Without current (duty cycle pulses) introduced in the coil, (being unplugged) the spring is subjected to no force by oil pressure or flow and simply moves the plunger back to base position - eXcept sludge / carbon or junk or crushed screens obstructing plunger movement. ![]() ![]() The solenoid coil need ONLY to overcome the resistance of the spring to move the plunger and re-direct oil flow. A million pounds of pressure into the center port applies pressure pushing equally on both ends of the chamber (in both directions at the same time) and will NOT move the plunger either way. Oil 'enters' a spool valve (like VCT Solenoids) through the center port - into a small chamber that is terminated (by dead end) at both ends. And clearly that is the narrative advanced by the video - and that is my objection. Certainly the VCT solenoids are frequently the source of problems - especially if they become sticky from age or poor oil change maintenance and do not respond to their duty cycle control signal.īut a spool valve spring (no matter how weak) can never cause oil to flow or seep past the valve and effect the advance/retard position of phasers. ![]() A good video, but I had to take exception to the technical narrative.
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