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Message: [QUOTE="Patrick Feeley, post: 844967, member: 2142"] When the motor is running and there is oil pressure, some of that pressure could remain inside the hydraulic lifter(s), unless of course the engine just happened to stop in the 11 o'clock position. When the rocker/pushrod is removed, the lifter will expand (or "jack") due to the pressure trapped inside. I've never traced all the oil passages or anything, but when the engine is in that position, the lifter passages must line up allowing the oil (pressure) to bleed off. The positioning is specified in the service manual to avoid engine damage. Not sure that is all that helpful. Cheers! [/QUOTE]

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