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Does 16 psi radiator cap harm the engine

Discussion in 'Stock 2006 -2010 Explorers' started by alawneh, December 5, 2017.

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    1. alawneh

      alawneh Member

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      Hello everyone, as the title of this thread i wanna know if i change the 20 psi rad cap with16 psi may this affect or harm the engine or not!!!?
      Last week i changed the rad cap becouse i felt that 20 psi built alot of pressure so the large main hose very hard to sequeez and there is no 20 psi cap at the dealership.
      2010 explorer 4wd about 164k mi.
      Thanks
       
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    3. garye

      garye Member

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      I don't think so, I have been running one of over a year no problems.
      2008 4.0
       
    4. alawneh

      alawneh Member

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      Thanks alot for your great response.
       
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    5. Davidm53

      Davidm53 Active Member

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      Same here, 16 PSI cap for several years now.
       
    6. shucker1

      shucker1 Elite Explorer

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      It will lower your boiling point of the coolant slightly.

      I think for every PSI pressure you apply you raise the boiling temp by 3 Degrees?

      Therefore you have just lowered your boil over temp by 12 degrees.

      If you keep the coolant changed on a regular basis there should not be an issue.
       
    7. alawneh

      alawneh Member

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      Thank you Davidm53 and shucker1 for response. Until now i havnt any issue just releif some hoses pressure.
       
    8. alawneh

      alawneh Member

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      Dear shucker1let me understand that,which better lowering or raising the boiling point??
       
    9. shucker1

      shucker1 Elite Explorer

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      You defiantly don't want to go higher.

      The system was designed for 20 PSI.

      You run the risk of blowing things up.

      Unless you live and drive in the desert most of the time I don't see where lowering the pressure cap wold hurt.
       
    10. alawneh

      alawneh Member

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      Thanks again. So the lower pressure cap means lower boiling point and allow water to move faster from engine to the container.
       
    11. shucker1

      shucker1 Elite Explorer

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      In essence, yes.
       
    12. 08Ex

      08Ex New Member

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      I changed my cap on my 08 Ex to the 16psi cap in 2009 because of all the radiator and thermostat housing issues I've seen on the forums. I now have 98K miles on the odo and haven't had any leak issues.
       
    13. MotorCityFats13

      MotorCityFats13 Active Member

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      the 20psi/16psi swap is one of the first things people do because 20psi is too much for those cheap plastic t-stat housings and plastic radiator end caps...... on mine before and after the swap my coolant stays stable at 192F winter and 194F summer which is normal for a 192F t-stat and the cap pressure will not change it..... so you basically did what others do but without reading it on a forum thread so I will award you with intuition 50 points lol
       
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    14. alawneh

      alawneh Member

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      Thanks alot for your post, i am wondring why i didnt change it before.
       
    15. alawneh

      alawneh Member

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      Thanks for the points, it took from me alot of time and changing parts until i swap to 16 psi rad cap,so it was intuition and trail and error expirements..

      Thanks again
       
    16. michael loibl

      michael loibl Active Member

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      If one more plastic coolant part springs a leak on my “4.OH NO”, I’m going to begin a search for an even lower psi cap than my current 16
       
    17. MotorCityFats13

      MotorCityFats13 Active Member

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      I did the through bolt and nut hack on mine and it's holding up great but the 3 bolts holding it to the manifold like to loosen up and I have to keep checking them when ever my coolant starts looking low.... but it did come from a salvaged 3rd gen and they say those crush sleeves don't like being reused but....... screw those engineers
       
    18. bobditts

      bobditts Active Member

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      resurrecting an old thread, but how do I locate a 16 psi cap to fit my 4.0? Only ones that say fit are OE replacement 20 psi caps. Thanks!
       
    19. Bill MacLeod

      Bill MacLeod Active Member

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      Motorcraft RS-76 is the 16# cap. (E9SZ-8100-A)
      " RS-523 is the 20 # cap. (6L2Z-8100-AC)
       
    20. tripplec

      tripplec Active Member

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      Is it the same cap on the 4.6L Rad of an 09. Will have to check that for the summer running. Coolant was low when we got it not topped off in the rad. Its topped up but will have to recheck later to see if a leak is in play. I always go for higher than 50% concentration and that pushes the boiling point up anyway. Added straight Antifreeze when topping off and it will mix with the system bringing it to a higher %.
       
    21. Bill MacLeod

      Bill MacLeod Active Member

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      I often use rockauto as a reference source for parts "lookup". Just checked for you and RS-523 is the Motorcraft cap for a 2009 4.6 engine.
      Rad caps should be changed every couple years, they don't last too long.
      The 16# cap I have will only hold pressure at 11". The 20# cap that I have will hold pressure at 17-18#. These caps have only seen a couple years of usage.

      Tripplec, if you are going to change the coolant on your sons truck, be aware that Ford uses a long life coolant. Best to use one that is compatable with their "Gold" coolant, has a 5 year life. Also you should consider a new stat at the same time. (Motorcraft RT-1196 for a 2006 4.6)
       
    22. tripplec

      tripplec Active Member

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      Based on another thread about the coolant. I topped up with a somewhat universal type for HOAT vehicles which a lot are using. Similar colour to what is in the rad anyway. I may pick him up a new rad cap this spring as well online.
       
    23. thebrakeman

      thebrakeman Well-Known Member

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      oops, minus 5 points for misspelling "trial". :laugh:
       
    24. tripplec

      tripplec Active Member

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      My son tried to get a 16psi rad cap for his 09 Explorer. Got a price dealer parts guy said yeah. When he got their the clueless parts guy did not understand or listen to him. He was given a 20psi cap. LOL He said of course that's not what he asked for. The parts guy at ford dealer had no clue how to find it. 100km round trip no doubt. Back to square one.

      I found on listed on a Ford site but no description nor alternate is listed. Are all these rads using the same cap such they fit? The one in this thread is an aftermarket one!!

      Any narrowing this down would help. It took me almost a week to find this thread again so I am bumping it. OK

      Thx
       
    25. Davidm53

      Davidm53 Active Member

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      Bought mine aftermarket, never did check with Ford.
      Neighborhood auto parts store.
       
    26. tripplec

      tripplec Active Member

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      Oh, what brand if any. Dealer does not have a cross reference or knows what will work that I just called. Might try CARQUEST and see what they have. If RS76 is physically the same then it should be easy to find a quality after market one. Hopefully!!
       

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