Usage:
(27)Engine Valve Lash
Numbering of Cylinders
Inlet Valve Lash-.015 inch (0.38 mm)
Exhaust Valve Lash-.035 inch (0.90 mm)
Valve lash need not be adjusted if within .003 inch (0.07 mm) of the lash given.
- 1. Stop the engine.
- 2. Clean the base of the valve covers to prevent dirt from getting into valve mechanism.
- 3. Remove the valve covers.
- 4. Remove the flywheel housing timing cover.
- 5. Turn the flywheel in the direction of normal rotation.
- 6. Align the "TC-1" timing mark for your engine, ("TC1-7", "TC1-11", or "TC1-15"), housing timing pointer.
When on compression stroke both inlet and exhaust valve rockers can be easily moved with finger pressure.
When on exhaust stroke only the inlet valve rockers can be moved freely with finger pressure.
- 7. Check the No. 1 cylinder rockers for movement. Determine if the piston is on COMPRESSION or EXHAUST STROKE.
- 8. Refer to the preceding table, and set only those valves specified in the appropriate table for No. 1 cylinder on compression stroke or exhaust stroke as determined in step 7.
- 9. Rotate the flywheel one revolution in the direction of normal rotation and align the flywheel "TC-1" timing mark.
- 10. Inspect the movement of the rockers for cylinder No. 2.
- 11. Set the remaining valves as specified in the table.
Adjusting Valve Lash
When adjusting valve lash, engine must be stopped and cold.
- 1. Loosen the locknut on the adjusting screw.
- 2. Turn the adjusting screw to obtain the proper valve lash.
- 3. Hold the adjusting screw and tighten the locknut.
- 4. Recheck the valve lash.
(28)Engine Valve Rotators
After checking all valve clearances, and before installing the valve cover:
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When inspecting the valve rotators, protective glasses or face shield and protective clothing must be worn, to prevent being burned by hot oil sprayed by the valves. |
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- 1. Start the engine.
- 2. Move the governor control to low idle (600 rpm or lower) position. Generator sets will have to be adjusted down to 600 rpm for low idle position.
- 3. Watch the serrations on each valve retainer. Each valve retainer should turn slightly each time the valve closes.
If a valve fails to rotate, call your Caterpillar dealer.
If all valves rotate, proceed as follows:
- 4. Stop the engine.
- 5. Inspect valve cover gaskets. Install new gaskets if necessary.
- 6. Install the valve covers.
- 7. Install the flywheel housing timing cover.