Dismiss Notice



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

4.0 Timing Guide major wear spots.

Discussion in 'Elite Explorer 911!' started by Concours.John, December 10, 2017.

  • Searches ExplorerForum.com
    1. Concours.John

      Concours.John Elite Explorer

      Joined:
      November 15, 2017
      Messages:
      7
      Likes Received:
      0
      Trophy Points:
      1
      City, State:
      Dayton, Ohio
      Year, Model & Trim Level:
      2002 , 1996 Ford Explorer
      I have been pouring over this issue here. Having a near 200k 4.0 2002 I know the repair is coming. Does anyone have pictures of guides prior to destruction detailing major contact points? Understanding failures are due to lack of reinforcement, plastic involved, etc. I would like to see if it is possible to reengineer this. I am not at this point trying to sell anything just have resources. It may be cost prohibitive but I have access to state of the art technology we use to replicate/improve parts for vintage Ferrari, Maseratti, and other Italian cars. There will obviously be a need for stamping of metal reinforcement and have to work on suitable composite guide surface. We have access to retired DOD liquid 3D printers and CAD welders to develop prototypes. Should something come of this I want Admin to know I will gladly pay as sponsor. I just need as much information right now as possible on these guides, break points, etc, and heavy wear points. I am in same boat and it will cost a ton to prototype this. However a guide that may wear to 150k but prevent destruction is goal or longer if preventative tensioner replacement service done.
      Thanks for any information. If it has been done, tried, or failed please point me to thread.

      John

      Yes I may be crazy but my wife loves the truck.
       
      Last edited: December 10, 2017
    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 ads, 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.


      to hide adverts.
    3. david4451

      david4451 Active Member

      Joined:
      February 9, 2015
      Messages:
      190
      Likes Received:
      14
      Trophy Points:
      28
      City, State:
      cotabato
      Year, Model & Trim Level:
      2001 ford sport trac
      The weak spot in these timing chain components started with a poor choice of the plastic used, this I believe has been addressed, along with better primary tensioners(crank to jackshaft) and balance shaft guides on 4 x 4.
      All considered the improvements really add up to nought because it did not address the real problem on COLD start up, where the hydraulic tensioners are absent of oil and they rattle until the oil pressure builds up in tensioners.
      You can imagine the force exerted on the plastic guides by the chain being slack for 3 to 10 seconds, on cold start up. This leads to the plastic guides fatiguing and breaking, causing jumping time and bent valves.
      My Sport Trac is low mileage(41000) and this inevitable failure was grinding my brain! I live in Philippines (Brit) pushing 67 and probably this is the last vehicle I'll own, so I wanted it to survive(it had the rattle).
      If I could re-engineer this set up, start with the hydraulic tensioners, stronger springs and or drill & thread centre and put limiting cushioned stop. This would probably stop the destructive rattle. This would be relatively easy to do and give the plastics more life.
      What stops everyone fixing these timing components is its a big job, engine out etc etc. Even if a bullet proof fix is available, most would not do it.
      As for me I'm going the change my timing components, which are now not rattling because I fitted a pre oiler(see thread"pre lube & centrifugal oil filters") but don't trust my original timing parts. The pre-oiler will of course be used with new components and out live me. Transmission next!!!
       
    4. Tech By Trade

      Tech By Trade Well-Known Member

      Joined:
      May 2, 2012
      Messages:
      2,131
      Likes Received:
      76
      Trophy Points:
      68
      City, State:
      Your mom's house
      Year, Model & Trim Level:
      07 Sport Trac
      Nothing has been addressed, they are still junk. If you take a guide, and replicate everything that is plastic with steel, and then replace the running surface with a plastic or teflon runner of some sort you will have a bullet proof engine. This would also allow for increased spring pressure in the current tensionsers without fear of the plastic shattering. That and a v8 style hydraulic tensioner on the primary jackshaft chain instead of the piss poor leaf spring design. A couple of us have actually sent these ideas to dorman, without response.
       
      Last edited: December 11, 2017
      • Thanks Thanks x 1
    5. david4451

      david4451 Active Member

      Joined:
      February 9, 2015
      Messages:
      190
      Likes Received:
      14
      Trophy Points:
      28
      City, State:
      cotabato
      Year, Model & Trim Level:
      2001 ford sport trac
      If you don't address the rattle on cod start, if the metal/Teflon doesn't fatigue then it may well transfer to the chains failing.
       

    Share This Page







    We Support Our Troops!