Loud popping noise after warm up

[lat 64]

Dan,
This all kinda breaks my heart because I know the work you have into this.
I still hoping it's at the least in the top end(valve train), and can be fixed up relatively easy. It just clacks like that to me. Rod bearings coming apart have a more soulful deep and ominous knock that has a lower pitch. I hope for you I am right.
What a drag when all you want to do is go sailing.

IMHO not mixing up lifters is a general rule of good mechanics, but it's not going to make a bit of difference to a big noise like you have. I have rebuilt old-style ford v-8s(292 ci) with solid lifters that I reconditioned, mixed up, and even swapped in a few from other engines. They ran like a german sewing machines!
Your lifters very well might be sticking though and that would be a great, in a relative way of thinking.

Hoping for the best(least),

Russ

[ndutton]

My fingers are still crossed it's not a big end rod knock. Here's why - - Listening to the video the pop noise has an irregular frequency. It goes pop . . . . . pop-pop . . . . pop . . . . pop-pop-pop . . . pop . . . and so on. If it were a rod knock it would be consistent with a regular frequency at a given RPM like this: pop . . . pop . . . pop . . . pop . . . plus I would not expect it to be temperature sensitive. I agree with Russ too, I don't think the sound is deep pitched enough to be rod bearing related.

Anyway, it's still a guess. I'm hoping for the best too.

[Dromo]

I AGREE ,SOUNDS LIKE THE TOP END ,
I'S MORE OF A TICKING SOUND THEN A LOWER END KNOCK
I KNOW THIS IS REALY REACHING . WHAT ABOUT A FALTY PVC VALVE?
GOOD LUCK

[ndutton]

I KNOW THIS IS REALLY REACHING . WHAT ABOUT A FAULTY PCV VALVE?

Thanks Dromo. I saw it in the video but didn't want to be the one to mention it. Dan, worth a quick test with the PCV removed and the vacuum hose plugged??

Be still my heart.

[Dan.Sev]

Thanks Dromo. I saw it in the video but didn't want to be the one to mention it. Dan, worth a quick test with the PCV removed and the vacuum hose plugged??

Be still my heart.

Not a bad idea. Its a new PCV valve but ill try it.

[Dan.Sev]

Dan,
IMHO not mixing up lifters is a general rule of good mechanics, but it's not going to make a bit of difference to a big noise like you have. I have rebuilt old-style ford v-8s(292 ci) with solid lifters that I reconditioned, mixed up, and even swapped in a few from other engines. They ran like a german sewing machines!
Your lifters very well might be sticking though and that would be a great, in a relative way of thinking.

Hoping for the best(least),

Russ

Truthfully, I didn't at first, but when the machine shop took them and cleaned them up, they mixed them all up. When I said something to him about it he said it would be fine. I now am a little more informed lol.

[ndutton]

Dude, it's been a great week with the rollout of the EWDS but if this turns out to to be caused by the PCV I'm buying a lottery ticket.

[lat 64]

Truthfully, I didn't at first, but when the machine shop took them and cleaned them up, they mixed them all up. When I said something to him about it he said it would be fine. I now am a little more informed lol.

It's like everything, When you know a lot about something, You know what is relevant and what you can get away with. But when you are a beginner, you should always follow procedure.

The real issue is; What is really clacking away down there?

PCV: OMG! This will empty the barracks:

Aloha

[67c&ccorv]

FWIW I don't think it is a PVC valve - too loud IMO.

I am worried about the cylinder resleeving procedure - a very tricky job even for the best engine shops...especially from a shop that says mixing used valve lifters isn't a problem???

[ndutton]

FWIW I don't think it is a PVC valve - too loud IMO.

Agree. I never heard a PCV clack like that but let a guy dream for a while, will ya?

[67c&ccorv]

All I can say Neil...is I hope "Dan.Sev" isn't short form for this guy!

http://www.ufc.ca/fighter/Dan-Severn

[sail_flathead_lake]

I'm new to all this, but after reading these comments I went back and looked at the valves in post #33, and something looks wrong to me. The fifth lifter back in the first video (intake for #4?) - the nut appears to rotate as the engine is cranked. Have a close look at the adjusting nut - it looks like it's free to turn. Is this right? None of the others look like that.

[YOUTUBE]6d5ecsW_Z0Y[/YOUTUBE]

[Tar34]

Yes I think the tappets are free to rotate...

[Dan.Sev]

I am worried about the cylinder resleeving procedure - a very tricky job even for the best engine shops...especially from a shop that says mixing used valve lifters isn't a problem???

Come-on now, why do you have to say something evil like that.

[Dan.Sev]

All I can say Neil...is I hope "Dan.Sev" isn't short form for this guy!



http://www.ufc.ca/fighter/Dan-Severn

lol. Close but no.