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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="spack" data-source="post: 1985416" data-attributes="member: 69868"><p>Regarding my post #52. I picked up used MLZ and HL3Z...-CD exhaust phasers and took them apart. Neither showed wear, but I don't know their respective histories .... I learned something taking them apart and I don't want to be the source of bad info so some corrections. The post is mostly correct in concept BUT... The parked position is fully advanced. It's not a mid-locking phaser as I stated. It is the action of unlocking the phaser with retard direction (not advance direction) oil pressure which, in the previous incarnations of that phaser, may have caused the wear we see, since the oil pressure will try to move the phaser while it also moving the lock pin out. Since bias spring helps to keep it advanced while the pin is being moved, it should help reduce the shear force on the lock pin hole.</p><p></p><p>Differences in MLZ vs H3LZ. The MLZ vane depth is increased. So less oil pressure will move the rotor. The bias spring has a higher spring constant in accordance. The lock pin hole is completely passive with regard to oil channeling. In the HL3Z part, the lock pin hole has channeling from the retard chamber to the bottom of the lock pin hole. On the MLZ part this is done from the back of the lock pin and then around the pin and into the hole.</p><p></p><p>I'm sure this is of little interest, but I'll fix the mistakes in $52 regardless. Or delete it altogether. Might be best if I keep quiet.</p></blockquote><p></p>
[QUOTE="spack, post: 1985416, member: 69868"] Regarding my post #52. I picked up used MLZ and HL3Z...-CD exhaust phasers and took them apart. Neither showed wear, but I don't know their respective histories .... I learned something taking them apart and I don't want to be the source of bad info so some corrections. The post is mostly correct in concept BUT... The parked position is fully advanced. It's not a mid-locking phaser as I stated. It is the action of unlocking the phaser with retard direction (not advance direction) oil pressure which, in the previous incarnations of that phaser, may have caused the wear we see, since the oil pressure will try to move the phaser while it also moving the lock pin out. Since bias spring helps to keep it advanced while the pin is being moved, it should help reduce the shear force on the lock pin hole. Differences in MLZ vs H3LZ. The MLZ vane depth is increased. So less oil pressure will move the rotor. The bias spring has a higher spring constant in accordance. The lock pin hole is completely passive with regard to oil channeling. In the HL3Z part, the lock pin hole has channeling from the retard chamber to the bottom of the lock pin hole. On the MLZ part this is done from the back of the lock pin and then around the pin and into the hole. I'm sure this is of little interest, but I'll fix the mistakes in $52 regardless. Or delete it altogether. Might be best if I keep quiet. [/QUOTE]
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Ford F-150 Raptor General Discussions [GEN 2]
Cam Phaser Issue & Warranty Info
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