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This article is under construction

 

 

Using the steps outlined in the above slide, we are going to discuss why, how and when to bleed and/or replace a hydraulic valve lifter in a SUBARU 2.2L engine.

 

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Symptoms are listed above. The engine sound is often described as a
sewing machine noise.
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The absolute FIRST thing to be checked is the oil level.  If oil is low, air may have been introduced into the lubricating system finding its way into the lifter. *Air and or any gas, will compress whereas oil or liquid will not, so air in the system will causing the lifter to collapse and thus clatter as described.
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 *If the oil level is found to be excessively low, top it off, start the engine, bring the car to operating temperature, then drive it for THREE miles at 3,000 RPM. This will drive any air out of  the system.
If after the drive, the noise can no longer be detected, let the car set overnight and retest. If the noise does not return, you are done. However, if the noise does not go away, or if it comes back, you are faced with a defective valve lifter that must be bled or changed.
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Many methods can be employed to isolate which side of the engine the lifter noise is coming from. Usually the human ear is adequate for this part of the diagnoses. A long metallic device, such as a large screwdriver placed blade to the valve cover and the handle pressed to the ear helps. However, depending on the sophistication of the equipment and the skill level of the technician using it, the individual noisy lifter and/or lifters can often be identified before any disassembly starts, which may save time in the steps to come.

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On the side of the engine that the noise is coming from, the valve cover (rocker cover as indicated in illustration) must first be removed. It is held in place by THREE - 10mm bolts.
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Once the valve cover has been removed, a test can be performed to determine the collapsed lifter or lifters. With firm pressure, push on the potion of the rocker arms that contact the lifters. If a sponginess or total collapse is found in any lifter, it must be bled or replaced.

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To get to the valve lifters, the rocker assembly must be removed. To prevent damage to the cam / valve train, each of the EIGHT - 10mm bolts must be loosened in a precise sequence.

 (see torque chart in above illustration above)

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