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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
FordTechOne recurring cam phaser rattle
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<blockquote data-quote="nighthorse_raptor" data-source="post: 1927321" data-attributes="member: 32655"><p>Here is a video showing disassembly of two different style VCT units/"phasers" - it shows the ML3Z-A (the one with the cover) has a different shape for the lock-out pin and oil passages versus the HL3Z-CD (the one with the external spring exposed). It seems that is not only an appearance change - you can see the failure point of the the HL3Z lock-out pin hole design and how it is revised in the ML3Z part.</p><p></p><p>[MEDIA=youtube]7r_1-SQ3jDk[/MEDIA]</p><p></p><p>From doing a parts look-up for a 2018 Raptor, it lists both HL3Z-CD and ML3Z-A. When doing the same look-up for a 2021 and 2023 Raptor, it only lists ML3Z-A. Given that the newer Raptors (2021+) have not had widespread reporting of VCT cold start rattle, this leads me to speculate that the ML3Z-A *may be less prone to lock-out pin failure and cold start rattle due to a change in the lock-out pin hole design.</p><p></p><p>*Limited reporting of phaser issues for now on the newer trucks with ML3Z-A could also be attributed to lower engine hours and mileage.</p></blockquote><p></p>
[QUOTE="nighthorse_raptor, post: 1927321, member: 32655"] Here is a video showing disassembly of two different style VCT units/"phasers" - it shows the ML3Z-A (the one with the cover) has a different shape for the lock-out pin and oil passages versus the HL3Z-CD (the one with the external spring exposed). It seems that is not only an appearance change - you can see the failure point of the the HL3Z lock-out pin hole design and how it is revised in the ML3Z part. [MEDIA=youtube]7r_1-SQ3jDk[/MEDIA] From doing a parts look-up for a 2018 Raptor, it lists both HL3Z-CD and ML3Z-A. When doing the same look-up for a 2021 and 2023 Raptor, it only lists ML3Z-A. Given that the newer Raptors (2021+) have not had widespread reporting of VCT cold start rattle, this leads me to speculate that the ML3Z-A *may be less prone to lock-out pin failure and cold start rattle due to a change in the lock-out pin hole design. *Limited reporting of phaser issues for now on the newer trucks with ML3Z-A could also be attributed to lower engine hours and mileage. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
FordTechOne recurring cam phaser rattle
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