Please ID this sound (ticking/clicking)

[duke16]

Can anyone identify the ticking/clicking sound in the following wave file? The sound is most noticeable through the wheel wells, or under the truck. It's hard to pin point exactly where its comes from. My guesses are the camshaft, but it was doing it before and after the engine rebuild (although, it does seem a little louder after the rebuild). A leak in the headers, but I checked the TM headers and all the bolts are tight seem tight. And finally, a vacuum leak, but do vacuum leaks tick like that? Any other thoughts?

http://www.shooflyblues.com/upload/MIC-2008-07-23_07h34m11s.wav

Thanks

 

[Willard]

Sounds like something on the belt drive to me. Maybe a frayed belt hitting something?

 

[Turdle]

Not good-I do not like that sound.

It really sounds like mine when I burnt a piston and it was slapping the **** outta my block.

 

[tow0369]

When is the last time you checked the rod or a valve or rocker arm , I have had people with similar sounds say the timing chain as well

 

[duke16]

Sounds like something on the belt drive to me. Maybe a frayed belt hitting something?

Brand new belt. But I may try removing it on the weekend and seeing if that makes any difference.

Not good-I do not like that sound.

It really sounds like mine when I burnt a piston and it was slapping the **** outta my block.

...****...

When is the last time you checked the rod or a valve or rocker arm , I have had people with similar sounds say the timing chain as well

Engine was totally rebuilt, so 6,000 miles ago maybe. What I don't understand though, is that it's a very similar sound to the one the truck was making before the rebuild. I had always thought it was the TM headers, because the sound started around the same time I installed them. But perhaps this sound is not the same as before and then is something going on inside the engine.

 

[97ford50x]

sounds to me like a wrist pin slapping the cylinder wall had a mustang do it for over a year and then one day BOOOOM

 

[duke16]

One other thing I've noticed is that the sound is faster when you first start the engine, and then slows down a little after a few seconds.

 

[duke16]

I took it around to the machinist who rebuilt it and he said it sounded fine. He said it was just a rocker arm and that he does them a little looser then stock.

 

[Turdle]

I took it around to the machinist who rebuilt it and he said it sounded fine. He said it was just a rocker arm and that he does them a little looser then stock.

nope-
un uh

 

[moneyguy]

sounds like an exhaust leak at the header. or a lifter.

 

[patrick112390]

id guess a sticky lifter, slack in timing chain, or cracked header/exhaust leak, but if you just had her rebuilt, who knows :scratch:..but since you said it does it bad on start up, that points to valvetrain for me-low oil in valvetrain until pump starts circulating good.

 

[V8RangerBoy]

Not a vacuum leak. Vacuum leaks make funny idles, and don't make a clacking sound like that.

Probably not an exhaust leak either. Again, "gas" sounds, i.e., intake and exhaust noises, don't make the clacking sound that I'm hearing in the video.

Gonna say it's probably nothing to do with the belt either, simply because it wouldn't make the intermittent "clack, clack" sound. Usually it's a steady whirring or buzzing sound.

My first guess was a cylinder worn to the point that the skirt was slapping on the cylinder wall, but if it's freshly rebuilt, that's almost definitely not the case.

I'd look into a sticky lifter as well, as patrick mentioned. The 'louder on startup' typically points to an oil pressure problem. It's really common when we replace motors at the shop (usually with a rebuilt-reman. engine) to have a particularly loud lifter on the initial test drive, but usually the bubbles settle out after it sits for a while. Then on the second drive they'll be super-smooth.

 

[duke16]

I'd look into a sticky lifter as well, as patrick mentioned. The 'louder on startup' typically points to an oil pressure problem. It's really common when we replace motors at the shop (usually with a rebuilt-reman. engine) to have a particularly loud lifter on the initial test drive, but usually the bubbles settle out after it sits for a while. Then on the second drive they'll be super-smooth.

It's faster when I first start the engine, not louder. Which makes sense because the engine is reving a little higher at first.

If it's a sticky lifter, what can be done about that? Is it even a problem?