I went against the advice of my brother and replaced both heads on my flex 5.4 3v. I primed and started the truck no problems. But once I started out my driveway it started to make a grinding noise. So I parked and pulled the front cover. I didn't see any obvious issues there.
.do you think I've possibly spun a bearing or something. The motor isn't knocking as much as it is grinding. I originally suspected that the chains were rubbing the timing sprocket but after inspection I found no damage. Any ideas? 2007 5.4 3v flex XLT 4x4 240,000

 

Could it be the starter?
What year?

 

Its not the starter, I've checked that as well. Doesnt grind when turning over, it only starts once engine is running. Truck is an 07

 

Could be the flex plate everyone talks about?
I never fooled with a flex plate yet.
It would make a grinding sound.
Could you record the sound? Might help.

 

Welcome!
.
Vehicle Information

If you're not going to provide the vehicle information in your post(s), consider putting your complete vehicle information (year, model, cab, trim, engine, wheelbase, _x4 drive, mileage, maintenance, modifications, etc., etc.) in your signature to have it automagically included when you post. *Eliminates playing 20 questions when/if a post is made in the future pertaining to your vehicle.
» Edit Signature ««« -click-
*Don't forget to [ save ] it.
.
Also... There are year specific forums which better serve non-general F-150 issues/topics..

 

Is the grinding noise only when the truck is in motion? Does the grinding occur with the truck running in Park?

 

cant hear any noise when rotating manually or when starting, but once running motor has a grinding gear sound. one might think the flex plate or the timing sprocket. apon inspection i see no damage to teeth.

 

this is my first thread, but i have seen where in the past mods have been able to move the thread to a more apporitye location. are you, me or can someone move it for me or shoulkd i start a new one in the late model ford forums?

 

Message https://www.f150forum.com/members/djfllmn-108147/

Tell him where you want it, he can change it over.

 

You said 2007 I guess here would be best?
https://www.f150forum.com/f4/