Dismiss Notice



Register Today It's free! This box and some ads will disappear once registered!

4.0 Timing Chain Tensioners?

Discussion in 'Stock 2002 - 2005 Explorers' started by Roadblock1945, July 17, 2016.

^^Searches ExplorerForum.com^^



Do Not Sell My Personal Information



  1. Roadblock1945

    Roadblock1945 New Member

    Joined:
    June 14, 2011
    Messages:
    45
    Likes Received:
    2
    Trophy Points:
    8
    Year, Model & Trim Level:
    2002 Explorer XLT
    I've been trying to track a noise down in my engine for a while now. I get this cold start rattle and some other noise that I thought was timing related but It's had this noise for like the last 100k.

    I was always under the impression that the timing chain and tensioners required me to rip the motor out or at least a way a part to change them. Friend told me there are 3 and he knew 2 of them went in like bolts.

    My Explorer has 243,000+ miles on it, I've NEVER done this. I didn't even know it was a thing.

    Wondering if this might be the source of my rattle. Any guilds to doing them?

    My other concern is... If I replace these, can it cause other issues if other parts are worn? I guess what I'm asking is, is there any reason I wouldn't want to do them?

    Also where should I get them from? I'm seeing prices of 20 dollars to 125.00 dollars. Should I get factory ford?
     
  2. Support EF

    Join the Elite Explorers for $20.

    Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no advertisements, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.



  3. extra-medium

    extra-medium Active Member

    Joined:
    September 15, 2012
    Messages:
    410
    Likes Received:
    39
    Trophy Points:
    38
    City, State:
    Charlottesville, VA
    Year, Model & Trim Level:
    2002 Mercury Mountaineer
    The tensioners aren't always the issue, the plastic cassette guides are the common culprit. The passenger side tensioner is on the head right next to the exhaust manifold at the firewall, and the driver side tensioner is just to the side of the thermostat housing. You can probably buy some time with replacing the tensioners but it is an inevitable failure you will have to face at some point. Changing the timing chains is where the motor needs to come out.
     
  4. Tech By Trade

    Tech By Trade Well-Known Member

    Joined:
    May 2, 2012
    Messages:
    2,542
    Likes Received:
    161
    Trophy Points:
    83
    City, State:
    Your mom's house
    Year, Model & Trim Level:
    07 Sport Trac
    Odds are its the cassettes. You may get away with changing the 2 tensioners but the cassettes have probably shattered. Your looking at around 4k to get them replaced. Start shopping for a wrecker engine because detonation is just a matter of time. Horrible design by Ford once again.
     
  5. chefduane

    chefduane Texas Elite Explorer Elite Explorer

    Joined:
    January 22, 2013
    Messages:
    1,346
    Likes Received:
    72
    Trophy Points:
    68
    Location:
    TEXAS!
    City, State:
    Plano, TX.
    Year, Model & Trim Level:
    None: SOLD 9/16
    Also be aware that if the chain cassette guides are already damaged, you might cause *more* damage by replacing the tensioners. New tensioners more than likely will cause additional tension on the already damaged guides creating additional pressure on the cassette leading to the ultimate ka-blewie.
    I have a little startup rattle in my '98 SOHC and I did find plastic cassette parts when I did an oil change about 20k miles ago. No way am I going to change tensioners and virtually guarantee complete guide disintegration. So yes, there is an argument for NOT replacing tensioners. I'd switch to a full synth oil and filter and change it regularly. That won't guarantee against the inevitable but it might hold it off a while. Good Luck.
     
  6. Roadblock1945

    Roadblock1945 New Member

    Joined:
    June 14, 2011
    Messages:
    45
    Likes Received:
    2
    Trophy Points:
    8
    Year, Model & Trim Level:
    2002 Explorer XLT
    I have a 2002, wasn't that the year they "fixed" the issue with the plastic? Not saying it can't still be an issue or anything but just thought I would mention it.

    I've always ran Mobile 1 in this engine, change is every 5,000 or so. I've never seen any particles of anything in the oil. Always comes out clean and I never have to add a drop to this engine.

    I ordered the tensioners before I saw any of the feedback. Hmmm...

    Side note, I've had this noise for over 120,000 miles. Definitely sounds like its coming from the back of the passenger side.
     
    Last edited: July 28, 2016
  7. extra-medium

    extra-medium Active Member

    Joined:
    September 15, 2012
    Messages:
    410
    Likes Received:
    39
    Trophy Points:
    38
    City, State:
    Charlottesville, VA
    Year, Model & Trim Level:
    2002 Mercury Mountaineer
    I think the "fix" was in 04 or 05, but some of the 4.0 mustangs had the same issue. You can try to put a new tensioner in the passenger side head but most likely you are gonna need a full timing chain swap.
     
  8. Sweersa

    Sweersa Active Member

    Joined:
    September 1, 2014
    Messages:
    204
    Likes Received:
    6
    Trophy Points:
    28
    City, State:
    Marne, MI
    Year, Model & Trim Level:
    2005 Ford Explorer XLT
    I have an '05 4.0 and it has made bad timing chain noise for a long time now. Some mornings it sounds very bad for a minute or so after a cold start. I wait for the noise to stop, then drive to point B. I can hear it while driving too, the noise is really noticeable next to a guardrail or another vehicle with the windows down. Just under 200,000 miles. I'm going to drive her until she blows, then have a new engine put in it. I don't really want to drop 3-4K on having an engine with 200,000 miles serviced when I can have a new one dropped in for a little more.
     
    • Like Like x 1
  9. extra-medium

    extra-medium Active Member

    Joined:
    September 15, 2012
    Messages:
    410
    Likes Received:
    39
    Trophy Points:
    38
    City, State:
    Charlottesville, VA
    Year, Model & Trim Level:
    2002 Mercury Mountaineer
    The shop i took mine to for timing chain repair was cheaper to have an engine installed compared to having mine fixed.
     
  10. Tech By Trade

    Tech By Trade Well-Known Member

    Joined:
    May 2, 2012
    Messages:
    2,542
    Likes Received:
    161
    Trophy Points:
    83
    City, State:
    Your mom's house
    Year, Model & Trim Level:
    07 Sport Trac
    The "fix" did nothing. The new are as bad as the old.
     
  11. Leo76

    Leo76 New Member

    Joined:
    August 6, 2016
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    City, State:
    San Diego, CA
    Year, Model & Trim Level:
    1997 explorer xlt
    So what you guys are saying is.....it is better to get a different engine that to fix the timing chain?
     
  12. Leo76

    Leo76 New Member

    Joined:
    August 6, 2016
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    City, State:
    San Diego, CA
    Year, Model & Trim Level:
    1997 explorer xlt
    So it's better to get a different engine than to replace the timing chain?
     
  13. extra-medium

    extra-medium Active Member

    Joined:
    September 15, 2012
    Messages:
    410
    Likes Received:
    39
    Trophy Points:
    38
    City, State:
    Charlottesville, VA
    Year, Model & Trim Level:
    2002 Mercury Mountaineer
    It is cheaper right now, yes. But my reasoning to fix my engine even though it was more was a tough decision. I have been driving my Mountaineer for 4 years. I know it's quirks and how it runs. My motor had 145k when I fixed the timing chains. The motor the shop was going to sell me had 86k miles on it. I know with my motor that it had fresh chains and the whole kit, whereas the used motor they were gonna sell me was all original. I didn't know how long that motor would last me until I needed to do major repairs to it. So, even though I spent more money now, I feel that I saved myself money in the long run by not getting a used motor replacement.
     
  14. Hotsauce80

    Hotsauce80 New Member

    Joined:
    July 1, 2016
    Messages:
    23
    Likes Received:
    0
    Trophy Points:
    1
    City, State:
    Baltimore Md
    Year, Model & Trim Level:
    2005 Ford Explorer XLT RS
    Just my opinion, but like everyone else, I too have the chain noise. I was about to try tensionsers too, but with the chance it could do more harm, possibly speed up the damage, I decided to let it be one of those parts to just leave alone. Put the money into something else you may need on the truck.
     

Share This Page







We Support Our Troops!