BRACKET AS 1636741 - Caterpillar

Probable Causes
Rocker arm
Not enough lubrication
Worn rocker arm
Worn bridges for valves
Worn pushrods
Worn valve lifters
Worn camshaft
Worn valve stem
Incorrect valve lash
Loose retaining bolt(s) for rocker shaft
Worn valve springs
Valve seatsRecommended Actions
Rocker Arm
Check for proper installation of the rocker arm adjustment screw locknut. If the rocker arm adjustment screw locknut is loose, adjust the valve lash.Check the rocker arms for signs of wear. If there is too much wear, install new parts or rocker arms. Adjust the valve lash.Not Enough Lubrication
Check the lubrication in the valve compartment. Check for sufficient lubrication between the injector tappet and the rocker arm buttons.Worn Bridges for Valves
Check the bridges for signs of wear. Adjust the bridges and/or replace the bridges. If there is too much wear, install new parts. Adjust the valve lash.Worn Pushrods
Inspect the pushrods for signs of wear. If there is too much wear, install new pushrods. Adjust the valve lash.Worn Valve Lifters
Clean the valve train. Install new valve lifters.Worn Camshaft
Check the camshaft for wear.Worn Valve Stem
Check the valve stem for signs of wear. Check for free movement of valves. Check for a bent valve stem. Adjust the valve lash.Loose Retaining Bolt(s) for Rocker Shaft
Repair the retaining bolt for the rocker shaft and/or replace the retaining bolt.Worn Valve Springs
Check the valve springs for damage or for signs of wear. If there is too much wear, install new springs. Adjust the valve lash.Valve Seats
Check the valve seats for signs of wear. If there is too much wear, install new valve seats. Adjust the valve lash.