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HomeTools & Hangar EquipmentCompression TesterEastern Technology E2A Differential Cylinder Pressure Tester
Eastern Technology E2A Differential Cylinder Pressure Tester

Eastern Technology E2A Differential Cylinder Pressure Tester

It's usually a challenge to find worn-down rings, bad intake or exhaust valves, or scored and cracked cylinders. Hunting for leaky head gaskets or stripped spark plug bushings can easily turn into an all-day project, and you have several other tasks on your maintenance to-do list.

Find all these problems quickly and efficiently with one of Eastern Technology's E2A Differential Cylinder Pressure Testers. Featuring a Slow Fill Valve, a heavy-duty regulator and gauges, and an extra-long high pressure hose, this tester starts saving you time and money the first time you power it up.

Eastern Technology's E2A won't force you to make repeated pressure adjustment. For added convenience, all connections are quick-disconnect. And with an 18-millimeter plug adapter and a set of complete instructions with every unit, this pressure tester can help you become more efficient during maintenance and repair operations.

Based on the above description, it's safe to say the E2A tester has passed our high-quality standards and is near certain to match yours as well.

Read the Instruction Manual.

Warning: This device is for use with aircraft by qualified A.P. Technicians only. All aircraft tests should be performed by two technicians. Air pressure can cause the propeller to rotate suddenly and without warning. It is not possible for one individual to safely perform these tests on aircraft.

If you are testing a certified aircraft engine, perform Master Orifice Test. See Master Orifice manufacturer’sdocumentation for procedure.

  • Run engine until it reaches normal operating temperature.
  • Remove the most accessible spark plug from each cylinder.
  • Set the Slow Fill Valve to the Off position; handle vertical and pointing down.
  • After making sure the Slow Fill Valve is Off, connect an air source to the tester, via the male quick connect fitting. Air source must be at least 90 PSI.
  • Pull Pressure Regulator knob to unlock, and adjust so the left hand gauge reads 80 PSI.


  • Hand tighten Test Adapter, with O Ring and hose, into cylinder under test.
  • Place a thumb over the end of the hose fitting and rotate the prop until the piston’s compression blows thumb off hose end. This will place the female quick connect fitting.
  • Connect the hose from the cylinder under test to the tester via the female quick connect fitting.
  • Slowly open the Slow Fill Valve approximately 1/8 Turn (3 or 4 tick marks), until moderate resistance is felt at the prop. Carefully rotate the prop back and forth through TDC until a positive detent is felt, and the air pressure holds the prop at Top Dead Center.

    Warning: Cylinder pressure will slowly rise to 80 PSI, and prop may rotate. Exercise caution.

  • Open the Slow Fill Valve completely; handle horizontal, parallel to the Pressurize Label.
  • If necessary, readjust the regulator to 80 PSI at the left hand gauge.
  • Read the relative pressure in the cylinder under test, at the right hand gauge.

    To Test Another Cylinder

  • Set the Slow Fill Valve to the Off position, and allow the cylinder pressure to bleed off. The right hand gauge will slowly return to zero. There is no need to turn down the regulator pressure.
  • When the right hand gauge reads to zero, with the Slow Fill Valve still closed, remove the test hose from the female quick connector.
  • Remove the Test Adapter from the cylinder just tested, and hand tighten it into the next cylinder.
  • Repeat the OPERATION procedure, listed above.

    Ambient barometric pressure can significantly alter differential pressure readings. Good practice indicates that a Master Orifice Test be run every day, and preferably prior to every engine test. Always run a Master Orifice Test if an engine shows marginal readings, if noticeable weather changes occur, or if ground level altimeter settings change. Refer to the instructions and specifications provided with your Master Orifice, for proper procedure.

    All cylinders will exhibit a certain amount of leakage due to standard engine clearance and normal wear; no cylinder is expected to maintain a perfect 80 PSI. It is important that all cylinders show relatively consistent readings. Good judgement should be used as to the allowable tolerance between cylinders. Always consult the manufacturers’ engine specifications.

    By listening for escaping air at key engine locations, you can generally determine the source of low pressure readings:

  • Air Escaping from Carburetor Intake: Indicates Leaking Intake Valve
  • Air Escaping from Exhaust System: Indicates Leaking Exhaust Valve
  • Air Escaping from Crankcase Breather: Indicates Defective Rings
  • Air Escaping from Radiator: Indicates Defective Head Gasket or Cracked Head/Block
  • Warranty
    Eastern Technology Corporation agrees to repair or replace any of its products (parts and labor) if there is a defect in materials or workmanship within one year of the date of purchase. Eastern Technology Corporation limits its obligation to repair or replacement, the choice of which is at its sole discretion. This warranty does not apply to equipment that has been damaged by accident, negligence, or misuse, or altered or modified in any way.
    Eastern Technology E2A Aircraft Engine Differential Cylinder Pressure TesterView DetailsEnable JS
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    Eastern Technology E2A-1000 Aircraft Engine Differential Cylinder Pressure TesterView DetailsEnable JS
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    $91.80 (Each)
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