Tick Tick Tick ...
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Cross-Country
Joined: Apr 2022
Posts: 95
Likes: 28
From: Southern California
Tick Tick Tick ...
Happy Sunday!
The below attached video was taken on a warm engine, shot right below the harmonic balancer. The belt was disconnected for this video, so it's not any of the accessories or the fan causing the noise.
You should be able to hear a pretty clear intermittent metallic tick in the first half of the video. It speeds up with engine speed.
It's especially clear between the 5-7 and 17-23 second mark in the video, and completely disappears after 35 seconds.
What are your guesses?
Thanks in advance,
André
The below attached video was taken on a warm engine, shot right below the harmonic balancer. The belt was disconnected for this video, so it's not any of the accessories or the fan causing the noise.
You should be able to hear a pretty clear intermittent metallic tick in the first half of the video. It speeds up with engine speed.
It's especially clear between the 5-7 and 17-23 second mark in the video, and completely disappears after 35 seconds.
What are your guesses?
Thanks in advance,
André
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Cross-Country
Joined: Apr 2022
Posts: 95
Likes: 28
From: Southern California
Thank you for your reply.
I believe the timing to be set correctly at 10 degrees BTDC. I had a timing light on it recently and it was set right. Considering timing is set right, is there a good way I could rule out pinging? Retard timing and see if it persists?
It's hard for me to say where the noise comes from since it is so intermittent. I took this video to check something else and just so happened to capture that sound. It happens very randomly.
One theory I had was an exhaust leak.
I believe the timing to be set correctly at 10 degrees BTDC. I had a timing light on it recently and it was set right. Considering timing is set right, is there a good way I could rule out pinging? Retard timing and see if it persists?
It's hard for me to say where the noise comes from since it is so intermittent. I took this video to check something else and just so happened to capture that sound. It happens very randomly.
One theory I had was an exhaust leak.
Laughing Gas
Joined: Jan 2023
Posts: 1,172
Likes: 114
Possibly. Mine ticks from an exhaust leak, a way I learned from a Chris fix video to check an exhaust leak is put a sho vac in the exhaust, and reverse the direction. And then you can spray soapy water on it and see if it bubbles anywhere I’d assume you have to tape it at the end where you put the shop vac in.
Hotshot
Joined: Jun 2015
Posts: 12,768
Likes: 2,420
That is a good possibility with enough slack in the chain.
Laughing Gas
Joined: Jan 2023
Posts: 1,172
Likes: 114
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Laughing Gas
Joined: Jan 2023
Posts: 1,172
Likes: 114
I’m not sure if it’ll work, but to rule out timing chain use a stethoscope and put it on the timing cover in a few spots and listen for that tick. If it’s not there maybe move onto other places like valve covers, oil pan, and see where the noise is from. Someone here with more experience will have to verify if you can do that, I’ve only used a stethoscope 2 times so I don’t know if it’ll work like that. Shouldn’t be to hard to do since you have all of the pulleys disconnected from the crank.
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Cross-Country
Joined: Apr 2022
Posts: 95
Likes: 28
From: Southern California
Thanks for the input to everyone.
It'll be a while before I can get to my truck to test more stuff and I will update you then. The problem with this is that the noise very rarely ever happens. When it does happen again I'll get a video from the top.
I just don't know how to explain the intermittent nature of the sound with some of the suggested issues (rocker arm, timing chain).
Admittedly I shouldn't have revved it this hard. The noise rarely ever happens and I was getting desparate to know what it was, hence the revving. If it would have broke something completely, at least I would have known what it was then.
Thanks again
It'll be a while before I can get to my truck to test more stuff and I will update you then. The problem with this is that the noise very rarely ever happens. When it does happen again I'll get a video from the top.
I just don't know how to explain the intermittent nature of the sound with some of the suggested issues (rocker arm, timing chain).
Admittedly I shouldn't have revved it this hard. The noise rarely ever happens and I was getting desparate to know what it was, hence the revving. If it would have broke something completely, at least I would have known what it was then.
Thanks again
Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
I am having the exact same problem with my 351 right now, I just replaced my harmonic balancer today with no avail. My noise used to be rare and then it started getting progressively worse until this week its all you can hear on startup but it does go away, if I find anything I will let you know, I believe harbor freight has a stethoscope for 6$, I picked one up to help me diagnose the same sound.
Tuned
Joined: Dec 2005
Posts: 398
Likes: 56
From: Saskatchewan
Impossible to tell from a video. That sound could be from many sources. A stethoscope can help determine if it is internal to the engine. I would also look around for heat shields and hardlines that are moving with engine vibration and making intermittent contact.
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