Rottler SG7, Operation And Maintenance Manual, Page: 39 / 102

Section 5 Operating Instructions SG7 Manual
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5-9
Checking Valve Seat Concentricity
Make sure pilot and valve seat to be measured are free from dust, burrs, etc. A drop of oil or similar
lubricant on valve seat will aid measuring. Loosen brass locking screw and lower dial gauge down over
pilot. Make certain the tip of the probe is centered on the valve seat to be inspected.
Grasp brass frame in middle of gauge and move upward approximately 1/8”. The dial pointer should
move as this is done. Center the pointer of the indicator pointing upward and lock the gauge to the pilot
using the brass locking screw. Test proper alignment by moving the brass frame up and down. The
pointer should move.
Set the pointer at (0) by turning the dial face.
Inspect the seat run out by rotating the probe around the valve seat by twisting the knurled sleeve with
your fingers. Each number on the dial indicator is equal to 0.001”, (0.0254mm) run out of the valve seat.
Each mark on the dial indicator is equal to 0.0001”, (0.00254mm) run out of the valve seat.