maplelakeduckslayer

My dealer wants to check the oil pressure again.

LastResort

Lots and lots of reasons that vehicles lose power suddenly, feel free to dig through the NHTSA database and find one that they consider a safety concern.

maplelakeduckslayer

For those that had the noise come back, has anything been done to address the issue?


When they changed the timing chain TSB, the part number for the hpfp o ring changed. What are the chances that all of this is being caused by fuel leaking into the oil, exacerbating wear issues and causing oil to not hold a prime?


Mine is going back in this week, and they will be on the hook for the parts they replaced when they did the timing chain, but trying to decide if I should have them replace the hpfp and PCV valve. Mine is rattling again, IC has tons of oil in it, oil seems overfull and smells like fuel.


Just curious if a leaking hpfp could be causing all of these issues.

itguy08

That could very well be and explain why the car versions of the EB 3.5 are not affected. They use a different HPFP - Bosch vs the Hitachi on the F150.

The only question I would have is why the first chains take 30-50k to rattle and the new ones start rattling in less than 10k.

Would be interesting to see if those with the rattle also have the fuel in oil smell?

maplelakeduckslayer

Maybe putting a brand new chain on the engine puts too much strain on the pump when its used to a stretched chain, forcing even more fuel into the crankcase? Which in turn causes prime issues? A retarded engine isnt going to be pushing as much fuel into the engine...with a new chain flow goes back up, forcing more leakage? It'd be interesting to hear from someone who has the revised TSB performed with the new o ring to see if there's comes back. I don't really know the specifics on how these work, trying to learn and just tossing things out

LastResort

I can't tell for sure, but it seems like everyone who has the problem return in such a short period, didn't have everything that touches the chain replaced. So they may have work sprockets still.

maplelakeduckslayer

I paid out of pocket for everything so they were more than happy to replace anything and everything, they said the sprockets were fine supposedly. I told them I wanted to be 100% sure because I didn't want to have to open it up again. They assured me it was fine. They did replace the tensioner which is not part of the TSB that gets done to trucks in warranty. They said oil leaks past those seals and is a common cause of the issue. How about fuel in the oil eating away those seals?

LastResort

I'm no mechanical engineer, but I'm curious what they used to decided if the sprockets were OK. Is a visual inspection for worn surfaces sufficient? Or did they need measure or use a go/no-go gauge. I would assume that any seal in a motor would be good for gasoline, but maybe that's a bad assumption.

VoiceOfReason

Time to change to 0W or 5W-40.

Replacing the timing components addresses the symptoms and not the root cause. After your next oil change (using your current oil), track how long it takes for the rattle to consistently show up.

F150SGFX4

Mine used to grind sporadically on morning start ups before I had the timing TSB done. Now whenever the truck sits for more than 5 hours it grinds.