Hmmmm? Thinking about the issue and the problem seems to mostly occur after the first oil change. Ford dealerships are notorious for using their bulk 5w20 oil in everything they service with no reference to the actual viscosity requirements. The 2014 Fiesta ST 1.6 turbo required 5w30 yet the dealers consistently put 5w20 in them. Same with the Focus RS that requires 5w50 and again the minimum wage goons used 5w20. It’s really hard to prove a problem caused by low viscosity oil, but the cam vvt actuators depend on the oil viscosity for accuracy. A leak-down issue is certainly internal sealing or oil vis problem.
The truck came with 5w20 in it according to my first oil analysis. I had 5w30 put in at the 1st change and 2nd. the 1st change was confirmed to have been 5w30 by analysis.
Apparently there are not a lot of non HD / Duc campaigning bikers on here. Anyone with a modern inline 4 sport bike, older H*nda V4’s, and I’m sure more out there use the same oil pressurized cam chain tensioners that we’re talking about in the Ford engines going back to at least the first Modular V8’s. These things apply tension to the cam chain using - wait for it.... Oil pressure.
Guess what you have zero of when your Raptor is off? go on, I’ll wait.
That’s right, oil pressure. However, when you start up, and the oil pump starts circulating the engine oil, within fractions of a second to a few seconds those tensioners pressurize and apply tension to the loose timing chain.
Why is it loose in the first place? Longevity, among other concerns. Timing chains are under enormous loads, especially under hard driving. A good illustration of this is going from WFO throttle and lifting or chopping the throttle on engine braking, and then back to WFO. If the chain is too tight it will loosen and wear faster as well as stress the connected parts under heavy load.
So, upon startup, OHC engines using a cam chain - some Honda V4’s used gears, another topic entirely, and they’re using an automatic adjusting, oil pressurized cam chain tensioner, there’s going to be a loose cam chain at start up.
Many of the modern sportbikes have these and there are numerous aftermarket, mechanically adjusted cam chain tensioners to address this issue. They help alleviate some of the start up noise.
That is not to say there isn’t a phaser noise going on in all cases, but, initial start up rattle resulting from oil pressurized cam chain tensioners is kind of expected. Persistent noises... Not so much. Cam chain noise should be gone in ... maybe 5 seconds?