1. Start the Stand by compressor.
2. Stop the compressor whose bumping clearance has to be taken.
3. Isolate the system.
4. Put “Men at Work” tag.
5. Loosen the cylinder head bolts and lift it.
6. Measure the diameter /size of the lead ball.
7. Bring piston to TDC and put lead ball on centre of it.
8. Now, put the cylinder head and tighten it to required torque.
9. Now, again loosen the cylinder head bolt and remove the ball.
10. Measure the size of the ball.
11. The difference between the initial size and final size is the bumping clearance.
It can be adjusted by either putting a thinner gasket or putting shim on top half 
In a two stage tandem air compressor adjusting the first stage bump clearance will effect the bump clearance in the second stage,so how does it work out?
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Proper maintenance of an air compressor is necessary to ensure that it functions smoothly and is safe to use. Compressors that are not maintained properly can stop functioning and can also jeopardize you safety while using it. If you have an air compressor you need to know how to effectively maintain and store the device.
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