Help fix my tick?

[myasylum]

This is my freshly built 408. The thing is after 70 miles it has developed a tick already. Could someone help diagnose what it might be?
I already re torqued the rockers and the exhaust manifold.

The best I could do was post a clip for you guys and hope you can hear it??
What doesn't help is that the exhaust is pretty loud. I know the video is bad, but if you could just try to listen??? It seems to be coming from the last cylinder on the passenger side. It is also stumbling a bit. I guess that could be anything though.

Whats REALLY weird is this tick sound is just like the one on my slant 6!
Does this sound serious?

Thanks!

http://www.youtube.com/watch?v=c4Z1mgr1oiY

 

[ramcharger]

Sounds like a cam lobe got wiped or an exhaust leak at the header. Hard to say without being there.

 

[myasylum]

What do you mean by "cam lobe got wiped". The cam is shot?
Can it be run this way for a long period of time, or should it be replaced?

It seems to have plenty of power, I hope I can fix that stumble.

as I say, I retightend the exhaust manifold. I wish it was the simple.

 

[dodgetkboy78]

Sounds bad on the video......

cam lobe? Do you have adj rockers?

Reason the vid is a bad idea, is because it sounds like a detroyed piston to me..............

 

[myasylum]

no adj rockers.

I'd think if the piston was bad there would be no power, or low power from lack of compression.

 

[green1]

Pull the cover, check those 2 rockers.

 

[myasylum]

well, I did pull the cover and tightened them. What exactly would I be looking for?

 

[green1]

See if they have the same lift as the others, to check the lobe.

 

[myasylum]

??

 

[myasylum]

Also, can I drive the car this way? Or is this something that needs to be replaced immediately? (assuming that's what it is?)

 

[myasylum]

The lift was the same for all of them. From what I measured from the head to the rocker open was 1 3/4". I checked the push rods, they seem fine too.
It's running awful now. I think I may have the timing all out of whack though from screwing around.

If it's not the cam lobe, any other ideas?

 

[pettybludart]

Sounds like an exhaust leak in the vid,it,s hard to tell not being hands-on.The stumble,check for spark jumping from#5 and 7 plug wires.These small blocks are notorious for this problem,so just double check.I wouldn,t drive it til you get these issues figured out.Don,t want to screw up your new motor.Good Luck.:read2:

 

[ramcharger]

What do you mean by "cam lobe got wiped".

You may have lost a cam lobe due to improper lubrication.

The cam is shot?

If it lost a lobe it is shot, kaput, no good

Can it be run this way for a long period of time, or should it be replaced?

Absolutely not. All that metal could be circulating around your engine.

It seems to have plenty of power, I hope I can fix that stumble.

7 eighths of 450 hp is still a lot of grunt.

as I say, I retightend the exhaust manifold. I wish it was the simple.

I hope that the cam is not the problem. If it is, at minimum your looking at basically tearing the engine apart and replacing the oil pump, cam, lifters and maybe pushrods and clean out all oil passages. Bearings should all be inspected too.

Pull your valve cover and rotate the engine to TDC on the compression stroke for every piston on that bank. Check your rocker arms on each cylinder @ TDC on the compression stroke for play. There should be none if it's a hydraulic cam. If you do find play pull your intake manifold and check those lobes. It'll be pretty obvious.

 

[myasylum]

Well, since it has now gotten cold, and snowing a bit, I haven't had a chance to mess with the car much. Today though I went out there, and all I did was mess with the timing. I timed it to 35 degrees. It seems to be happy there. The stumbling has stopped all though there is a slight miss, which could be the wires. Also the tick became lot quieter, although it is still slightly there. So, I still don't know what exactly it is, just just messing with the timing alone has seemed to make quite a difference.
I just don't know how much a slight tick is worth worrying about since my slant 6 had a tick for a long time and it still ran fine? I'll have to take it in to a shop this Spring. It just makes me slightly more happy that I did get it running better before the Winter officially begins!

 

[fishy68]

Run it if you feel real lucky. I say that because if there is something mechanically wrong (and something ain't right or it wouldn't be noisy) it could easily come unglued and totally destroy everything including the block. I can't tell much from the video. I hear something that don't sound good but there's too much background noise for me to tell.

 

[myasylum]

Yea, I know. It's a bad video. Maybe I shouldn't have posted it until I could get something better. I was a bit anxious and freaked out. I think I will try again tomorrow.
I did get it to sound better than it does in that clip though.
A lot of people said that timing alone wouldn't make that tick. It may be coincidence I admit, but after I timed it to 35 degrees it does sound a whole lot better.

 

[fishy68]

Have you double checked to make sure everything is tight? If something mechanical is loose it could be banging against something else. I had a problem with my Cuda when I first put it together where one of the header tubes on the pass side was rattling against the engine to trans. bracket. It sounded awful. And it made a diff. in the sound when I changed the timing. I believe that was because the exhaust note resonating through changed in pitch with different timing. At least that's the best explanation I can come up with. I took the engine to trans. bracket off and ground about 1/8" off where it was hitting the header tube and the noise left.

 

[Longgone]

If it`s a hydraulic cam/lifter set it may be a lifter that isn`t pumping up. I had that issue with new lifters from Mopar Performance. I simply replaced the one bad lifter. Put a stick to the valve cover and see if you can hear which cylinder it seems to be coming from. Another thing you can do to help isolate the subject cylinder is to pull the plug wire and see if the tick/knock minimizes at all.

 

[myasylum]

I have the Voodoo lifers that came with the cam (it is hydraulic cam/lifter by the way). Do you think i can buy just one or two, or do you think I'd have to buy a whole set?

Dumb question, I know... but If I pull the wire everything is still in motion, so wouldn't the sound be there if I pulled the wire or not?

I am thinking it's a lifter thing too... but I know nothing. Just a guess.

Is there a way to see if a lifter is bad by looking at it? Or is it just a matter of replacing it and seeing what happens?

 

[Longgone]

The noise won`t go away by pulling the plug wire because as you say everything is still rotating but the sound can be minimized because there`s no explosion going on in that cylinder. I located my bad lifter by liistening with a stick and simply replaced by using a strong magnet and pulling it through the head. I tried taking it apart and cleaning it first but to no avail so I just bought a new one. With adjustable rockers a bad lifter may show up as one that`s hard to adjust because it`s not pumping up with oil and giving resistance to the adjuster.