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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: 1291547" data-attributes="member: 26637"><p>The oil-pressure tensioned timing chains, like you say, are nothing new. HOWEVER, they do have a ratchet mechanism in them that keep the tensioner from ever allowing the chain to "loosen". They do NOT depend on oil pressure to stay in their "tensioned" place. Camshaft timing actuators use a VERY strong spring to hold them in a neutral position when the engine is off (no oil pressure). Most are very short springs inside the housing, but Ford's are exposed on the outside.</p><p></p><p>My Aprilia RSV4 Factory is known for some of the engines developing the cam chain startup rattle when the chain is stretched beyond the tensioner travel. If allowed to continue for long, a valve will touch a piston at high revs and the engine will break the valve and grenade. Of course, Aprilia has had several catastrophic engine problems over the years. </p><p></p><p>The Ford noise at startup that I heard in the video is nowhere near a "normal" situation. It is indicative of a faulty actuator. </p><p></p><p>The wastegate rattle however is normal because it is pulled open at startup to allow easy passage of exhaust to the cat for quicker light off. The exhaust is pulsing at low revs, so the wastegate actuator arm rattles because the is little pressure.</p></blockquote><p></p>
[QUOTE="FORZDA 1, post: 1291547, member: 26637"] The oil-pressure tensioned timing chains, like you say, are nothing new. HOWEVER, they do have a ratchet mechanism in them that keep the tensioner from ever allowing the chain to "loosen". They do NOT depend on oil pressure to stay in their "tensioned" place. Camshaft timing actuators use a VERY strong spring to hold them in a neutral position when the engine is off (no oil pressure). Most are very short springs inside the housing, but Ford's are exposed on the outside. My Aprilia RSV4 Factory is known for some of the engines developing the cam chain startup rattle when the chain is stretched beyond the tensioner travel. If allowed to continue for long, a valve will touch a piston at high revs and the engine will break the valve and grenade. Of course, Aprilia has had several catastrophic engine problems over the years. The Ford noise at startup that I heard in the video is nowhere near a "normal" situation. It is indicative of a faulty actuator. The wastegate rattle however is normal because it is pulled open at startup to allow easy passage of exhaust to the cat for quicker light off. The exhaust is pulsing at low revs, so the wastegate actuator arm rattles because the is little pressure. [/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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