Dent in air compressor tank

Tighten the belts.

The maximum pressure on most small compressors is 10 bar or 1000kpa which is about 145 psi in the old language most safety valves are set to 150 psi. I suggest you get some one to reduce the pressure switch setting. Running a compressor at elevated pressures does not give you any more air. A reasonable pressure for small compressors is 120 psi

T wo suggestions. 1- check the check valve located in top of the receiver tank by letting the unit pump up to 50 psi. shut it off and loosen the copper tube at the HP cylinder. if no air blows out the check valve is good. If it's bad it will blow until it empties the tank. If the check valve is bad replace it. 2- Tighten the drive belt. If neither corrects the problem remove the guard and rotate the pump by hand. If it's hard to rotate you have a pump problem.

You have a receiver tank check valve leaking. If you loosen the 1/4 tube slightly and air blows out more and will not stop replace the tank check valve. If you follow the copper line for the compressor HP head back to the tank you will see that the line screws into the check valveand the check valve screws into the tank. Bleed all air from the tank,remove the 1/4 line and the 3/4 line from the check valve. Then unscrew the check valve. Install a new check valve and connect the lines. Problem solved.

A piston in any engine should be around 100 psi I would guess. A Chevy 350 used to be around 150 psi. An air compressor that only pumps enough air to reach 20psi is obviously too low on compression. Nailers and the like need 80 or more psi. The intake valves may be shot, the unloader might be stuck or piston rings are worn.

Model Number: SS3J5.5GH-WB Manufacturer: Ingersoll Rand Tank Size: 8 Gallons Engine Engine HP: 5.5 HP Engine Type: Honda GX 160 Fuel Tank: .8 Gallon Pump CFM @ 90 PSI: 11.8 Max Pressure: 135 PSI Certification: UL/CSA/ASME Overview Dimensions: 43" x 18" x 26" Product Weight: 175 lbs
this can be a reference.

Head bolts are generally 25-30# and should be reset after first 24hrs continuous.

clean fuel tank, and lines. just do a standard tune up. check every componet for wear or rust.

it could take up to 30 minutes from zero pressure

Hello,
Depending on the size of the dent, it is possible to remove it by a couple of ways.
One way it can be done is with a suction dent puller. It is usually used on cars to remove hail damage and door dings. Some auto parts stores carry them in stock.
Another way is to use an air compressor to "blow out" the dent. You will need to drain the fuel first, then close the supply petcock once the tank is empty. If possible, remove the petcock and seal the opening. Too much air pressure can blow out the diaphram in the petcock. You can pressurize the tank with the petcock installed, just be very careful.
Then seal off the filler opening using a heavy rag wrapped around the air nozzle. Be sure the compressor pressure is around 50-60 psi and work your way up to 100-120 psi.
This method is crude, but will work most of the time.
Hope this helps