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My Ingersoll Rand SS5 pump overheats and locks up

Checked oil slingers and they are intact. Noted cylinders seem to be very dry. Cylinders and pistons are a golden color but not burnt. Checked reed valves and all look good and function as they should. Checked check valve going into tank and it functions. Was sticking but freed up with a little cleaner. Tightened belt. Compressor will run one cycle but starts slow down around 100 psi but will make it to 130psi and shut off. Cylinder temps are aound 380-400 degrees. Head temps are well over 400 degrees. Next cycle the compressor will slow down and come to a complete stop before reaching 100 psi. Smoke coming from air intake. Let cool and pulled thru by hand. Hard to turn at top of the stroke. Started compressor and sprayed PB Blaster into intake and compressor sped up for a few seconds but then slowed back down to a full stop. Suspect incorrect clearance between pistons and cylinders not allowing for expansion? Damaged piston rings not allowing oil to get to pistons and cylinders? Looking for suggestions. Anyone have specs on cylinder wall to piston clearance?

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  • 5 more comments 
  • Anthony Royal Jan 09, 2013

    Belt was tensioned prior to running. OO cord no more than 6 ft running into circuit breaker box.

  • Anthony Royal Jan 09, 2013

    Ran until 50 lbs air in tank. Loosened nut to copper line from compressor to check valve. No air escaped from tank. Worould seem to indicate check valve is working.

  • Anthony Royal Jan 09, 2013

    Will try running with discharge line disconnected.

  • Anthony Royal Jan 09, 2013

    When pump stops, electric motor is still trying to turn pump. Trying to turn pump by hand is almost impossible fora t least 5 minutes. Then very difficult

  • Anthony Royal Jan 11, 2013

    Problem found. Completely disassembled pump and found front piston has a one inch wear band just below the oil rings. Pistons are aluminum and cylinders are steel. When heated aluminum expands faster than iron. The band indicates either the piston skirt is out of tolerance and/or the cylinder is out of spec. The heat generated during compression is causing the piston to expand and lock in the cylinder. The out of tolerance is small as once the cylinder cools for a minute or so, the piston/cylinder interference lessens. All oil rings, passages, and slingers are clear and intact. Contacting IR for specs on the cylinder walls and piston skirt to see what needs to be repaired or replaced.

  • chada303
    chada303 Apr 03, 2013

    What did IR say? I am having the same issue, any help appreciated

  • Denny Morrow Aug 26, 2013

    I have the exact same issue. Did you find the solution?

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SOURCE: My Sears 1 HP compressor motor starts to slow down

IF IT HAS BELTS THE BELTS COULD HAVE BEEN LOOSE AND SLIPPING.. MOTOR COULD BE GETTING HOT DUE TO TOO SMALL OF CORD OR SMALL GAUGE DROPCORD. INTANK CHECK VALVE COULD BE GETTING CLOGGED NOT ALLOWING AIR TO PASS THRU IT. UNHOOK DISCHARGE LINE FROM HEAD TO THE TANK, THIS WILL ALLOW PUMP TO RUN UNDER NO STRESS AND SEE WHAT HAPPENS.

Posted on Apr 03, 2009

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