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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: 1981892" data-attributes="member: 69868"><p>Another observation of the phaser part, both old and new, is in the backing plate with the loc-pin hole in it…. With this plate as installed and facing the engine from the front of the truck, the lock-pin filling/draining oil channel is counter clockwise of the actual hole. I think this means the channel would be exposed to the advancing cavity oil pressure or lack of pressure. So when we start the engine and the cam rotor is mid-locked, advance pressure is the mechanism by which the pin is unlocked. Retard pressure would not unlock the pin. What I’m trying to figure out is how PCM code actually controls the lock pin. From what I can see, the VVT control valve is a 4 port widget. One port is oil in. That port receives pump pressure. The pump port can be directed to either the advance or retard ports. Lastly the 4th port is a drain port. When advancing, the retard cavity must give back oil to the sump. So when the advance port is open, the drain port is open to the retard cavity. When the retard port is open, the advance cavity must give back oil to the sump through the drain port. In so doing, the advance cavity is lower pressure and thus the lock pin hole is also lower pressure. Keeping the lock pin from falling into the hole while retarding sounds tricky. The bias spring may play a role but I don’t know how it’s biased. It’d be easy to tell if I had a VVT in my hands. It sounds like some pretty clever coding though. Like really hard to pull off.</p></blockquote><p></p>
[QUOTE="spack, post: 1981892, member: 69868"] Another observation of the phaser part, both old and new, is in the backing plate with the loc-pin hole in it…. With this plate as installed and facing the engine from the front of the truck, the lock-pin filling/draining oil channel is counter clockwise of the actual hole. I think this means the channel would be exposed to the advancing cavity oil pressure or lack of pressure. So when we start the engine and the cam rotor is mid-locked, advance pressure is the mechanism by which the pin is unlocked. Retard pressure would not unlock the pin. What I’m trying to figure out is how PCM code actually controls the lock pin. From what I can see, the VVT control valve is a 4 port widget. One port is oil in. That port receives pump pressure. The pump port can be directed to either the advance or retard ports. Lastly the 4th port is a drain port. When advancing, the retard cavity must give back oil to the sump. So when the advance port is open, the drain port is open to the retard cavity. When the retard port is open, the advance cavity must give back oil to the sump through the drain port. In so doing, the advance cavity is lower pressure and thus the lock pin hole is also lower pressure. Keeping the lock pin from falling into the hole while retarding sounds tricky. The bias spring may play a role but I don’t know how it’s biased. It’d be easy to tell if I had a VVT in my hands. It sounds like some pretty clever coding though. Like really hard to pull off. [/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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