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  1. #1

    Default 7.4 lifter noise

    First time post i have a 32 luhrs 32 with marine power 454 i am getting a ticking sound so had a mechanic take it apart and replace all lifters put back together started and the ticking came back any ideas

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,766

    Default Re: 7.4 lifter noise

    if the rocker arm nut didn't back off and the rocker arms didn't have excessive wear, I'd suspect the cam lobe(s) are worn...you can measure them with a dial indicator.

  3. #3

    Default Re: 7.4 lifter noise

    I have the same problem did you ever find the problem. I replaced the Mercruiser non adjustable rockers with comp cams roller rockers with no effect on the ticking I was planning on removing the EFI intake to get at the lifters to replace them may be I should also replace the cam.




  4. #4

    Default Re: 7.4 lifter noise

    I did not mine has now developed what sounds like a low end rap. So it looks like a new or at least rebuilt engine is in oder.

  5. #5
    Join Date
    Nov 2012
    Location
    South of Boston
    Posts
    61

    Default Re: 7.4 lifter noise

    Rule of thumb is to replace the camshaft if the lifters are worn. Putting new lifters on a worn out camshaft will result in quickly worn out lifters, kind of a waste of time and money.

  6. #6
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,092

    Default Re: 7.4 lifter noise

    Quote Originally Posted by seahound View Post
    i am getting a ticking sound so had a mechanic take it apart and replace all lifters put back together started and the ticking came back any ideas
    A bit off topic...... but I'd like to ask who diagnosed the problem?
    If the mechanic diagnosed it, I would think twice about paying for work that did not correct the problem.


    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

    Please... no PMs! Post your questions on the forum.

  7. #7
    Join Date
    Oct 2012
    Location
    sacramento, ca.
    Posts
    307

    Default Re: 7.4 lifter noise

    Quote Originally Posted by hottoddie View Post
    Rule of thumb is to replace the camshaft if the lifters are worn. Putting new lifters on a worn out camshaft will result in quickly worn out lifters, kind of a waste of time and money.
    absolutely correct
    *** In comparing the virtues of various calibers, using hollow point ammo: it is absolutely undeniable that, while a 9 mm or .40 S&W may or may not expand, a .45 will never shrink. ***

  8. #8
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,092

    Default Re: 7.4 lifter noise

    Quote Originally Posted by hottoddie
    Rule of thumb is to replace the camshaft if the lifters are worn. Putting new lifters on a worn out camshaft will result in quickly worn out lifters, kind of a waste of time and money.
    Quote Originally Posted by crankbait View Post
    absolutely correct
    Unless of course this was a roller cam w/ roller cam followers.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

    Please... no PMs! Post your questions on the forum.

  9. #9

    Default Re: 7.4 lifter noise

    sorry I took so long to get back but here is what I found and did. I took out both engines and rebuilt both. The one making all the noise had a spun bearing. My other one had a bent push rod and sucked water through the exhaust valve . Just put them back in covered boat and waiting for spring.

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