HunterSmitty

I never indicated there was any widespread issue. In fact I said the exact opposite.

Truck owner

That was my point. You have no proof of it not being widespread..You can't base that on forum posts. Only FORD has the accurate data to the warranty/no warranty work being done on there trucks. I would assume the fact that Chris has stated there putting a beefier timing chain on compared to stock may say something about the issue..

johndeerefarmer

Ski

I change my ecoboost's oil at 5k mainly due to the gas that gets in it.
Thanks to your experience I will change my spark plugs more often and thanks to the OP for bringing the timing issue to our attention

johndeerefarmer

Yep, they get hot and they stretch just like the chains on my round baler and chain saw.

superih

After reading the "chain wear" article this is just more of a reason to change your oil. I can't believe people would run 10,000 miles per oil change, its only 6 quarts of oil in a turbo charged gas engine. The oil gets dirtier and more diluted than a NA motor. You should be changing oil every 3-4000 miles, spend $30 to avoid $13000 down the road.

But this is only my opinion!

Ssls6

If stretch is the problem, then I would guess hot restarts or quick engine spin-ups would the culprit...anything that adds inertial loads to valve sprint tension + friction.

I read that during the torture test tear down, the tensioner used up 30% of it's range (Ford was bragging on that). The problem with the torture test is the engine was held at constant rpm for 300 hours and did another ~5k miles dragging logs and towing trailers. The constant rpm test was to simulate 150k miles but it may not really simulate starting and stoping 20 times a day for a real 100k miles.

The next few years will be interesting for sure. I'm glad the OP contacted Ford so they can learn from the real world and adjust accordingly.

LastResort

Thanks for the info Chris74. I'm really curious to see how this goes. Does anyone have access to a system that could identify when part numbers changed? I'd like to know if I have an upgraded timing chain, or I need to reduce my oil change interval. Even though I think these vehicles probably represent a corner case for use, if reducing my change interval by 20% saves me 10% chance of needing a long block, I'll do it.

Smokin Joe

The work order below says it was the secondary chain that broke. That chain only runs between the camshafts on that cylinder bank. The primary chain is powered by the crankshaft and spins one cam per bank. There is another chain that spins the second cam. That's what it says broke.

If you really want to see long cam chains look at the Audi 4.2L V8.

Howler

The picture and this statement dont seem to add up...

Truckit

The secondary chains are behind the sprockets and not visible. The only part number I have seen gives you a set of three chains, one long primary and two short secondary. Edit, looks like the chains are available separately. 6268 for the long chain, 6268B for the short. http://www.fordparts.com/Commerce/Ca...o=F-150#Search Part numbers given are same 2011-13 but doesn't mean they weren't changed.