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Hello!

 

So I have recently discovered an issue with my 401. I have an intermittent ticking sound coming out of the right side exhaust pipe. I originally thought it was the resonator as it appeared to be coming from that end of the exhaust, however when i straight piped the car, the noise was still there. Its a ticking sound that gets faster with the engine speed, and seems more "throaty" at idle. Now, this does not happen all the time, and it doesn't matter if its warm or cold outside. And again, its only on the right side so I feel like it might be a sticking lifter maybe? So before i pull the covers off and start trying to diagnose a problem I can't duplicate (it never happens when i need it to) I would like to know if anyone else has had this problem, and what they found.

 

Thanks for your help!

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Sounds like you're describing the 'Riviera rattle' which is the fuel return line vibrating against the frame.  A couple of well placed pieces of rubber insulation will cure it (or at least you won't be able to hear it.)  

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  Sometimes a "ticking" noise can be a small exhaust leak. There are plenty of potential souces for exhaust to leak in the area of the right hand exhaust manifold but if it is an exhaust leak I would guess an individual cylinder at the cylinder head to exhaust manifold junction. When the tick presents itself, pull each of the spark plug wires on that bank one at a time, shorting each cylinder one at a time, and listen to see if you can stop the noise by shorting a particular cylinder. If so, you have an exhaust leak at that cylinder. Sometimes the exhaust manifold bolts can become just loose enough to cause a very small exhaust leak and tightening them can help. Good luck,

Tom Mooney

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2 hours ago, unconventional63 said:

Hello!

 

So I have recently discovered an issue with my 401. I have an intermittent ticking sound coming out of the right side exhaust pipe. I originally thought it was the resonator as it appeared to be coming from that end of the exhaust, however when i straight piped the car, the noise was still there. Its a ticking sound that gets faster with the engine speed, and seems more "throaty" at idle. Now, this does not happen all the time, and it doesn't matter if its warm or cold outside. And again, its only on the right side so I feel like it might be a sticking lifter maybe? So before i pull the covers off and start trying to diagnose a problem I can't duplicate (it never happens when i need it to) I would like to know if anyone else has had this problem, and what they found.

 

Thanks for your help!

 

Just to expand on what Tom was talking about. I had this happen twice on my 63. Two years ago I had this very same thing and found it was exhaust leaking from the heat riser where the flap attaches in the manifold. They removed the flap and welded the holes shut from the outside. Problem solved. 

 

Last summer the problem returned. Same side and the same noise. This time It was a cracked manifold. The noise would lessen as the car/manifold warmed up causing the gaps to narrow and close. Eventually it grew worse to the point I had to replace the manifold. I have attached some pictures. There were actually 2 cracks. New manifold, no noise.

 

Bill 

 

 

Riviera old manifold 1.jpg

Riviera old manifold 2.jpg

Edited by Riviera63
revise text (see edit history)
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Here are a couple  of more pictures. One shows the heat riser flap hole welded shut.

 

Bill

 

 

IMG_4404.JPG

IMG_4405.JPG

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On ‎1‎/‎30‎/‎2019 at 8:56 AM, RivNut said:

Sounds like you're describing the 'Riviera rattle' which is the fuel return line vibrating against the frame.  A couple of well placed pieces of rubber insulation will cure it (or at least you won't be able to hear it.)  

 

AH thank you I will have a look and see if that is the case here!

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On ‎1‎/‎30‎/‎2019 at 9:38 AM, 1965rivgs said:

  Sometimes a "ticking" noise can be a small exhaust leak. There are plenty of potential souces for exhaust to leak in the area of the right hand exhaust manifold but if it is an exhaust leak I would guess an individual cylinder at the cylinder head to exhaust manifold junction. When the tick presents itself, pull each of the spark plug wires on that bank one at a time, shorting each cylinder one at a time, and listen to see if you can stop the noise by shorting a particular cylinder. If so, you have an exhaust leak at that cylinder. Sometimes the exhaust manifold bolts can become just loose enough to cause a very small exhaust leak and tightening them can help. Good luck,

Tom Mooney

 

Hmm that makes sense. I will pull the wires this weekend and see if i can isolate it. The problem I've ben having though, is it doesn't make the noise when i need it to lol so hopefully i can get it to duplicate, and then i can try this trick!

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23 hours ago, Riviera63 said:

Here are a couple  of more pictures. One shows the heat riser flap hole welded shut.

 

Bill

 

 

 

 

This also makes sense...ok i will have a look at the heat riser valve, and then pull the manifolds. I always worry about doing that in fear of braking off bolts. Do you have a suggestion for preventing that? Should i soak the manifold bolts in WD 40 or something similar prior to trying those bolts? Or are they usually good to get out? MY car is pretty clean so i dont think they would be rusted.

Edited by unconventional63 (see edit history)

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IMHO, check the rattle before you start futzing around with removing exhaust parts.  Hint: it's easier with an empty gas tank. ;) 

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1 hour ago, unconventional63 said:

 

Hmm that makes sense. I will pull the wires this weekend and see if i can isolate it. The problem I've ben having though, is it doesn't make the noise when i need it to lol so hopefully i can get it to duplicate, and then i can try this trick!

Do the troubleshooting before you condemn the manifolds for an exhaust leak. The Riviera rattle that is mentioned sounds deeper than a "tick". Most folks describe the rattle as a "knock" , which has been my experience.

Tom

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3 hours ago, KongaMan said:

IMHO, check the rattle before you start futzing around with removing exhaust parts.  Hint: it's easier with an empty gas tank. ;) 

 

absolutely.  wouldn't start ripping things apart too far without doing the easy stuff first...when i was going through my apprenticeship, i remember i was diagnosing a horn not working...1 hour into tracing wires, i checked the fuse. It was blown. lol.

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2 hours ago, 1965rivgs said:

Do the troubleshooting before you condemn the manifolds for an exhaust leak. The Riviera rattle that is mentioned sounds deeper than a "tick". Most folks describe the rattle as a "knock" , which has been my experience.

Tom

 

Hmmm well i think it borderlines on a knock.....but at least this thread is giving me some guidance and a few things to check. I remember the noise appearing to be further back closer to the rear tire, so that's why i initially didn't think it was an exhaust leak and more the resonator. But again, now that its straight piped it still there. Thanks again

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Not to add to your list of potential culprits, but I had a mystery ticking noise a few years back. I was sure it was either a bum lifter or cracked manifold but it turned out to be a loose harmonic balancer bolt. I was completely frustrated, unable to locate the noise and very reluctant to tear off either a valve cover or a manifold. One day, the ticking started to sound more like a slight chirping. Under a load, it sounded like a knock. I got down under the front of the motor while it was running and it was audible. You could even see a slight wobble in the harmonic balancer. Spooky, but I caught it in time before it damaged the crank. I was so busy looking for the culprit at the top of the motor I never thought to get down under it and listen. Worth a look...PRL
 

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24 minutes ago, unconventional63 said:

 

Hmmm well i think it borderlines on a knock.....but at least this thread is giving me some guidance and a few things to check. I remember the noise appearing to be further back closer to the rear tire, so that's why i initially didn't think it was an exhaust leak and more the resonator. But again, now that its straight piped it still there. Thanks again

Well, that sounds like it could be the fuel line rattle...typically sounds like it`s coming from the right side toward the rear. IIRC, the sound is more pronounced when the engine is cold.

Tom

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Just a quick word, but the “Riviera Rattle” affects only air conditioned cars. Cars without air do not have the return line. It was never said if the car in question is equipped with air.

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17 hours ago, petelempert said:

Not to add to your list of potential culprits, but I had a mystery ticking noise a few years back. I was sure it was either a bum lifter or cracked manifold but it turned out to be a loose harmonic balancer bolt. I was completely frustrated, unable to locate the noise and very reluctant to tear off either a valve cover or a manifold. One day, the ticking started to sound more like a slight chirping. Under a load, it sounded like a knock. I got down under the front of the motor while it was running and it was audible. You could even see a slight wobble in the harmonic balancer. Spooky, but I caught it in time before it damaged the crank. I was so busy looking for the culprit at the top of the motor I never thought to get down under it and listen. Worth a look...PRL
 

 

Ohhh yea that is definitely worth a look. Thank you!

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16 hours ago, steelman said:

Just a quick word, but the “Riviera Rattle” affects only air conditioned cars. Cars without air do not have the return line. It was never said if the car in question is equipped with air.

 

AHHH good to know! Mine is air conditioned so I'm good there. Thank you for the tip!

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