The chirp is back....

[Eddo Rogue]

I think my cam synchro is chirping again. I've already replaced it twice. The current one is a NOS discontinued Motorcraft unit I snagged off ebay.

I am hoping its just a pulley, but it is intermittent, so I dont think running it without the belt will help diagnose.

could it be just a pulley? An Idler, or my crappy ac compressor perhaps?

Why would my cam synchro keep going bad? The first one I get because it was Dorman unit. But I thought the Motorcraft would last.
Yes Virginia, I soaked the gear in oil before assembly.

 

[Dirtman]

So yea, this is a thing...

 

[DILLARD000]

Try squirting penetrating oil on one pulley bearing at a time then drive for a day; again one at a time; if chirp goes away thats the one. What belt does it have on it?

 

[sgtsandman]

You can run the engine for a little while when it’s cold without a belt and not have a problem. Unless you have to have the engine warm for it to happen.

Just don’t do it for more than a few minutes. Once the coolant in the block starts getting hot, it’s time to shut it down before you over heat it.

 

[Eddo Rogue]

Yep it only does it when it's warm...usually after a hard drive like a freeway run when traffic flow is 80mph

 

[sgtsandman]

Well that kills that idea...