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Training and Consulting


Hydraulic Pushrods for
Cooper-Bessemer Engines

Filling and Bleeding Instructions for Cooper GMW

  1. Be sure the lifter units and barrels do not contain any foreign matter.
  2. Clamp the lifter upright in a vise below the outer tube on the bottom 2" of the pushrod. Slip the inner barrel out.
  3. Remove inner barrel (Driver) and fill the reservoir with 10w-30 weight oil or equivalent. Other oils may be used in special cases. (Check with a CECO sales representative.)
  4. Insert the inner barrel into the pushrod oil reservoir and work it up and down to make sure the lifter unit is seated.
  5. Insert a piece of clean bare wire or rod, long enough to reach the lifter unit ball check, through the hole in the top of the cap. (NOTE: The wire must not be larger than 1/8" in diameter.) While holding the check valve open pull down on the pushrod cap until the lifter bottoms out. Release and repeat this several times until when you remove the bleed wire there will be "NO" downward movement on driver of the pushrod.
  6. If the lifter is to be stored for any length of time, it is necessary to seal the upper and lower barrels with tape and plug the upper Teflon insert. If possible, store in an upright position.
  7. CECO Magnum Hydraulic Pushrods should be inspected once a year. If the oil is contaminated, wash out the pushrod with a clean solvent. Replace with clean oil. Magnum units must be kept clean.

Installation and Maintenance

  1. Remove the rocker arm and replace the adjusting screw (if supplied) with CECO adjusting screw Check rocker arm bushing for proper clearance.
  2. Remove the pushrod hold-down spring and bracket and remove the existing pushrod.
  3. Install the CECO Magnum pushrod and replace the hold down spring and bracket.
  4. Replace the rocker arm.

    NOTE: When tightening the spring hold down bracket, be sure the pushrod is in the center.

Adjustments

  1. Turn the engine until the #1 cylinder pushrod is on the low cam.
  2. Turn the pushrod, adjusting the screw down, until the rocker arm tappet makes contact with the fuel valve. Now turn the adjusting screw 1 turns down and lock the jam nut.
  3. Proceed to the next cylinder, in firing order, and repeat the above procedure.

    NOTE: After you have made the correct setting, you may notice as you turn the engine to get another cylinder on low cam, one of the pushrods has bled all the way down. This is normal, because as you turn the engine you have stopped the pushrod on high cam. When the engine is running, the pushrod will go back to the correct setting.

 
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