Dismiss Notice



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

4.0 SOHC - when did it become reliable?

Discussion in 'Under the Hood' started by adowns, June 25, 2011.

  • Searches ExplorerForum.com
    1. adowns

      adowns New Member

      Joined:
      June 20, 2011
      Messages:
      6
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Alabaster, AL
      Year, Model & Trim Level:
      1998 Mountaineer
      Did the 4.0 SOHC engine ever become a reliable 200k mile engine?

      After what year is it safe to purchase an Explorer with this engine?

      If the timing chain problems have been fixed under warranty, does it become a reliable 200k engine, or is it good for only another 50k?

      Do rebuilt engines (like a Jasper engine) fix the timing chain issues or are they about the same as the original engine as far as reliabilty?

      I would like to buy a late 90's early 2000's Explorer. They seem like a lot of SUV for the money, but I am leery of the 4.0 SOHC engine which seems to be the engine in most of them.
       
      Last edited: June 26, 2011
    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.



    3. swetrid

      swetrid Well-Known Member

      Joined:
      September 30, 2010
      Messages:
      1,896
      Likes Received:
      3
      Trophy Points:
      0
      City, State:
      Reading Pa
      Year, Model & Trim Level:
      1999 Eddie Bauer
      It has always has issues of some sorts. 97-02 are the most problematic.
       
    4. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

      Joined:
      May 26, 2009
      Messages:
      10,554
      Likes Received:
      196
      Trophy Points:
      93
      City, State:
      Greenville, SC
      Year, Model & Trim Level:
      00 Sport FI, 03 Ltd V8
      my opinions

      I believe all of the timing chain related improvements were incorporated in the 2002 and later models. An engine rebuilt or repaired after 2002 could have the best components available. There are less expensive and inferior aftermarket timing chain replacement kits available.

      A forum member with a late model recently experienced a balance shaft tensioner failure at around 45K miles. Many members have over 200,000 miles on their engines with no timing chain issues. Maintenance and driving habits affect the longevity of the timing chain components. My 2000 engine was poorly maintained by previous owners and the original rear timing chain guide broke at 150,000 miles. I added a pre-oiler to hopefully extend the life of my timing chain components.

      Volvo requires replacement of the timing belt and tensioner every 70,000 miles. Most modern overhead cam engines require a similar replacement interval. Ford's mistake was making it necessary to remove the engine to replace the rear cassette.

      If you're not a home mechanic look for a 5.0L V8/4R70W powertrain.
       
    5. safn1949

      safn1949 Active Member

      Joined:
      April 1, 2008
      Messages:
      934
      Likes Received:
      3
      Trophy Points:
      18
      Location:
      Brookings Oregon
      Year, Model & Trim Level:
      M60A1 my first offroader
      I agree on the 5.0,mine had 182,000 when I sold it and it ran like crazy.Always started and ran very smooth,never a problem with the tranny either.:D
       
    6. adowns

      adowns New Member

      Joined:
      June 20, 2011
      Messages:
      6
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Alabaster, AL
      Year, Model & Trim Level:
      1998 Mountaineer
      Thanks all for the information. Now I see the situation. If routine timing chain maintenance were not so difficult this wouldn't be an issue. I will look for a post 2002 owned by one of those "change oil every 3000 miles" owners.
       
    7. XLT

      XLT Active Member

      Joined:
      January 21, 2005
      Messages:
      815
      Likes Received:
      1
      Trophy Points:
      16
      City, State:
      Wausau, WI
      Year, Model & Trim Level:
      1998 Sport SOHC 4X4
      You might want to look for atleast a 2003 or newer. The 2002 are know to be more problematic since that was the first year of the 3rd gen explorer.
       
    8. waskly

      waskly Well-Known Member

      Joined:
      August 21, 2010
      Messages:
      2,190
      Likes Received:
      1
      Trophy Points:
      0
      City, State:
      Crooklyn NY!
      03 or 04 engines have the updated black guilds in them.
       
    9. 01sporty

      01sporty Member

      Joined:
      March 19, 2011
      Messages:
      53
      Likes Received:
      1
      Trophy Points:
      0
      City, State:
      new salisbury indiana
      Year, Model & Trim Level:
      2001 sport 2wd
      being an employee of jasper engines i can tell you this, the guides are different from stock. i dont really know if its because of the issue being discussed i could find out tho. if you would like for me to
       
    10. adowns

      adowns New Member

      Joined:
      June 20, 2011
      Messages:
      6
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Alabaster, AL
      Year, Model & Trim Level:
      1998 Mountaineer
      To 01sporty: I've often wondered if engine rebuilders use better than stock parts because they can see first hand what the weak spots are as they tear down the core engines. Or... do they use cheaper parts because the second engine will probably outlast the car which already has lots of miles and the car will break down due to some other cause or be sold to another owner.
       
    11. 01sporty

      01sporty Member

      Joined:
      March 19, 2011
      Messages:
      53
      Likes Received:
      1
      Trophy Points:
      0
      City, State:
      new salisbury indiana
      Year, Model & Trim Level:
      2001 sport 2wd
      we use high quality parts, we partner with alot of the aftermarket parts companies in order to get better pricing, kinda one hand washes the other they sell more parts we get better prices, our engines are rebuilt to factory specs. so they are as good as new. i cant speak for other facilities but i imagine they wouldnt remain competetive if they sold an inferior product. in fact we remanufacture engines for the long life postal vehicles and those engines have to stand up to the torture that the postal service puts them thru, and trust me when i say this those engines are absolutely put thru the ringer
       
    12. mr cribb

      mr cribb US Army Retired Elite Explorer

      Joined:
      December 16, 2010
      Messages:
      2,308
      Likes Received:
      41
      Trophy Points:
      68
      City, State:
      Harviell, MO
      Year, Model & Trim Level:
      94 Chevy Z71, 93 X EB
      Well I do know that my first X (2000 EB 4.0) had head gasket issues, I checked into repairing it. Local shops wanted atleast 3k, ford wanted 3800 just to repair, and a new motor was 4k.

      I got it because he price was right ($500).... I later traded it off after finding out the repair cost.

      I'm in agreement if I was to have a later model X, I'd get the 5.0 motor.
       
    13. Arian

      Arian New Member

      Joined:
      September 14, 2016
      Messages:
      2
      Likes Received:
      0
      Trophy Points:
      1
      Year, Model & Trim Level:
      1997 Ford explorer 4.0
      I have a 4.0 sohc with 200,000 and have only had to just keep up the maintenance I'm very pleased with it
       
    14. Zagnut

      Zagnut Member

      Joined:
      April 20, 2018
      Messages:
      85
      Likes Received:
      5
      Trophy Points:
      8
      Location:
      Detroit, a third world country.
      City, State:
      Detroit, a third world country
      Year, Model & Trim Level:
      2006 4.0L Ed B Explorer
      Callsign:
      haven't tested yet, despite having dual band radios.
      2006 Eddie B 4.0L with 202k. Sixth owner, no death rattle.

      Don't have maintenance records for it, but I know it was a fleet/rental vehicle. It must've been maintained, because it runs pretty good...aside from rotted suspension bits.
       
    15. Everett Bartz

      Everett Bartz New Member

      Joined:
      October 31, 2018
      Messages:
      6
      Likes Received:
      0
      Trophy Points:
      1
      City, State:
      El Paso TX
      Year, Model & Trim Level:
      2005 XLT
      That demarcation date is March 2002.
       
    16. domct203

      domct203 Pilots The Beast Elite Explorer

      Joined:
      October 11, 2017
      Messages:
      384
      Media:
      100
      Albums:
      3
      Likes Received:
      93
      Trophy Points:
      38
      City, State:
      CT
      Year, Model & Trim Level:
      2002 Explorer XLS
      My 2002 (built 4/02) SOHC V6 has 128K and runs great. The motor is strong and idles very smooth.

      Previous owner handed me a 1” thick folder of maintenance receipts, and I’m continuing that maintenance. I see no reason I shouldn’t get 70-80K more if I take care of the motor.

      Mobil 1 and a Wix XP every 4K.
       
    17. imp

      imp Well-Known Member

      Joined:
      November 12, 2009
      Messages:
      4,154
      Likes Received:
      372
      Trophy Points:
      103
      Location:
      West-Central AZ along the Colorado River
      Year, Model & Trim Level:
      59 Ranchero F250 D'Line
      '04 V-6 SOHC, 165k, no work ever done on chains yet. Minor failures, yes, wheel bearings, TCC solenoid quit. Beyond that, no problems. Happy, but still worried. imp
       
    18. 410Fortune

      410Fortune Snow Season Staff Member Moderator

      Joined:
      August 3, 2000
      Messages:
      23,074
      Likes Received:
      432
      Trophy Points:
      113
      City, State:
      7B Panhandle
      Year, Model & Trim Level:
      B2 Mod
      I have a 2006 SOHC 4.0 Ranger 4x4 5 speed outside with 320K miles on the stock engine, runs fine. Owner changes oil every 3-5000K miles and uses synthetic with Motorcraft filter.
      He has never done any maintenance other then that and a fuel pump.
      The later model 4.0 are very good, clean oil changes with full synthetic are the KEY
       
      • Like Like x 1
    19. MrQ

      MrQ Take the Bull by the Horns Elite Explorer Moderator Emeritus

      Joined:
      October 5, 2008
      Messages:
      2,557
      Media:
      18
      Albums:
      2
      Likes Received:
      112
      Trophy Points:
      73
      City, State:
      Stafford, TX
      Year, Model & Trim Level:
      '93 Limited
      Callsign:
      MrQ
      Also use a Motorcraft oil filter only. And keep an eye on oil pressure.

      These engines are just super sensitive to the quality of the oil and unfortunately Ford did not make synthetic a requirement on these engines (ultimately it is up to the owner to maintain the vehicle, but making people aware of the reasons might have gone a long way to keeping these motors functional)

      When properly maintained these engines can last and they have a decent powerband to top it off. (make more HP than the V8 and a little less torque)
       
      • Like Like x 1
    20. roscoe 0202

      roscoe 0202 Elite Explorer

      Joined:
      February 3, 2014
      Messages:
      341
      Likes Received:
      70
      Trophy Points:
      38
      City, State:
      salt lake city utah
      Year, Model & Trim Level:
      1999 explorer sport
      I think the sohc gets a bad rap because you have to pull the engine to replace back chain look at overhead cam chain driven and it has to be changed periodically
      roscoe
       
      • Like Like x 1
    21. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

      Joined:
      May 26, 2009
      Messages:
      10,554
      Likes Received:
      196
      Trophy Points:
      93
      City, State:
      Greenville, SC
      Year, Model & Trim Level:
      00 Sport FI, 03 Ltd V8
      That's a valid statement. However, Ford's 4.0L SOHC implementation of the camshaft chain tensioners is less reliable than many others. Below is a photo of my 4.6L DOHC V8.
      OilPan.jpg
      The cassette structural support is composed of metal. Only the chain wear surface is "plastic". On the SOHC V6 the cassette structural support is "plastic" that fails due to thermal and vibration fatigue.
      RCasset.jpg
       

    Share This Page







    We Support Our Troops!