GEN 2 Bolts shearing—High Pressure Fuel Pump

[TwizzleStix]

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.

 

[isis]

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.

This is much better stated than I could’ve put it but I agree. The only way it was ‘twisted’ was if it started that way. 58k road miles says otherwise. Somebody done ****** it up.

 

[TwizzleStix]

…... Somebody done ****** it up.

No doubt about it.

 

[Proflyer]

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.

Agreed. I have no idea how a camshaft could twist...it would need something to freeze up on it when under load, and then that'd likely make a bunch of other parts in there go kaboom.

They claim the timing is 'locked' in place during the phaser install so the cams can't move, but I suspect the same that the cam in question moved and he didn't notice, or he didn't check timing when putting it back together. Who knows. Whatever happened must have damaged the cam, or else they wouldn't be waiting on a new one.

 

[GordoJay]

... Whatever happened must have damaged the cam, or else they wouldn't be waiting on a new one.

Or this way they don't have to admit the error and pay for it with uncompensated tech time. FMC pays instead for a whole new camshaft and the labor too. Win for them, lose for FMC, lose for you since you're out of your truck. But it's hard to imagine a dealer stooping that low.

 

[EricM]

Gen 2 Raptor EB engine's camshafts are not a solid piece of metal like camshafts have traditionally been for the last 100 years. It is possible for them to fail in a mode where it's "twisted". Not saying that's the reasons for this bolt issue- but it is possible and people on this board have had cams fail due to the new non-solid design.

 

[Proflyer]

Gen 2 Raptor EB engine's camshafts are not a solid piece of metal like camshafts have traditionally been for the last 100 years. It is possible for them to fail in a mode where it's "twisted". Not saying that's the reasons for this bolt issue- but it is possible and people on this board have had cams fail due to the new non-solid design.

Interesting. I didn't know that, but it makes sense. The service writer and tech are both seasoned and seem to be stand up guys. I don't really care what happened at this point...I just want it fixed!

 

[Proflyer]

Got the truck back! Cam showed up yesterday and they got it all back together. Spoke to the tech who showed me the cam (forgot to get pics). It's twisted almost a half inch. Plus, the new cam is a superseded part number. Of the 4 cams in the truck, that's the only one with a new part number. Plus, they've had two more show up with the same issue. They're both just regular EBs tho not Raptors. Something is fishy...but it's running great!!

 

[MudLovingFJ]

Plus, they've had two more show up with the same issue. They're both just regular EBs tho not Raptors. Something is fishy...but it's running great!!

Wonder if they had phaser replacements done, and by the same tech. If so, we have a definite answer.

 

[EricM]

Hollow multipiece camshafts are just a ****** idea, period.