CONNECTOR-O-RING 2R6806 - Caterpillar

Introduction
Use this procedure for adjusting valves on C12.9L engines.Specifications
Table 1
Parameter Value
Inlet Valves 0.40 0.05 mm
(0.016 0.002 inch)
Exhaust Valves 0.60 0.05 mm
(0.024 0.002 inch)
Rocker arm adjustment nut 39 5 N m (29 4 lb ft)
Table 2
Firing Order
1-4-2-6-3-5 (1)
(1) The No. 1 cylinder is at the front of the engine.Note: The valve lash must be checked and adjusted by the proper sequence shown above. Rotate the engine in direction of rotation.Required Tools
Table 3
Qty Part Number
1 487-3130 Tool
487-3131 Spacer
1 456-7990 Timing Pin
487-3141 Checking Fixture
1 5801694399
Illustration 1 g06169129
Typical example of the 487-3130 Tool
Illustration 2 g06169134
Typical example of the 487-3131 Spacer
Illustration 3 g03703217
Typical example of the 456-7990 Timing Pin
Illustration 4 g06169138
Typical example of the 487-3141 Checking Fixture
Valve Lash
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.
Illustration 5 g06169191
Remove the flywheel speed sensor.
Rotate the engine past flywheel marks "D" and "E" and stop at the next mark "B".Refer to Testing and Adjusting, "Finding Top Center Position Number 1 Piston" for more information.a. Hole on flywheel with reference mark, corresponding to the TDC of pistons 2-5.b. Hole on flywheel with reference mark, corresponding to the TDC of pistons 1-6.c. Hole on flywheel with reference mark, corresponding to the TDC of pistons 3-4.d. Flywheel hole with two notches corresponding to position 54 degrees TDC of pistons 1-6. Camshaft timing reference.e. Flywheel hole with three notches corresponding to position 30 degrees TDC of pistons 1-6. References to high-pressure fuel pump timing system and phonic wheel timing.f. Flywheel holes before hole with three notches "anti-clock-wise rotation of flywheel" corresponding to position 36 degrees before TDC of pistons 1-6.x. Flywheel frontal hole corresponding to position 15 degrees before TDC.Adjustment of clearance between rocker arms and intake/exhaust valve control crosspieces must be performed with utmost care.Bring to blast phase cylinder to be adjusted, the valves of this cylinder are closed while the symmetric cylinder valves are balanced. Symmetric cylinders are 1-6, 2-5, and 3-4.To carry out the adjustments stated above, the sequence shown in the table is mandatory.To perform adjustments correctly, during each rotation phase, check the positioning accuracy using the tool for TDC Engine 456-7990 Tool, inserting the tool into the hole marked with a notch on the flywheel corresponding to the position of the pistons.
Table 4
Firing Order 1-4-2-6-3-5
Step Start and Rotation Clockwise Balance Valve of Cylinder No. Adjust Clearance of Valves Cylinder No.
First 1 and 6 at TDC 6 1
Second Rotate 120 degrees 3 4
Third Rotate 120 degrees 5 2
Fourth Rotate 120 degrees 1 6
Fifth Rotate 120 degrees 4 3
Sixth Rotate 120 degrees 2 5 Valve Lash Adjustment
Use the following procedure to adjust the valve lash:Refer to Testing and Adjusting, "Finding Top Center Position Number 1 Piston" for more information.
Illustration 6 g06169145
Adjust the clearance between the rocker arms and valves using a box wrench and feeler gauge (2).
The operating clearance is:
Table 5
Intake Valve 0.40 0.05