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Old 03-27-2011, 10:09 PM
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How do I tell if these hydraulic lifters are bad?

So these hydraulic lifters I have, some of mechanisms compress easily when I push in them by hand, others won't budge. Should they all be replaced? The engine hasn't run in a few years, maybe they will loosen up once some horsepower has been thrown at them?

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Old 03-28-2011, 12:47 AM
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Some of them feel loose because the oil has bled out of them during the long time they sat. They will pump back up hard when the engine is run and the oil system is pressurized and fills the lifters back up. Only the ones that were under valves that were slightly of fully open will be bled down, the ones not being lifted at the point in the firing order the engine stopped will still be full of oil and pumped up hard.
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Old 03-28-2011, 03:13 PM
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Quote:
Originally Posted by Silver Surfer
So these hydraulic lifters I have, some of mechanisms compress easily when I push in them by hand, others won't budge. Should they all be replaced? The engine hasn't run in a few years, maybe they will loosen up once some horsepower has been thrown at them?
If that's the only issue then Eric is correct but are they out of the engine? If so and you didn't keep them in order with the exact cam lobe they came off buy new ones and inspect the cam lobes for possible wear while you're at it. If the lifters are flat on the bottom or slightly dished, buy new ones and a cam to go with them. They should have a slight "dome" to the bottom when you but a straight edge across them. If they don't they have started to fail and the cam probably has too.
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