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Thread: Timing chain issue?

  1. #1
    Join Date
    May 2019
    Location
    Harrisburg, NC
    Age
    51
    Posts
    218

    Timing chain issue?

    To add to my EATC issue (I posted a thread a couple days ago about that), earlier today when I went to the dentist my car started making a noise that has me thinking it might be time to replace the timing chain guides as I have just shy of 180k miles. However, after listening/watching several Youtube videos, the sound I hear on my car isn't like the ones in the videos I watched. To try and describe it as best as possible, it sorta sounds like an ordinary chain's links hitting sheet metal and not like the 'clack clack clack' in the videos. It's a somewhat fast clinking/rattle sound, but not as fast as in the videos I watched. It also doesn't make the sound at idle, but when initially accelerating and when slowing down just prior to reaching idle rpms the sound occurs for several seconds; same happens when in park and I give it a little gas. Last oil change was Nov last year and approx 2,000 miles ago.

    Anyone here have audio of their MM with worn guides? I've heard about the dreaded timing chain guide issue, but have never actually heard what it sounds like.

  2. #2
    Join Date
    Jun 2017
    Location
    Oxford, PA
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    449
    You sure its not the water pump?
    2003 300A BLK/DC
    153K : runs like a swiss watch...
    395/7838

  3. #3
    Join Date
    May 2019
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    Harrisburg, NC
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    Quote Originally Posted by Agent2006 View Post
    You sure its not the water pump?
    I have no clue...I'm purely speculating that it's a timing chain issue. It was 92* out when I went to the dentist to have a crown put in this afternoon when the noise started, so I wasn't in the mood to open up the hood and pretend I knew how to troubleshoot the noise...lol. I'm just getting opinions from the 'collective' as to what it could possibly be to see if there is anything I could possibly do myself before just taking it to a garage to have it looked at/worked on.

  4. #4
    Join Date
    Jun 2008
    Location
    Waukesha, WI
    Posts
    1,390
    Take the belt off and start it. If you still hear the noise it will rule out anything driven by the belt. If the noise goes away, spin each belt driven component by hand and see if they make any noise and/or feel rough.
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  5. #5
    Join Date
    Jun 2017
    Location
    Oxford, PA
    Posts
    449
    Get a mechanics stethoscope from harbor freight or amazon, no fan blades in the way you can put the probe tip right on the water pump housing. I recently had to replace the belt tensioner on the MGM but it was more of a squeak, at 175,000 miles on it.
    2003 300A BLK/DC
    153K : runs like a swiss watch...
    395/7838

  6. #6
    Join Date
    May 2009
    Location
    Moreau Island
    Posts
    12,077
    It's been my experience that the timing chain rattle is quick and goes away once oil pressure come up to spec. It doesn't seem to come back until the car sits for a while and the oil pressure bleeds down.
    Besides the above-mentioned possible problem areas, give the exhaust manifold area a look see. I get an occasional pulse on cold days that goes away when the car warms up. I'm thinking it may be a leaky header gasket.

  7. #7
    Join Date
    May 2019
    Location
    Harrisburg, NC
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    218
    I think I figured out the problem; a rock somehow made it's way into the engine bay which got smashed into smaller pieces which clattered around making the clinking sound. Fired it up a little while ago to see if the noise would happen again and nothing...sounded just fine. Rolled back 10 feet to check for any indication of a fluid leak and discovered 3 small pieces (pea-sized) of gravel/rock/concrete, on the driveway sitting right underneath where the engine would be. Also a small line/plume of powdery like substance like you see when a rock or piece of concrete gets pulverized. Also noticed a small, single mud-dobber nest on my passenger side valve cover...lol. I need to pop the hood more often...

  8. #8
    Join Date
    Oct 2020
    Location
    Chandler Arizona
    Age
    63
    Posts
    256
    When I took my MM engine, transmission, radiator, steering, and front cross member out (and everything that goes with all that) I was amazed at the number of small rocks that came out.
    I felt like Fred Flintstone :-)
    '03 Silver Birch. Stock rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). OEM Mercury wheels, drop down mattress for under car comfort. ECD for start up (rev15a) 5/15/21.

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