Engine noise-ticking - NCRS Discussion Boards

Engine noise-ticking

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  • Bob H.
    Very Frequent User
    • July 31, 2000
    • 800

    Engine noise-ticking

    I have a problem with my new acquisition, an original 72 350/200 with 80k.

    At idle there is absolutely no noise but when driving I could hear a ticking that sounded somewhere between a lifter and an exhaust leak.
    Started it awhile ago and as usual it was quiet even when reving up at holding at steady speed. However, after I ran it for awhile, I started to hear it but it is coming from the front of the engine. It has an original fan clutch which is tight and the water pump is tight as well. Then I got to thinking, could it be the timing chain. When reving, a couple of taps seemed louder then the regular ticking and it only occurs when you get up to say 2000 rpms.

    Could it be slop in the chain when hot causing it to hit the cover? I couldn't get on the cover with my stethoscope
  • Bob H.
    Very Frequent User
    • July 31, 2000
    • 800

    #2
    Re: Engine noise-ticking

    any ideas?

    Comment

    • Frank D.
      Expired
      • December 27, 2007
      • 2703

      #3
      Re: Engine noise-ticking

      I'll loosen/remove fan belts and VERY BRIEFLY run an engine to try to diagnose a sound...a mechanic's stethoscope sometimes help or a short piece of rubber hose held to the ear...

      Comment

      • Carl N.
        Expired
        • April 30, 1984
        • 592

        #4
        Re: Engine noise-ticking

        I would pull fan belt, p/s belt, compressor belt and see if noise goes away. Check torque on all exhaust manifold bolts, check exhaust manifold to pipe flange bolts/leaks. Check operation of heat riser valve on passenger exhaust manifold. How many miles on motor, if over 100k then it may be done. These can be hard to find as the noise will travel. Good luck.

        Comment

        • Harry S.
          Extremely Frequent Poster
          • July 31, 2002
          • 5277

          #5
          Re: Engine noise-ticking

          Bob, I had a similar problem on a 63 but I had it at idle as well. It took me about 3 weeks to find the problem. I swore it was a lifter on number 1 cylinder. It turned out to be the bearing in the P/S pump.

          As a test, remove the P/S belt and see if the pulley wobbles. Take it for a test drive with no belt.


          Comment

          • Carl N.
            Expired
            • April 30, 1984
            • 592

            #6
            Re: Engine noise-ticking

            Sorry you stated 80k, but that is close.

            Comment

            • Bob H.
              Very Frequent User
              • July 31, 2000
              • 800

              #7
              Re: Engine noise-ticking

              That's exactly what I thought, a number 1 lifter. I did not eliminate the p/s pump but will try it. it sat 13 years

              Comment

              • Duke W.
                Beyond Control Poster
                • January 1, 1993
                • 15635

                #8
                Re: Engine noise-ticking

                I believe a '72 would have the nylon tooth cam sprocket, but with only 80K miles it's probably never been changed, but could be loosing teeth. It may not be the problem, but you should put it on your "to do" list. Replace it with the NAPA OE replacement truck chain (made by Cloyes) or equivalent... costs about 25 bucks for the set and should last longer than most of us.

                BTW, nice find!

                Duke

                Comment

                • Bob H.
                  Very Frequent User
                  • July 31, 2000
                  • 800

                  #9
                  Re: Engine noise-ticking

                  Will do that change out as well. thanks

                  Comment

                  • Mark E.
                    Extremely Frequent Poster
                    • April 1, 1993
                    • 4503

                    #10
                    Re: Engine noise-ticking

                    Great suggestions.

                    I've heard exhaust leaks which closely mimic the sound of a noisy valve.

                    Pre-ignition can also sound like valve train noise. Just temporarily retard the ignition and see if that makes a difference.
                    Mark Edmondson
                    Dallas, Texas
                    Texas Chapter

                    1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                    1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                    Comment

                    • Mark L.
                      Very Frequent User
                      • July 31, 1989
                      • 559

                      #11
                      Re: Engine noise-ticking

                      Bob,
                      The fuel pump can create this sound. Good luck and let us know what you find.

                      Comment

                      • Anthony P.
                        Expired
                        • October 26, 2011
                        • 199

                        #12
                        Re: Engine noise-ticking

                        Originally posted by Mark Lincoln (15530)
                        Bob,
                        The fuel pump can create this sound. Good luck and let us know what you find.
                        Check the fuel pump, I have had many make this noise when I was wrenching (way back) the spring on the top of the pump can break and cause this.

                        Yes please let us know

                        Comment

                        • Patrick H.
                          Beyond Control Poster
                          • December 1, 1989
                          • 11616

                          #13
                          Re: Engine noise-ticking

                          I've seen a "ticking" noise from a water pump bearing, as well as from the front timing chain before it really went.

                          Is this a car you're going to Bowtie, or drive or what are the plans?
                          Just thinking that you may want to be careful about what you disturb or repair depending on plans.

                          And if you have photos, please share.
                          Vice-Chairman (West), Michigan Chapter NCRS
                          71 "deer modified" coupe
                          72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
                          2008 coupe
                          Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

                          Comment

                          • Bob H.
                            Very Frequent User
                            • July 31, 2000
                            • 800

                            #14
                            Re: Engine noise-ticking


                            Thanks. When I get back home I will eliminate the power steering pump and water pump and go from there. I did just put a new fuel pump on the car and did not change the rod. I will report what I find.
                            Patrick, I will have to check with someone to see if it would qualify for bowtie. The paint is original, the seat covers have been change but reast is original. The drive train is all original. The smog was removed, valve covers upgraded and radio upgraded but I have ALL the original parts! Missing origianl carb and starter. Ca car no rust at all and have origianl spare that has never been used
                            Attached Files

                            Comment

                            • Patrick H.
                              Beyond Control Poster
                              • December 1, 1989
                              • 11616

                              #15
                              Re: Engine noise-ticking

                              Original California car? If so, that's likely the only way it would have an AIR system.
                              Vice-Chairman (West), Michigan Chapter NCRS
                              71 "deer modified" coupe
                              72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
                              2008 coupe
                              Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

                              Comment

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