As of this 2020 writing, I am just dumb lucky, not having had any TimingChain component failure with this 20Year old V6-4.0L~SOHC engine; the only item noticed is momentary rattling with very cold morning starts. The recent removal of the lower oil pan & pumps screen was clean without any TimingGuide pieces or other surprises found in the Pan\Screen\Girdle. In 2010, on first becoming aware of the notorious Tensioners+Guides in this engine, I had a trusted mechanic install new Oil Pressurized TimingTensioners, followed by an Oil Flush+Change; I have since used lighter 0w30\0w20~FullSyn oil. Now the engine is 100kMiles+10Yrs older & is (or was) overdue for new OilPressurized Tensioners; both myself & vehicle have retired from daily commutes, & it's assigned to snow plow duty or occasional substitute for the car, thus wife assigned me this maintenance chore, as detailed below.
The IACValve SetScrew was also adjusted, lowering StartingFlare by approximately 500rpm, as part of an effort to generally reduce engine wear during StartUp, specificly to reduce wear on TimingChainGuide components.

TimingTensioner Tools

TimingTensioner At EngineLeftDriversSide

Compared to the right Tensioner below, the left is harder to access with little working room between the Manifold & TStat Housing; a TempSensor on the TStat Housing was moved to improve clearance; click here for details.

TimingTensioner At EngineRightPassengerSide

EngineColdStart Procedure

When a V6~4.0L~SOHC Engine hasn't run for 12 hours or longer, this EngineColdStart routine is recommended
for general PreLubrication of the Engine critical components & specificly to PrePressurize the TimingTensioners.

  • Turn Key To RUN Not START, Let InstrumentCluster Lamp+BuzzerTest Complete
  • Push+Hold GasPedal To Floor, InstrumentCluster OilPressureNeedle Should Be At Zero
  • Turn Key To START, Let Engine CRANK Without Starting Until OilPressureNeedle Moves Or ~10secs
  • Release GasPedal, Let Engine START, Then Allow Key To SpringReturn To RUN
  • InstrumentCluster OilPressureNeedle Should Quickly Rise+Hold At MidGage Position

Links To Related Info

Thanks go to the brave souls who've preceded me in similar adventures & freely shared their experience below:

https://web.archive.org/web/20200710121000if_/http://www.underhoodservice.com/exploring-service-needs-on-the-ford-4-0l-v6-engine
https://web.archive.org/web/20200527100537if_/http://workshop-manuals.com/ford/explorer_2wd/v6-245_4.0l_sohc_vin_e_efi/engine_cooling_and_exhaust/engine/timing_components/timing_chain_tensioner/component_information/technical_service_bulletins/all_other_service_bulletins_for_timing_chain_tensioner/99-26-5/dec/99/engine_knocking_noise_from_left_side_at_start_up#page=0
https://www.explorerforum.com/forums/threads/sohc-v6-replace-rebuild-or-remanufactured.438266
https://www.explorerforum.com/forums/threads/04-oil-pan-removed-and-found-this.471051
https://www.explorerforum.com/forums/threads/look-what-i-found-in-my-oil-pan-what-is-it.472148
https://www.explorerforum.com/forums/threads/starting-my-00m12-installation.261439
https://www.explorerforum.com/forums/threads/98-sohc-cold-start-idle-problem.61152
https://www.explorerforum.com/forums/threads/timing-chain-pn-for-replacement.486638
https://www.explorerforum.com/forums/threads/4-0-sohc-rear-timing-chain-tensioner-oil-leak.395421
https://www.explorerforum.com/forums/threads/timing-chain-rattle-resolution-process-sohc-v6.278100
https://www.explorerforum.com/forums/threads/sohc-v6-timing-chain-parts-removal-procedure.316471
https://www.explorerforum.com/forums/threads/retitled-sohc-engine-removal-rebuild.479104
https://www.explorerforum.com/forums/threads/timing-chain-pictures.161701
https://www.explorerforum.com/forums/threads/high-mileage-sport-trac-250k-and-counting.478260
https://www.explorerforum.com/forums/threads/sohc-v6-timing-chain-related-pns.316665
https://www.explorerforum.com/forums/threads/sohc-v6-timing-chain-parts-sources.317039
https://www.explorerforum.com/forums/threads/sohc-4-0-no-oil-pressure-at-upper-tensioner.402152
https://www.explorerforum.com/forums/threads/4-0-sohc-timing-noise.473831
https://www.explorerforum.com/forums/threads/install-manual-polaris-rzr-tensioners-in-4-0-sohc.483728
https://www.explorerforum.com/forums/threads/rzr-manual-tensioner.482886
https://www.explorerforum.com/forums/threads/source-for-sohc-hydraulic-chain-tensioner-seal-solved.485606
https://www.explorerforum.com/forums/threads/4-0-sohc-timing-kits.485735
https://www.explorerforum.com/forums/threads/disable-balance-shaft-by-removing-chain.483243
https://www.explorerforum.com/forums/threads/balance-shaft-myth-debunked.255402
https://www.explorerforum.com/forums/threads/explorer-balance-shaft.221345
https://www.explorerforum.com/forums/threads/2003-4-0l-timing-chain-balance-shaft-question.485319
https://www.explorerforum.com/forums/threads/timing-chain-replacement-and-balance-shaft-delete.437135
https://www.explorerforum.com/forums/threads/balance-shaft-tensoner-parts-found-in-pan.451801
https://www.explorerforum.com/forums/threads/balance-shaft-chain.376001
https://www.explorertalk.com/threads/99-4-0-sohc-timing-chain-repairs.45084
https://sohcreplace.blogspot.com/2008/06/1997-2005-4.html
https://www.fordtruckfanatics.com/forum/showthread.php?t=40715
https://www.therangerstation.com/forums/index.php?threads/surprises-when-doing-tensioner-and-guide-replacement.189696/page-2
https://www.therangerstation.com/forums/index.php?threads/tensioners-replacement-fail.156055
https://www.therangerstation.com/forums/index.php?threads/aftermarket-sohc-timing-chain-guides.185509
https://www.fordrangerforum.com/project-logs/101016-yeller-2002-4-0-sohc-engine-rebuild.html
https://www.v6mustang.com/threads/4-0-sohc-rebuild.277619
https://www.trucktrend.com/how-to/engine/1707-jasper-engines-remanufactured-crate-engine-and-transmission-in-an-01-ford-ranger
https://www.explorerforum.com/forums/threads/replace-all-4l-timing-chain-guides-without-removing-engine-or-special-tools.485343
https://www.explorerforum.com/forums/threads/2001-ford-explorer-sporttrac-oilpressurized-timing-tensioners-replaced.488855
https://www.ranger-forums.com/4-0l-ohv-sohc-v6-tech-33/2001-4-0-v6-timing-chain-possible-fixes-157991
https://www.ford-trucks.com/forums/1631166-sohc-tensioners-question.html

https://youtu.be/nM_Tt2hjbj0?t=32 Timing Fail Rattle
https://youtu.be/nM_Tt2hjbj0?t=358 Timing Fail Rattle
https://youtu.be/bRQiFIPTric?t=141 Timing Fail Rattle
https://www.therangerstation.com/forums/index.php?threads/no-compression-in-4-0-sohc.191436 Timing Fail ValveDamage

https://youtu.be/MHHzXUtmErg?t=1 Timing JackTensioner+LeftGuide+RghtGuide Fail
https://youtu.be/LB1UNBeaWJQ?t=15 Timing JackTensioner Fail
https://youtu.be/b2NvDAShANE?t=136 Timing JackLowerGear wOut\With BalanceShaft
https://youtu.be/eCKOHVdv98c?t=1 Timing JackUpperGear+Chain+Guide+Tensioner Removal
https://youtu.be/HVROVcmLpQU?t=1 Timing JackUpperGear+Chain+Guide+Tensioner Install

https://youtu.be/PAv6oCDXAV0?t=1 Timing Left+RghtTensioner
https://youtu.be/ARiWMRnrYTg?t=34 Timing Left+RghtTensioner Fail
https://youtu.be/q_hzBq11HWQ?t=1 Timing Left+RghtTensioner Prime=HardInstall Oiled=EasyInstall
https://youtu.be/-5mI-ah4qRQ?t=1 Timing LeftTensioner Replace
https://youtu.be/j5fno9JdZaA?t=3 Timing Left+RghtTensioner Replace
https://youtu.be/92e5Qh42ULI?t=93 Timing LeftTensioner Fail
https://youtu.be/DfVPrSAd3Og?t=1 Timing LeftTensioner Hack
https://youtu.be/YSxAxQFZ0AA?t=1 Timing LeftGuide Replace
https://youtu.be/9_3inbJoYyA?t=0 Timing LeftOilRestrictorBypass Mod

https://www.explorerforum.com/forums/threads/ford-timing-chain-tensioner-cutaway.490702 Timing RghtTensioner CutAway
https://youtu.be/D9QfX4SO7DM?t=0 Timing RghtTensioner CutAway
https://youtu.be/P4N5E_RfYpE?t=1 Timing RghtTensioner Replace
https://youtu.be/u3WyE4nOmHs?t=1 Timing RghtGuide Fail
https://youtu.be/gnHB1VA6C2M?t=12 Timing RghtGuide Hack
https://youtu.be/9_3inbJoYyA?t=1 Timing RghtOilByPass Mod

https://youtu.be/_PpVvGpO0tg?t=1 Timing BalanceTensioner Fail
https://youtu.be/LyGQsHZEpXM?t=1 Timing BalanceShaft
https://youtu.be/52_ehMNpDps?t=1 Timing BalanceShaft
https://youtu.be/LyGQsHZEpXM?t=0 Timing BalanceShaft
https://youtu.be/52_ehMNpDps?t=0 Timing BalanceShaft
https://youtu.be/6_u6Me2WooA?t=1 Timing BalanceShaft Delete

https://youtu.be/xKTZMl35-hw?t=1 Timing ReBuild
https://youtu.be/C3EIC2g2nkI?t=13 Timing ReBuild
https://youtu.be/oh-RueWyX_Y?t=1 Timing ReBuild
https://youtu.be/LVnG10Rpi4M?t=54 Timing ReBuild
https://youtu.be/wMQx-RRF0Wk?t=1 Timing ReBuild
https://youtu.be/xAEA4y8bnIA?t=14 Timing ReBuild
https://youtu.be/WJax1KPtRB8?t=17 Timing ReBuild CloyesParts Not FordParts
https://youtu.be/GX1oMHwm1JQ?t=1 Timing ReBuild Left+RghtTensioners SwappedWrong
https://youtu.be/pwUmIDTX0gs?t=9 Timing ReBuild WithEnginPull
https://youtu.be/Da7SK6uCE8Y?t=3 Timing ReBuild EngineInStall
https://youtu.be/-6LC3pkw6z8?t=0 Timing Rebuild wOutEnginPull 1of4
https://youtu.be/5HjgWJyte2Y?t=0 Timing Rebuild wOutEnginPull 2of4
https://youtu.be/F5wNbgxvd7g?t=0 Timing Rebuild wOutEnginPull 3of4
https://youtu.be/x27E49pM11Y?t=0 Timing Rebuild wOutEnginPull 4of4
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