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General Minitrail Talk
Projects/Builds
71K0 just brought out of a LOOONNGG storage.
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<blockquote data-quote="69ST" data-source="post: 175077" data-attributes="member: 5"><p>A lot of these engines develop valvetrain noises at, various stages, after a rebuild. Most commonly, they manifest as engine temp changes. Oftentimes, they go away with mileage. IMHO, it has to do with unwanted, lateral, rocker arm movement. The rocker arms and cam can wear over time. Inadvertently swapping I&E rockers will give you a mismatched wear pattern. The adjusters can wear asymmetrically, which is even more likely. </p><p></p><p>While the rocker cover if removed, try wiggling the rocker arm. You'll probably be able to create a ticking sound using nothing more than fingertips. Try temporarily tightening the valve lash...to the absolute limit...and see if the noise is diminished, or goes away. If it does, you might try throwing new lash adjusters at it. If there's no effect, time to look deeper. </p><p></p><p>Ticking noises can be a <em>MoFo</em> to accurately diagnose, as they resonate throughout the motor. I've run across situations where the issue was caused by the piston...fresh rebuild. ~4 years ago, I ran across a few basackward pistons. Literally, flipping them 180-degress eliminated the noise and caused no problems despite the spark plug & valve reliefs being in the wrong places. Needless to say, those pistons were replaced, problem(s) solved. However, more times than not, ticking noises result from connecting rod wear and you know what-all that involves.</p></blockquote><p></p>
[QUOTE="69ST, post: 175077, member: 5"] A lot of these engines develop valvetrain noises at, various stages, after a rebuild. Most commonly, they manifest as engine temp changes. Oftentimes, they go away with mileage. IMHO, it has to do with unwanted, lateral, rocker arm movement. The rocker arms and cam can wear over time. Inadvertently swapping I&E rockers will give you a mismatched wear pattern. The adjusters can wear asymmetrically, which is even more likely. While the rocker cover if removed, try wiggling the rocker arm. You'll probably be able to create a ticking sound using nothing more than fingertips. Try temporarily tightening the valve lash...to the absolute limit...and see if the noise is diminished, or goes away. If it does, you might try throwing new lash adjusters at it. If there's no effect, time to look deeper. Ticking noises can be a [I]MoFo[/I] to accurately diagnose, as they resonate throughout the motor. I've run across situations where the issue was caused by the piston...fresh rebuild. ~4 years ago, I ran across a few basackward pistons. Literally, flipping them 180-degress eliminated the noise and caused no problems despite the spark plug & valve reliefs being in the wrong places. Needless to say, those pistons were replaced, problem(s) solved. However, more times than not, ticking noises result from connecting rod wear and you know what-all that involves. [/QUOTE]
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General Minitrail Talk
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71K0 just brought out of a LOOONNGG storage.
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