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Thread: Radiator caps

  1. #11
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    Well, as originally posted I have both 140 and 200!

    I'm still presuming these numbers represent Celsius degrees, but how does that relate to pressure?

  2. #12
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    I may have answered my own question.

    140 probably means 140 kpa which is 20 psi which is 1.37 bar
    200 kpa 29 psi 1.99 bar

    So it seems every one is right!

    But, I still don't know which one I should use!

  3. #13
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    ytt105,
    personally I'd steer clear of the 200 and have a maximum of 140 as per RAVE manual. As you've probably noticed Scouse has the TOPIx manual at 100. So 200, IMO is going to be putting too much pressure in the cooling system and potentially causing additional problems.
    Gary

  4. #14
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    For what it's worth all the new caps we get are marked 140

  5. #15
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    Cap is several yrs old... 140
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)

  6. #16
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    I bought several new genuine caps from the UK as spares. They are all marked as 140.
    My toys, projects and write-ups at PaulP38a.com

  7. #17
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    Ok OK !!!

    I've put the 140 one back on, after replacing the O rings just for the hell of it.

    I'm now starting to check the fan coupling, its the only part I haven't replaced.

    My son just 'refurbished' his coupling by replacing the oil inside. He says it definitely works, but it was on a Nissan GQ (Maverick actually) so will it work on the P38.

    Trev

  8. #18
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    Feb 2012
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    Radiator caps

    Trev, are you actually overheating? Or did the cap simply let go?

    Today would have been a good test

  9. #19
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    Craig, it got hot and spewed half the coolant out the radiator cap. Thats when I found my 'spare' cap was 200, not 140 like everyone elses.

    Im getting paranoid now watching the temp monitor all the time, but all seems to be OK.

    Just a bit worried about the fan coupling, will have to keep an eye on it.

  10. #20
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    Sounds to me like you've got pressure building in the coolant system... either an air bubble or head gasket leak. Have have you had it checked for exhaust gases...?
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)

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