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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Engine rattle/noise at start up
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<blockquote data-quote="FORZDA 1" data-source="post: 1291541" data-attributes="member: 26637"><p>Ok, that is LOUD and no question it is valve train related and corrected by oil pressure. The phaser must be bleeding down overnight similarly to old hydraulic lifters. The old lifter clatter at startup was due to poor maintenance and old school oils that would leave terrible deposits when allowed to cool and harden in small spaces. </p><p></p><p>After viewing photos of the Ford phasers, it appears that the external clock spring needs to be much stronger to hold the phaser in position when no oil pressure is present. In any case, the noise indicates the phaser is banging back and forth driven by valve spring pressure until the oil pressure comes up to force and hold it in position. </p><p></p><p>I'm surprised the aftermarket hasn't jumped right on that shit and made some replacements. I suppose there just aren't enough failures to drive them into production. There are several better OEM designs on the market (Mazda is one), so I'm surprised that Ford, that owned a big chunk of Mazda for years, hasn't come up with a better design. Maybe patents in the way?</p></blockquote><p></p>
[QUOTE="FORZDA 1, post: 1291541, member: 26637"] Ok, that is LOUD and no question it is valve train related and corrected by oil pressure. The phaser must be bleeding down overnight similarly to old hydraulic lifters. The old lifter clatter at startup was due to poor maintenance and old school oils that would leave terrible deposits when allowed to cool and harden in small spaces. After viewing photos of the Ford phasers, it appears that the external clock spring needs to be much stronger to hold the phaser in position when no oil pressure is present. In any case, the noise indicates the phaser is banging back and forth driven by valve spring pressure until the oil pressure comes up to force and hold it in position. I'm surprised the aftermarket hasn't jumped right on that shit and made some replacements. I suppose there just aren't enough failures to drive them into production. There are several better OEM designs on the market (Mazda is one), so I'm surprised that Ford, that owned a big chunk of Mazda for years, hasn't come up with a better design. Maybe patents in the way? [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Engine rattle/noise at start up
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