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 Immediately Rise+Hold At Normal Running Position

Links To Related Info

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

http://web.archive.org/web/20200710121000if_/http://www.underhoodservice.com/exploring-service-needs-on-the-ford-4-0l-v6-engine
http://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
http://sohcreplace.blogspot.com/2008/06/1997-2005-4.html
http://www.fordtruckfanatics.com/forum/showthread.php?t=40715
http://www.therangerstation.com/forums/index.php?threads/surprises-when-doing-tensioner-and-guide-replacement.189696/page-2
http://www.therangerstation.com/forums/index.php?threads/tensioners-replacement-fail.156055
http://www.therangerstation.com/forums/index.php?threads/aftermarket-sohc-timing-chain-guides.185509
http://www.fordrangerforum.com/project-logs/101016-yeller-2002-4-0-sohc-engine-rebuild.html
http://www.v6mustang.com/threads/4-0-sohc-rebuild.277619
http://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
http://www.ranger-forums.com/4-0l-ohv-sohc-v6-tech-33/2001-4-0-v6-timing-chain-possible-fixes-157991
http://www.ford-trucks.com/forums/1631166-sohc-tensioners-question.html
https://www.explorerforum.com/forums/threads/ford-timing-chain-tensioner-cutaway.490702 TimingTensioner Rght CutAway
http://youtu.be/D9QfX4SO7DM?t=0 TimingTensioner Rght CutAway
http://youtu.be/9_3inbJoYyA?t=0 TimingTensioner Left OilRestrictorBypass
http://youtu.be/-6LC3pkw6z8?t=0
http://youtu.be/5HjgWJyte2Y?t=0
http://youtu.be/F5wNbgxvd7g?t=0
http://youtu.be/x27E49pM11Y?t=0
http://youtu.be/ARiWMRnrYTg?t=34
http://youtu.be/j5fno9JdZaA?t=3
http://youtu.be/nM_Tt2hjbj0?t=32 TimingFailure Example
http://youtu.be/nM_Tt2hjbj0?t=358 TimingFailure Example Rattle
http://youtu.be/bRQiFIPTric?t=141 TimingFailure Example Rattle
http://youtu.be/92e5Qh42ULI?t=93 TimingFailure Example Rattle
http://www.therangerstation.com/forums/index.php?threads/no-compression-in-4-0-sohc.191436 TimingFailure Example BentValves
http://youtu.be/MHHzXUtmErg?t=1
http://youtu.be/92e5Qh42ULI?t=61
http://youtu.be/WJax1KPtRB8?t=17
http://youtu.be/u3WyE4nOmHs?t=1
http://youtu.be/GX1oMHwm1JQ?t=1
http://youtu.be/xKTZMl35-hw?t=1
http://youtu.be/eCKOHVdv98c?t=1
http://youtu.be/P_mjp5yQFfo?t=13
http://youtu.be/HVROVcmLpQU?t=1
http://youtu.be/C3EIC2g2nkI?t=13
http://youtu.be/oh-RueWyX_Y?t=1
http://youtu.be/P_mjp5yQFfo?t=1
http://youtu.be/-5mI-ah4qRQ?t=1
http://youtu.be/DfVPrSAd3Og?t=1
http://youtu.be/9_3inbJoYyA?t=1
http://youtu.be/P4N5E_RfYpE?t=1
http://youtu.be/NZfbu_RX_Xs?t=1
http://youtu.be/PAv6oCDXAV0?t=1
http://youtu.be/q_hzBq11HWQ?t=1
http://youtu.be/LB1UNBeaWJQ?t=15
http://youtu.be/LVnG10Rpi4M?t=54
http://youtu.be/6_u6Me2WooA?t=1
http://youtu.be/LyGQsHZEpXM?t=1
http://youtu.be/52_ehMNpDps?t=1
http://youtu.be/b2NvDAShANE?t=136
http://youtu.be/YSxAxQFZ0AA?t=1
http://youtu.be/wMQx-RRF0Wk?t=1
http://youtu.be/_PpVvGpO0tg?t=1
http://youtu.be/xAEA4y8bnIA?t=14
http://youtu.be/gnHB1VA6C2M?t=12 TimingCassette Rght Hack!
http://youtu.be/LyGQsHZEpXM?t=0 TimingBalancer Shaft
http://youtu.be/52_ehMNpDps?t=0 TimingBalancer Shaft
http://youtu.be/pwUmIDTX0gs?t=9 Engine UnStall
http://youtu.be/Da7SK6uCE8Y?t=3 Engine InStall
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