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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Cam Phaser Issue & Warranty Info
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<blockquote data-quote="FordTechOne" data-source="post: 1980775" data-attributes="member: 35543"><p>Essentially that is correct, but on shutdown the oil in the phaser does not drain back immediately. That is why a sprocket with a failed locking mechanism only rattles after a cold soak, and not after auto start/stop events or between warm starts.</p><p></p><p></p><p>The programming changes VCT duty cycle while the engine is running. The prior calibration was running the VCT units near the locking cavity threshold. That resulted in wear between the pin and cavity, which is the tapered wear pattern seen in your picture. To your point about keeping the locking pin in the fully unlocked position at idle, the new calibration increases oil pressure at idle for that reason. </p><p></p><p></p><p>Since it prevents wear from developing, it is critical to longevity for both the prior and current parts.</p><p></p><p>They’re the same internally. People started rumors about that because they appear different; the only reason for the appearance difference was a change in supplier.</p></blockquote><p></p>
[QUOTE="FordTechOne, post: 1980775, member: 35543"] Essentially that is correct, but on shutdown the oil in the phaser does not drain back immediately. That is why a sprocket with a failed locking mechanism only rattles after a cold soak, and not after auto start/stop events or between warm starts. The programming changes VCT duty cycle while the engine is running. The prior calibration was running the VCT units near the locking cavity threshold. That resulted in wear between the pin and cavity, which is the tapered wear pattern seen in your picture. To your point about keeping the locking pin in the fully unlocked position at idle, the new calibration increases oil pressure at idle for that reason. Since it prevents wear from developing, it is critical to longevity for both the prior and current parts. They’re the same internally. People started rumors about that because they appear different; the only reason for the appearance difference was a change in supplier. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Cam Phaser Issue & Warranty Info
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