ENGINE AR-CORE 4828728 - Caterpillar

Table 1
Required Tools
Tool Part Number Part Description Qty
A 8T-0455 Liner Projection Tool Group 1
Illustration 1 g00323908
Tooling (A)
( 1) Dial indicator
(2) Gauge body
(3) Gauge block
Use the Tooling (A) to check the depths of the inlet valves and the exhaust valves below the face of the cylinder head. Use the gauge block (3) to zero the dial indicator (1).
Ensure that the face of the valves are clean. Ensure that the bottom face of the cylinder head is clean. Ensure that the cylinder head is not distorted. Refer to Testing and Adjusting, "Cylinder Head - Inspect" for the procedure to measure flatness of the cylinder head.
Illustration 2 g00323909
Typical example
Measurement of the valve depth
(1) Dial indicator
(2) Gauge body
Position gauge body (2) and dial indicator (1) in order to measure the valve depth. Measure the depth of the inlet valve and the exhaust valve before the valve springs are removed.
The minimum and maximum limits for a new engine follow: Inlet valves Minimum ... 0.905 mm (0.0356 inch)Maximum ... 1.163 mm (0.0458 inch)Exhaust valves Minimum ... 0.876 mm (0.0345 inch)Maximum ... 1.131 mm (0.0445 inch)
Service wear occurs on an engine which has been in operation. If the valve depth below the cylinder head face on a used engine exceeds the specification for service wear, the following components must be replaced.
Valves
Valve insertsWear limit for inlet valves ... 1.41 mm (0.0555 inch)Wear limit for exhaust valves ... 1.38 mm (0.0543 inch)
Check each valve for cracks. Check the stems of the valves for wear. Ensure that the valves are the correct fit in the valve guides. Refer to Testing and Adjusting, "Valve Guide - Inspect" for the procedure to inspect the valve guides.
Check the load on the valve springs. Refer to Specifications, "Cylinder Head Valves" for the correct lengths and specifications for the valve springs.