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Thread: Replace Broken Guides

  1. #1
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    Replace Broken Guides

    I was out at the market, when I came out and started the car, I heard a little pop.
    As soon as that happened, the car started to run bad and backfire. I limped the car home.
    I'm assuming the plastic guides broke. This means oil pan will need to be pulled also. (I have a leaky oil pan BTW)
    Mechanic thinks the best way to attack this repair is to pull the engine entirely.
    Labor amount is $1300 for repair, not including parts. Does this seam reasonable?

  2. #2
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    Sure it isnít a blown spark plug? That would give the same symptoms.


    If not it sounds more like a tensioner snapped.


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  3. #3
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    I was watching a video of a Aviator engine. The broken guide lets the chain flop around causing this condition. A broken spark plug will continue to make a popping noise every revolution.
    I do not have this condition.


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  4. #4
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    How many miles on engine?
    Reinhart flash, 4:10 gears, kooks headers/x-pipe, 18" magnaflow, underdrive pulleys, metco lower control arms, magnflow muffler,magnapack bullet muffler tailpipe extensions, denso plugs and thermostat.
    Dynojet 1/13/04: HP-290.5 TQ-302.8

  5. #5
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    The car has 265,000 miles.


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  6. #6
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    Yes the engine needs pulled to do the oil pan.
    Neil
    2003 Mercury Marauder - DBP/DC
    #195, Eaton Swapped, Waiting for Engine
    2003 Mercury Marauder - BLK/DC
    #2821, 80K Mile Tagalong 2 - Wife's Daily Driver
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    1964 Mercury Marauder - BLK/BLK
    390FE, 4D HT, Staggered 18's, Cruiser
    1986 Buick Regal Grand National
    Stock Block/Heads 11.08 @ 122.39mph, 25psi

    Originally Posted by Zack
    The only diagnosis is changing it.
    I have one if you need it.
    The AEM pumps don't burn up FPDM's

    Diagnosis at my house is inspecting wires. Drink a beer. Talk about what to do next. Drink a beer. Call Jaydees to bring over his spare FPDM. Drink beer waiting for him. When he shows up with the part look at it and say hold my beer while I get in the trunk. Replace part. Cannot test drive because............ Diagnosis.

  7. #7
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    Quote Originally Posted by BLACKMARAUDER04 View Post
    The car has 265,000 miles.


    Sent from my iPhone using Tapatalk
    Thanks, I am at 125000 and starting to be concerned. Keep us posted on what you find.
    Reinhart flash, 4:10 gears, kooks headers/x-pipe, 18" magnaflow, underdrive pulleys, metco lower control arms, magnflow muffler,magnapack bullet muffler tailpipe extensions, denso plugs and thermostat.
    Dynojet 1/13/04: HP-290.5 TQ-302.8

  8. #8
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    Replace Broken Guides

    Im going to wait 3-4 weeks before I get it fixed. Luckily I have my silver to drive (180,000 miles) and my Lincoln MKS W/ Ecoboost (103k) and itís faster than the Marauder. Im going to add a real oil pressure gauge and replace the many burnt out bulbs in the dash and both meters. Im also going to get the HVAC bulbs replaced and get the heater switch re-soldered.


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    Last edited by BLACKMARAUDER04; 04-22-2021 at 07:19 AM.

  9. #9
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    I'm guessing this is the timing chain guides?
    If they break what causes the poor running and back firing, a damaged sensor?
    I would think if it was valve timing it would be pretty well fatal wouldn't it?

  10. #10
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    Quote Originally Posted by johnjamis View Post
    Thanks, I am at 125000 and starting to be concerned. Keep us posted on what you find.
    OEM being plastic it is guaranteed they will need replacing some time. Do them with metal ones before they get bad requiring pan removal = much cheaper.
    https://www.mercurymarauder.net/foru...61#post1515961

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  11. #11
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    If the guides break, the timing chain starts to flop around. This causes the timing to be off. Also running long in this condition can damage the sprockets. I had to limp home for about 2 miles.


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  12. #12
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    I'm trying to understand this in case it happens to me.
    What timing goes off? Valve timing or ignition timing?
    I would think if it's valve timing the motor would be toast.

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