SPRING 2587665 - Caterpillar

Note: Valve lash is measured between the rocker arm and the valve bridge. 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. Check the valve lash while the engine is stopped. The valve lash setting is specified in Table 1.
Table 1
Quick Reference for Engine Valve Lash Setting
C-10 and C-12 Engines    
   Inlet Valves    Exhaust Valves    
Valve Lash Setting    
0.38 0.08 mm (0.015 0.003 inch)    
0.64 0.08 mm (0.025 0.003 inch)    
TC Compression Stroke     1-2-4     1-3-5    
TC Exhaust Stroke (1)     3-5-6     2-4-6    
Firing Order     1-5-3-6-2-4 (2)    
( 1 ) 360° from TC compression stroke
( 2 ) The No. 1 cylinder is at the front of the engine.If the measurement is not within this range, an adjustment is necessary. Refer to "Valve Lash Adjustment" for the proper procedure.Valve Lash Adjustment
Illustration 1 g00386924
Cylinder and valve location (A) Exhaust valves (B) Inlet valves
Table 2
Engine Valve Lash Setting    
Valves    Valve Lash Setting    
Inlet    
0.38 0.08 mm (0.015 0.003 inch)    
Exhaust    
0.64 0.08 mm (0.025 0.003 inch)    Adjust the valve lash while the engine is stopped. Use the following procedure to adjust the valve lash:
Put the No. 1 piston at the top center position. Refer to Testing and Adjusting, "Finding the Top Center Position For No. 1 Piston".Note: If the engine is equipped with an engine compression brake, loosen the adjusting screw for the lash on the slave piston for the compression brake prior to adjusting the engine valve lash. Refer to the Testing and Adjusting, "Slave Piston Lash - Adjust" for information that relates to the adjustment of the slave piston lash for the engine compression brake.
Before any adjustments are 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.Note: Refer to Table 2 for the appropriate engine valve lash setting.
Make an adjustment to the valve lash on the inlet valves for cylinders 1, 2, and 4.
Illustration 2 g00481639
Engine valve lash adjustmentTypical example (1) Rocker arm (2) Adjustment locknut
Loosen