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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Bolts shearing—High Pressure Fuel Pump
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<blockquote data-quote="TwizzleStix" data-source="post: 1590880" data-attributes="member: 32095"><p>Yep, your technician is full of shit. Camshafts do not "twist" because there literally isn't a leverage point that would let it happen. What happened is that he ****** up the phaser installation with the cam timing off a bit. </p><p></p><p>Indeed the HPFP has no less than 40 specific parameters for correct operation in time with the crankshaft and thusly the camshaft. The camshaft actually being "out of time" just enough to screw up the HPFP pump-pressure timing. The timing error may cause the HPFP to actually be in a "hydraulic lock" for a few milliseconds when in operation. The result is that the HPFP bolts and/or the housing fails under the pulsing load after a time. It's a fatigue failure rather than an instantaneous overload.</p><p></p><p>So, when your technician finally goes back through the cam timing process, the "problem" will mysteriously go away. This impossible problem is why the Ford Engineer asked for some specific actions. One of which was to re-check cam timing which is "now" out because the camshaft "twisted" Not a chance in hell. Simple human error. It's the likeliest cause of practically every "mysterious" problem.</p></blockquote><p></p>
[QUOTE="TwizzleStix, post: 1590880, member: 32095"] Yep, your technician is full of shit. Camshafts do not "twist" because there literally isn't a leverage point that would let it happen. What happened is that he ****** up the phaser installation with the cam timing off a bit. Indeed the HPFP has no less than 40 specific parameters for correct operation in time with the crankshaft and thusly the camshaft. The camshaft actually being "out of time" just enough to screw up the HPFP pump-pressure timing. The timing error may cause the HPFP to actually be in a "hydraulic lock" for a few milliseconds when in operation. The result is that the HPFP bolts and/or the housing fails under the pulsing load after a time. It's a fatigue failure rather than an instantaneous overload. So, when your technician finally goes back through the cam timing process, the "problem" will mysteriously go away. This impossible problem is why the Ford Engineer asked for some specific actions. One of which was to re-check cam timing which is "now" out because the camshaft "twisted" Not a chance in hell. Simple human error. It's the likeliest cause of practically every "mysterious" problem. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Bolts shearing—High Pressure Fuel Pump
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