Hydraulic Lifters - Team Camaro Tech
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post #1 of 5 (permalink) Old Apr 15th, 04, 04:21 PM Thread Starter
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Gary
 
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I was setting the rockers on my 427, and I noticed that some of the hydraulic lifters could be compressed fairly easily. However, some were so stiff that I couldn't compress them, no matter how hard I pushed on the push rod side of the rocker.

Is this normal?
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post #2 of 5 (permalink) Old Apr 16th, 04, 01:19 AM
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I would think so. The lifter will bleed down to a point, then once the holes are misaligned, it will become a solid lifter, or it might have bottomed out. Also, if the inner body is worn, there will be a lot of bypass between it and the outer body.

This is why one adjusts hydraulic valves with the engine running. This allows the lifter to fill with oil and maintain '0' lash.

There is a time limit on lifter bleed down. There is a tool with a weighted head and a plunger. One sets the lifter into its future oil, pump it up with a pushrod to fill it. Then place it underneath this weight and time it. If the lifter did not meet this time requirement, then, the lifter is determined bad, replace it. Haven't seen one of these tools in eons.

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post #3 of 5 (permalink) Old Apr 16th, 04, 05:31 PM Thread Starter
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The lifters only have about 2 hours run time. They might be worn, but I doubt it.
Also, I checked them, and the inner body is up against the keeper, as it should be. in other words, it was not bottomed out.
If they were pumped up, I would have thought they would bleed down with time. Engine was not run since November.
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post #4 of 5 (permalink) Old Apr 18th, 04, 08:01 AM
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Unreal,
I bet if you turn the engine until the valve is open on the lifter in question, and let it sit for a while with valve spring pressure on it, it will end up bleeding down. Thats probably why some of them are already "soft", they were probably the ones with the valves open while the engine was sitting. As long as a lifter has oil in it, and not a lot of pressure agianst it, it will stay "hard".
Hope this helps,

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post #5 of 5 (permalink) Old Apr 18th, 04, 03:25 PM Thread Starter
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Thanks, Bill. I feel better, now.
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