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  • Leaking thermostat housing

    hi all. I’m baffled. I replaced the thermostat and road tested no leaks no issues all good. Until the next morning after a short trip it leaking pretty bad. Got home nipped up the bolts and it stopped leaking. After a while went for short trip and it started leaking. Removed the thermostat checked everything was ok re-installed thermostat went for decent drive - no leak. Later same day went for short trip and again started leaking.
    please help. It doesn’t leak after install or when hot (so it seems) only when cold I think.

  • #2
    Just a check list I guess:
    Youve fitted the rubber 0 ring around the thermostat properly which acts as the seal?
    Not that it would be effecting this, but make sure the jiggle valve is in the 6 o’clock position, not 12 o’clock. At 6 o’clock the engine will run at 84 deg as opposed to 88-89 deg the other way.
    Youve torqued up the nuts properly and evenly to 20nm? Do each one a little at a time to ensure they’re all even & sharing the load evenly. If they’re not done up to equal spec then the heat expension can back out one or some of the fixings which can cause a hair line leak when everything cools down and the metal joins shrink a tiny amount.
    Not much else that can go wrong with it to cause a leak that I can think of.....

    If you ever replace a water pump one day as a DIY job be absolutely meticulous when it comes to torquing all the nuts & bolts holding it on. Work middle to outside one side at a time bit by bit until they’re all equally torqued to 20nm. Can cause probs later on if one or two are overtightened compared to the rest.
    Brett1979
    Avid PP Poster!
    Last edited by Brett1979; 14-07-2019, 05:22 PM.
    2005 120 series V6 Grande, 2 inch susp lift (King/EFS combo), 32 inch MT’s, Safari Snorkel, rear diff lock, breathers, Light Force spotlights, UHF, dual batteries.

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