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Old 01-23-2013, 07:52 PM
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350 sticking lifter......cant find it

Im pretty sure its a stuck lifter. has the sewing machine sound and gets louder with rpm changes.

changing the oil did nothing. engine cleaner did nothing.

i used a tall screwdriver to hear harmonics all over both valve covers and all intake runners. Ive been able to pinpoint these before but cant find this one.

pretty sure its not a rod knocking.

ive checked all over the motor just to see if i can find it.

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Old 01-23-2013, 08:01 PM
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Quote:
Originally Posted by glhx View Post
Im pretty sure its a stuck lifter. has the sewing machine sound and gets louder with rpm changes.

changing the oil did nothing. engine cleaner did nothing.

i used a tall screwdriver to hear harmonics all over both valve covers and all intake runners. Ive been able to pinpoint these before but cant find this one.

pretty sure its not a rod knocking.

ive checked all over the motor just to see if i can find it.
Check closely for an exhaust header leak...
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Old 01-23-2013, 08:04 PM
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i checked all the exhaust ports for harmonics and found nothing, it still has manifolds on it. it is way higher clicking than an exhaust leak....from what i can tell its closr to the rear of the engine...behind the carburetor. but listening internally i dont hear anything but smooth engine.
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Old 01-23-2013, 08:20 PM
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Might want to check that the distributor isn't bottoming on the oil pump push rod. More here.

Check for the rotor hitting the inside of the cap or the teeth on the distributor hitting the pick up coil assembly. This is right under the mechanical advance plate.
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Old 01-23-2013, 08:39 PM
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engine cleaner is used if you want to sell it!! This is your ride. you can not fix it with a bottle of junk!!!! sorry just had to add my 2 cents!!!
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Old 01-23-2013, 08:44 PM
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will check for distributor movement
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Old 01-23-2013, 08:46 PM
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A cracked flexplate can sound like that. If not the flexplate, pull the valve covers and check for loose rockers that might indicate losing a lobe or three on the cam.
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Old 01-24-2013, 02:03 PM
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Quote:
Originally Posted by glhx View Post
will check for distributor movement
Should be able to hear it if you listen against the distributor body.

For God's sake, keep the screwdriver away from the moving parts! It'll go through your skull like a knife through hot butter. Much, much better to use a length of rubber fuel hose... or a mechanic stethoscope.
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Old 01-24-2013, 03:08 PM
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i think i found it. at maybe the #2 cylinder. its still hard to tell for sure. last time i did this it was obvious. this time its really loud on the outside but kind of quiet on the inside of the engine with the screwdriver pressed against the intaske,,,i cant even hear it in the valve cover
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