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Something doesnt sound good.. Need opinions.

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Old 06-22-2014, 08:38 PM   #1
boogerschnot
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Default Something doesnt sound good.. Need opinions.

So Ive been working on the wife's 67 Fastback today. The 289 has 68k miles on it and I removed all of the emissions stuff, replaced the "D" carb with a 4160 rebuilt by me. Today the carb was having some issues with the accelerator pump. Something is clogging the inlet to the pump so when I hit the accelerator pump arm all I hear is air.. no fuel.

Anyway. I was working on getting it sorted out and while running, all of a sudden, it sounds like there is a bolt or something bouncing around in a combustion chamber. I shut it down immediately and tried to figure out what the noise is..... I dont know. I checked the obvious, pump squirter screw and squirter jets, they are still there.

Here is my list so far, let me know what else I should check and what order..

1. pull the valve covers, check for a dropped valve
2. pull the intake and see if I can find something sitting in a inlet to the head
3. pull the heads and see what I might find.

I dont know what else could cause this sound. The motor kept running smooth so I guess its not a valve. Sounds like something randomly bouncing around inside the engine.

What do you think.
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Old 06-22-2014, 08:47 PM   #2
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do the easy stuff first. Like pull the plugs if you dont see anything from the valve cover side it be worth trying to track down a bore scope. but you could also just look for marks on the plug and things like that.
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Old 06-22-2014, 10:20 PM   #3
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.... and thats why they pay you the big bucks! thanks Gun. Ill give her a look tomorrow. It just sucks.
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Old 06-22-2014, 10:39 PM   #4
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last time i heard something like that i had an electrode shoved up inside of a spark plug. pull the head and found i was missing an exhaust valve. the stem was still in place. cracked the cylinder wall and ruined the new forged piston..
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Old 06-22-2014, 11:25 PM   #5
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Thats not fun. Lets hope its something stupid but not expensive..
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Old 06-23-2014, 08:26 AM   #6
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Are you sure it is not in the oil pan?
You can actually buy a bore scope from Harbor freight for about $90.
You say you removed the smog stuff from a '67 'Stang but I thought that smog equipment was not installed until '68 except for a pcv valve. Although the Gov made laws in early 60's, I believe the first emission test , except CA, were not required until '68. Our '67 in NJ does not need to meet an emission test. Being from CA, what did you remove?
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Old 06-23-2014, 10:30 AM   #7
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CA cars from 66-67 had air injection systems and hot air chokes on the air cleaners, in addition to PCV.
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Old 06-23-2014, 02:58 PM   #8
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I checked the plugs and everything was fine. Then I checked under the valve covers and though dirty nothing seemed out of place. I do need new valve stem seals and I found a few chunks in pieces under the covers. And a couple of what looked like seeds from animals living in the air cleaner a while back. I guess the intake needs to come off. Maybe I'll just wait and start on body work instead.. then I'll have a reason to get her running.
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Old 06-23-2014, 03:21 PM   #9
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Crank it over by hand does it feel smooth?

Try to use a flashlight and mirror to look into each combustion chamber.

do a compression test on each cylinder perhaps and listen for obstruction

perhaps its related to the carb issue...an accelerator pump that pumps air but not fuel when the floats are full is highly suspicious and may indicate a carb issue much greater than a bad accel pump and just maybe somehow it caused the engine to ping due to improper A/F ratio....

-Gun
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Old 06-23-2014, 03:47 PM   #10
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Think it would ping that harshly? That would make sense. The left bank isn't responding to the needle adjustment and maybe I have the timing so far off that it just might be a combination of the two. Hmm.. feeling hopeful again. I'll get a compression checker. But I'll screw with the carb and timing a little first. ..

Thanks gun
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Old 06-23-2014, 03:51 PM   #11
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Roll the engine over by hand first and make sure its smooth

Then roll it over with the starter and if it sounds smooth still maybe its something else

Set timing to 12 initial

Dump raw fuel down the carb and start it up it should run okay for at least a few seconds.
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Old 06-23-2014, 05:47 PM   #12
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Quote:
Originally Posted by boogerschnot View Post
Think it would ping that harshly? That would make sense. The left bank isn't responding to the needle adjustment and maybe I have the timing so far off that it just might be a combination of the two. Hmm.. feeling hopeful again. I'll get a compression checker. But I'll screw with the carb and timing a little first. ..

Thanks gun
HI;

IT IS NOT FROM DETONATION UNLESS YOU HAVE THE VACUUM Connected to manifold vacuum and it is pulling too much vac at idle.

your carb idle circuit is plugged on the one side remove thhe boost venturi and apray all the tiny holes using the long spray nozzle.

you can post a cell phone video of the sound loaded on youtube.com
.

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Old 06-23-2014, 08:09 PM   #13
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Well, the engine turns over smooth by hand, as expected at least. No noise by hand. I adjusted the main float a little and timing a tad lower and it fired right up, but is tapping hard somewhere at the rear passenger bank. Here is a video.

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Old 06-23-2014, 08:26 PM   #14
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hello;

you did not put it on you tube as i suggested so i can not see it to help you, sorry.
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Old 06-23-2014, 08:36 PM   #15
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Oh no.. not that.. Ill figure out how to get the video on.. Did you try clicking the image?

http://s974.photobucket.com/user/boo...ubau5.mp4.html
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67 Fastback A Code: 64k Miles, all original project for the wife.

http://www.cardomain.com/ride/2665602

Last edited by boogerschnot; 06-23-2014 at 08:40 PM.
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Old 06-23-2014, 08:52 PM   #16
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yes, my computer program or browser is not compatible with photobucket. i have old programs and need some plug ins or something for photobucket that i won't download.
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Old 06-23-2014, 09:57 PM   #17
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Its not ping that's for sure.

What RPM was that? idle?

Its hard to tell so much is lost between real life and a cell phone video.

You could try using a mechanics stethoscope.

Its possible that it could be a collapsed lifter if its sounds like its on top. To check for that use the stethoscope or remove the valve cover and roll the engine over by hand press on the top of each rocker arm directly above the push rod when the valve is fully closed with no load (lifter on base circle of cam) if the push rod feels spongy when pressed on it is likely that lifter is collapsed
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Old 06-23-2014, 10:36 PM   #18
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It does sound like it's on top. I'm also thinking lifter. I'll get in and check it tomorrow
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Old 06-23-2014, 10:44 PM   #19
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hello;

if there is a tivking from a lifter, try to adjust it. if it does NOT squirt oil out like an inch or more and dies not quiet down, it is not likely a lifter.

put a ruler across your rocker studs to see if one is high. if it is, your stud is pulling out.

if it is not, you might have a cam lobe gloing flat.

drain the oil and drag a magnet thru it. if it gets metal it is a bad sign.

does it have a big cam?

are your rocker studs screw in?

are your lifters made by comp cams?

exactly what oil are you using?

when did this start?

how many miles on eng?
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Old 06-23-2014, 11:17 PM   #20
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Barnett...What is the significance of comp cam brand lifters? I would like to know what you are thinking here

Thanks

-Gun
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Old 06-23-2014, 11:17 PM
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