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EFV-8 Club Forum / General Mercury Discussion / 39 Mercury ticking noise only when accelerating

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39mercury
05-17-2021 @ 1:13 PM
Member
Posts: 46
Joined: Mar 2011
          
My 39 has recently developed a pronounced ticking noise when I accelerate. My first inclination is to focus on the exhaust manifold? I had duel exhaust installed and glass pack mufflers installed during the restoration. Recently I have been driving the car more often and have noticed the ticking sound only when I accelerate. No blue smoke or loss of acceleration just the annoyance of the tick tick tick tick when hit the go pedal. Thanks,
Steve Middleton

carcrazy
05-17-2021 @ 1:54 PM
Senior
Posts: 1585
Joined: Oct 2009
          
Do you have a full-time electric fuel pump installed? If so, when the demand for fuel increases, the fuel pump may be constantly working to it's capacity and staying on all the time.

39mercury
05-17-2021 @ 2:13 PM
Member
Posts: 46
Joined: Mar 2011
          
Still have the mechanical fuel pump only, and it is new.

Braig260k
05-17-2021 @ 8:41 PM
Member
Posts: 1
Joined: Apr 2020
          
Hate to say - but could be main rear journal . Had this myself . Check by removing back sparklead on both sides and when running give it a rev to see if there is no noise . If thats the case - well search deeper into motor .

TomO
05-18-2021 @ 7:48 AM
Senior
Posts: 7243
Joined: Oct 2009
          
Use a long screwdriver or a stethoscope to isolate the noise. If the noise only occurs under load, try using the next higher octane of fuel. If it has been a long time since your points were replaced, it may be a timing issue.

Tom

37RAGTOPMAN
05-18-2021 @ 8:59 AM
Senior
Posts: 1940
Joined: Oct 2009
          
39Mercury
I would try to block off the tailpipes and see if the tick gets louder
most likely it happened when you had the recent work done,
was it quiet before ?
exhaust tick most likely,
take it back to the man who did the work and see what he thinks,
maybe needs to check the exhaust bolts and nuts that they are tight,
before the exhaust gasket blows out,

, hope this helps 37Ragtopman

This message was edited by 37RAGTOPMAN on 5-18-21 @ 9:50 AM

trjford8
05-19-2021 @ 7:38 AM
Senior
Posts: 4202
Joined: Oct 2009
          
When installing the duals did you use the stock manifolds or headers? Did you make sure you had the correct size bolts in the front of the manifolds? Check all the welds on the pipes.

39mercury
05-19-2021 @ 2:52 PM
Member
Posts: 46
Joined: Mar 2011
          
Thanks to everyone providing feedback and good advice for where and how to narrow down and fix my Ticking noises. I did not change over to headers and used the stock manifolds and the muffler shop doing the welding. I will take some photos of the Engine Bay to share with the Forum in the next couple of days.

carcrazy
05-19-2021 @ 3:23 PM
Senior
Posts: 1585
Joined: Oct 2009
          
Did you do anything to increase the compression ratio like having the heads milled or installing aluminum high compression heads? If you did increase the compression, it may now be too high for the Octane of the fuel you are using. If you are currently using regular fuel and experiencing the ticking (or detonation), try going to premium fuel to see if it reduces or eliminates the noise.

39mercury
05-21-2021 @ 3:05 PM
Member
Posts: 46
Joined: Mar 2011
          
I took some images of my Rh and Lh exhaust manifolds specifically where the Muffler shop welded the pipes to the flange. I appears the Rh side shows some evidence of a small leak?


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