
(B) Inlet valves
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Illustration 2 g00581993
Cylinder and valve location
(A) Exhaust valves
(B) Inlet valves
Use the following procedure to adjust the valve lash:
Illustration 3 g00708315
Valve Adjustment (Typical Example)
(1) Valve
(2) Rocker arm
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(3) Adjustment locknut
(4) Adjustment screw
1. Put the No. 1 piston at the top center position on the compression stroke. Refer to Testing and
Adjusting, "Finding Top Center Position for No. 1 Piston".
2. With the No. 1 piston at the top center position of the compression stroke, an adjustment can be
made to the valves. Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the
information that is required in order to adjust the valves.
Note: Before any actual adjustment is made, lightly tap the rocker arm at the top of the
adjustment screw with a soft mallet. This will ensure that the lifter roller seats against the
camshaft's base circle.
3. Loosen adjustment locknut (3).
4. If there is not enough clearance in order to insert the feeler gauge between rocker arm (2) and
valve (1), turn adjustment screw (4) counterclockwise in order to increase the clearance.
5. Place the appropriate feeler gauge between rocker arm (2) and the valve (1). Then, turn the
adjustment screw in a clockwise direction. Slide the feeler gauge between the rocker arm and
the valve. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge.
Remove the feeler gauge.
6. Tighten adjustment locknut (3) to a torque of 25 ± 7 N·m (18± 5 lb ft). Do not allow the
adjustment screw to turn while you are tightening the adjustment locknut. Recheck the valve
lash after tightening the adjustment locknut.
7. Remove the timing bolt and turn the flywheel by 360 degrees in the direction of engine rotation.
This will put the No. 6 piston at the top center position on the compression stroke. Install the
timing bolt in the flywheel.
8. Adjust the valve lash on the remaining valves. Refer to Testing and Adjusting, "Gear Group
(Front) - Time" for the information that is required in order to adjust the valves.
9. Repeat Step 3 through Step 6 for these valve adjustments.
10. Remove the timing bolt from the flywheel after all adjustments to the valve lash have been
made. Reinstall the timing cover.
Refer to Testing and Adjusting, "Unit Injector - Adjust".
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