Audio Diagnostics |
Post Reply | Page 12> |
Author | |
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
Posted: 02 June 2018 at 7:47pm |
OK Gang. Changed out the Intake and exhaust manifolds as well as checked valve springs and set all the valve spring clearances, but..... still have this clack clack clack noise coming from the engine. Vacuum testing shows gauge bouncing between 20-22 rapidly. A relatively new occurrence. Any ideas?
THIS is how it USED to sound: https://vimeo.com/239275820 THIS is how it sounds now https://vimeo.com/273119710 Edited by cal.bar - 02 June 2018 at 7:55pm |
|
otto
Member Joined: 26 Feb. 2012 Location: Orygun Status: Offline Points: 2267 |
Post Options
Thanks(0)
|
Do you have a mechanic’s stethoscope? It might help you locate where the noise is coming from.
|
|
47 CJ2A w/fuel injected boat engine
48 CJ2A 64 Ford Econoline Travelwagon If you can't get there in a Jeep, get a motorcycle! |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
I don't but the noise seems to be coming from right in the middle of the engine block (or so it seems) |
|
cpt logger
Member Joined: 23 Sep. 2012 Location: Western Colorad Status: Offline Points: 3043 |
Post Options
Thanks(0)
|
Hell, you do not need a "Mechanics Stethoscope", you just need an old broom stick. Cut off the handle at whatever length is good for you. I like about 3.5 feet long. Place the cut off end against the engine block, (or whatever you want to listen to), & the rounded end in your ear. It is amazing how well this works. I have used long, wood handled, screwdrivers as well. Just for grins, remove the fan belt & see if the noise goes away. If it does, it is either your water pump, or your generator/alternator with a bad bearing/bushing. This a cheap & easy test. Just do not run the engine for a long time this way. Another thing to look at are your engine mounts. If they are bad, they can let the engine transmit it's vibration to the tub +/or frame. Actually, if any part of the engine, gear boxes, or exhaust pipe, is touching any part of the tub +/or frame it will also transmit that vibration. The tub/frame will act as a sounding board, kind of like a drum. IHTH, Cpt Logger.
|
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
Thanks Capt. Great ideas! Sadly (or not) I removed the fan belt and ran it and there was no change in the sound of the engine. All motor mounts look fine. The eng. is not shaking or rattling, but it just makes that clak clak clak noise. I doubt that I suddenly lost compression in one or more cylinders so as to suspect that. Still wondering if the new exhaust manifold and/or intake manifold could be the issue since they are the only thing to change before the new clacking sound.
Edited by cal.bar - 03 June 2018 at 3:43am |
|
athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4151 |
Post Options
Thanks(0)
|
Sounds similar to an issue I had a few years back...
You won't believe what my issue ended up being.
|
|
1- 1946 CJ2A
2- 1949 CJ3A |
|
rocnroll
Member Sponsor Member Joined: 20 July 2005 Location: Tuscumbia, AL Status: Offline Points: 13609 |
Post Options
Thanks(0)
|
And the diagnosis was.......(suspense continues) |
|
'47 CJ2A PU
'48 CJ2A Lefty "Common sense is not that common" |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
TIM YOU'RE KILLING ME. Yes, it sounds very similar to my problem. I was settling down to the idea that it had something to do with my intake or exhaust manifolds since they are the only thing that changed immediately prior to my sound appearing and with the engine running well otherwise, I figure it has to be an exhaust kind of thing.
|
|
athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4151 |
Post Options
Thanks(0)
|
Sorry. Sometimes I like to build up the suspense.
My issue was so unusual, and is not likely the same as cal.bars, but is an easy diagnostic. |
|
1- 1946 CJ2A
2- 1949 CJ3A |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
WOW! That DOES sound VERY similar to mine. I did have to remove the carb each time I went to replace the exhaust and intake manifold, but don't remember any lost screws etc. But who knows. Although NOT exactly an EASY diagnostic. Pulling the head risks a broken head stud or two, and replacing the head gasket at a minimum. Not to mention, since I've never done it before, there is the "moron" factor of me screwing something up in the process.
But at this point, I am at a loss for anything better in terms of a diagnosis. |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
So... setting aside the screw for a moment, could it be a piece of carbon (from the removed manifolds for example)? Would running some seafoam or other additive make any sense before pulling the head gasket?
Also, saw a guy on YouTube use a micro camera to go down the park plug hole to view the top of each piston. I suppose I would be able to do that first w/o having to pull the head! That would (in theory) show me the top of the piston where Tim's screw came to rest. Although not sure what to do if the problem were below the piston. Edited by cal.bar - 03 June 2018 at 6:07pm |
|
athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4151 |
Post Options
Thanks(0)
|
cal.bar...The simple part is to look down the throat of the Carter and make sure both screws are still holding the throttle plate to the throttle shaft.
A more involved diagnostic is pulling the head to see if a chunk of carbon or a chunk of piston has broken free. But I wouldn't do this until you determine if the knock sounds like it's at the top of the engine. Edited by athawk11 - 03 June 2018 at 6:04pm |
|
1- 1946 CJ2A
2- 1949 CJ3A |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
If you mean the choke plate right up near the top of the carb, yes, I have both of those in place. I only removed the two big bolts at the bottom of the carb to take the entire unit off, I didn't fiddle with anything inside. But, perhaps a piece of a ring or carbon have gotten in there? |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
OK, you HAVE to love technology. I just ordered an ultra small lighted endoscope for my cell phone. (all of $25.00) When I get it, I will run it down the spark plug hole. That should allow me to view the top of each piston the way Tim showed us in his pics. I will get pics and report back. If I
find a screw like Tim did, I owe him a nice bottle of scotch. If not.... well, he can come up with another idea for the noise. |
|
48walker
Member Joined: 17 Mar. 2017 Location: Wisconsin Status: Offline Points: 366 |
Post Options
Thanks(0)
|
Don't laugh-is your dipstick bent? Unscrew it, turn it 180 degrees and screw it back in.
|
|
athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4151 |
Post Options
Thanks(0)
|
That sounds like a great tool. Easier than pulling a head.
The screw I lost was on the lower "throttle" plate located inside the base of the carburetor. The screw head faces down, but you may still be able to see the back side of the screw if you shine a light down there. Again, it's more likely some type of valve leak or manifold leak, but it sounded very similar to my past issue, so I thought I would share it as a possibility...no matter how remote.
|
|
1- 1946 CJ2A
2- 1949 CJ3A |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
I will use the new camera to take a peek at the top of the Pistons. But I can't help but think it has something to do with a manifold leak. I replaced the manifold gasket when I replace the exhaust manifold, however I am wondering if any of you have had experience with a manifold ceiling gasket maker kind of like Permatex that is impervious to the Heat for a little more reassurance in terms of seal
Edited by cal.bar - 04 June 2018 at 2:35am |
|
cal.bar
Member Joined: 10 Sep. 2016 Location: So. Cal. Status: Offline Points: 768 |
Post Options
Thanks(0)
|
Nope, good and straight. But interesting thought though |
|
Post Reply | Page 12> |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |