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Cylinder Head & Short Block: 4G63 cams, valvetrain, pistons, rods, stroker kits, 6-bolt swaps, hybrids, etc. Read this Forum's Strict Guidelines.

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Old 05-31-2007, 11:31 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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Bad lifters, what happens? (not a tick question)


If your Timing belt is still as tight as It was when replaced 2 yrs ago, then why upon start-up does it sound like someone wants out of my valvecover with a hammer? It sounds like VIOLENT lifter clatter(even after letting car sit 24hrs it still did it on start-up and with RPMs). Looked under VC and no damage/things flying around. I know to check the timing marks etc but I really think its a botched lifter, how do I go about checking them? Thankyou in advance!!

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Old 06-01-2007, 12:50 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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Check the timing marks first.


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Old 06-02-2007, 07:19 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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i had the same problem and my intake valves were touching my pistons. Just ever so slightly. still not sure what the problem was i got new lifters valves, none were bent, springs and the head machined and my problem went away. Alot of money but took care of it all.

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Old 06-02-2007, 01:56 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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Thanks guys, lets say the timing is fine. How do I check for a bad lifter from looking at them w/ VC off? Thanks again.
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Old 06-02-2007, 07:35 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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You can pull them out( remove rocker's), and take a paper clip, and stick it down the whole in the top of the lifter( used to get oil to the rocker's), with it in you should be able to depress the lifter's all the way. If they don't go down then they need to be replaced.


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Old 06-09-2007, 12:19 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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I try to wiggle the rockers, push down on them. That would show if a lifter is not holding pressure. Of course about half the lifters are compressed by the lobes at any one time, so you're not learning much about those.


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Old 06-09-2007, 02:09 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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Timing can jump without the belt tension being visibly changed. Inspect the entire belt for damaged or missing teeth.
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