Serious knock?
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Mountain Pass
Joined: Apr 2011
Posts: 247
Likes: 18
From: Central Ohio
Serious knock?
I've noticed a bit of a knock the last few months on my '69 w/360. I've done plenty of accessory work over the years but don't have much experience with internal engine work. Am hoping someone here can clue me in on whether it's serious or not.
The original owner 'traded' it in to a dealer in PA in 2013. I have a mileage certificate from them and signed by the owner showing 103,000+ miles. I've also talked to the original owner and he says it has never been opened up.
I hope there's enough volume in the video......
https://www.youtube.com/watch?v=7pVn...ature=youtu.be
The original owner 'traded' it in to a dealer in PA in 2013. I have a mileage certificate from them and signed by the owner showing 103,000+ miles. I've also talked to the original owner and he says it has never been opened up.
I hope there's enough volume in the video......
https://www.youtube.com/watch?v=7pVn...ature=youtu.be
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Mountain Pass
Joined: Apr 2011
Posts: 247
Likes: 18
From: Central Ohio
Thanks for the suggestions. I pulled each plug wire but no change in the sound. Funny thing is that if I put my head over the top of the engine I don't really hear it. I only hear it if I'm standing in front of the motor. It seems most prevalent at the front-driver side.
I'll get it looked at but for now it's stuck in the garage until the threat of road salt is gone.
I'll get it looked at but for now it's stuck in the garage until the threat of road salt is gone.
Tuned
Joined: Aug 2019
Posts: 287
Likes: 71
From: SE Texas
How is the oil pressure? You should not have any bearing knock if the oil pressure is good.
It could be fuel pump or timing gear/chain noise. With over 100k on it, I would pull the timing cover and take a look. It could have the original plastic tooth cam gear that is starting to fail.
It could be fuel pump or timing gear/chain noise. With over 100k on it, I would pull the timing cover and take a look. It could have the original plastic tooth cam gear that is starting to fail.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Loosen the belts and run it with no acessories spinning. If it goes away itis something driven by belts. Get a 3 foot section of garden hose and put one end to your ear. Start probing acessories, :altrnator, power steering....
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
To me it sounds like it's at half speed. Meaning valve train noise. I would pull valve covers and see if there is any obvious problem with pushrods or rockers
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Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
I think 351 is right. I counted 24 knocks in 6.5 seconds. That comes up to 230 knocks per minute. Double that for crank speed and you get a 460 rpm idle. That is a decent slow idle for this engine.
So the thunks are at valve speed.
You saved a whole lot of money, OP. Do as 351 suggested and pull the valve covers. Look around, you will probably see the problem.
Good catch, 351.
So the thunks are at valve speed.
You saved a whole lot of money, OP. Do as 351 suggested and pull the valve covers. Look around, you will probably see the problem.
Good catch, 351.
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Mountain Pass
Joined: Apr 2011
Posts: 247
Likes: 18
From: Central Ohio
CougarJohn, good call w/ the garden hose idea. Though i used a small shop vac hose. It was definitely louder when I pressed the end of the hose to the fuel pump. I got nothing when pressing it against the valve cover or block. Hopefully that's a good sign and all I have is a noisy pump. It is most noticeable when cold. In fact last night I let it run for a good 20 mins or more and it was hardly there after. It does not increase in intensity with more rpm's and oil pressure is good I believe...if the gauge is to be trusted (oil still looks good and no real consumption since change 1000 miles ago). I did previously loosen the belts to check the ps pump & alternator. No problem there.
Though I will certainly pull the valve covers and inspect (need new gaskets anyway), I've got my fingers crossed that it's only the fuel pump.
Thanks to all for the suggestions.
Though I will certainly pull the valve covers and inspect (need new gaskets anyway), I've got my fingers crossed that it's only the fuel pump.
Thanks to all for the suggestions.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Change fuel filters and rubber lines when replacing pump.
It will run for a half minute with the pump off from bowl fuel. Maybe you could start it thus to see if the knock is gone.
Just a thought. See what the guys say.
It will run for a half minute with the pump off from bowl fuel. Maybe you could start it thus to see if the knock is gone.
Just a thought. See what the guys say.
Tuned
Joined: Jul 2019
Posts: 464
Likes: 80
From: Evansville, Indiana
I agree with CougarJohn, Replace the filter, hoses, et. and start fresh. If you have the $$, throw in a inline fuel pressure gauge. I'm doing the same to mine so in the future when you have issues you can trouble shoot much faster.
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