Thermostat Housing - leak
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  1. #1
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    Thermostat Housing - leak

    Yesterday I spotted a drop of coolant on the bottom edge of the LH fairing panel in front of the alternator cover. Having removed the fairing panel and checked the radiator and hoses I traced the leak to the thermostat housing to engine block connection ....... not where you would expect considering where the 'drip' was showing up. The coolant runs down the back of the block and when the bike is on the side stand it finds its way onto the fairing foam and eventually out. I'm posting this for several reasons ......... not read about this happening before ........... in normal use the leak will not be visible since engine heat will evaporate the coolant before it finds its way out ............... might save somebody else some head scratching (I saw a feint line on the engine block where the evaporated coolant had left a residue.................. the Honda WS manual doesn't specify a torque for the two bolts .............. it usefully says "Torque specifications listed below are for the important fasteners. Others should be tightened to standard torque values listed above" So to record it here, the bolts have a 10mm head which says the bolt is an M6 ......... so the torque is 10Nm. There is an 'O' ring at this joint so do not be tempted to over-tighten this connection you could make matters worse. Sorry for the long paragraph, I'm having problems inserting paragraph breaks!
    Full of Hot air? Intercool yourself............ you know it makes sense

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  3. #2
    just do it
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    Re: Thermostat Housing - leak

    Cheers.
    Just dont stand there,do something, rruff rrruff
    Wot u looken at. have a go ya mug. THE BLUE 1
    My mother said I was special ,I was born that way.

  4. #3
    Resident Eh?hole.
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    Re: Thermostat Housing - leak

    So what do you consider to be the cause o the leak? Corrosion? Somehow, lack of maintenance seems unlikely, given the owner's propensity for twiddling.
    "Roadracing motorcycles makes heroin addiction look like a vague wish for something salty." - Peter S. Egan

    "200 mph, no hands. Damn, that'd be cool right before the part where you die." - A. Duthie

    ...and the best of all by the great Hunter S. Thompson - "Faster, faster, faster, until the thrill of speed overcomes the fear of death."


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  6. #4
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    Re: Thermostat Housing - leak

    Well the O ring is +13 years old, has never been disturbed (never even had to change the thermostat) so I'm putting it down to old age. The area around the thermostat housing is clean so no corrosion from the outside so when I pull the housing I will have a look from the inside.......... I need to change out the radiator and I have a new set of hoses at the ready (yes I'm still on the originals!) so I will do all the jobs in one go. I'm not expecting anything nasty on the inside either, I always change the coolant on a regular basis ....... and it always comes out looking as clean as when it went in! .................. still can't do paragraphs!
    Full of Hot air? Intercool yourself............ you know it makes sense

  7. #5

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    Re: Thermostat Housing - leak

    Samco hoses?


    Sent from my iPhone 5 using Tapatalk



    '02 Bird, Yoshi SS full system, PCIII, Corbin GunfighterLady, Givi hard bags with full lighting system, Goodridge steel lines, HIDs, Pazzo levers, Jaws front suspension + RaceTec GoldValves, fork brace, Penske adj rear, Acumen GI, Heli Bars, Hel oil lines, BattleStep rear sets, Samco red silicon rad hoses. Dyna Coils. Galfer wave rotors.

  8. #6
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    Re: Thermostat Housing - leak

    Quote Originally Posted by CanadianBird View Post
    Samco hoses?


    Sent from my iPhone 5 using Tapatalk
    ...
    Full of Hot air? Intercool yourself............ you know it makes sense

  9. #7
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    Re: Thermostat Housing - leak

    Rad change today so thermostat housing came off. The housing has quite an intricate shape for the seal as you can see on the photo - original and new O ring. The original had taken the shape and was hard so as suspected age has taken its toll. I note that the new O ring when compressed will leave very little for re-tightening so if you have a leak you will need to replace it. Edit my paragraphs have gone again so this photo is just where it lands!............IMG_0813.JPG
    Full of Hot air? Intercool yourself............ you know it makes sense

  10. #8

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    Re: Thermostat Housing - leak

    How much did you bought the o rings and where? I think it would be better if you would also change the thermostat.

  11. #9
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    Re: Thermostat Housing - leak

    I bought the O ring from my local Honda dealer - I do with all O rings after I had a correct size but non OE one leak when I replaced a sump pan and had to do the job all over again.
    Yes I replaced the thermostat at the same time.
    Full of Hot air? Intercool yourself............ you know it makes sense

  12. #10

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    Re: Thermostat Housing - leak

    Quote Originally Posted by TheDuck View Post
    Rad change today so thermostat housing came off. The housing has quite an intricate shape for the seal as you can see on the photo - original and new O ring. The original had taken the shape and was hard so as suspected age has taken its toll. I note that the new O ring when compressed will leave very little for re-tightening so if you have a leak you will need to replace it. Edit my paragraphs have gone again so this photo is just where it lands!............IMG_0813.JPG
    Is it a worthwhile replacement on a 97 if not leaking just to be on safe side considering....

    Sent from the mothership

  13. #11
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    Re: Thermostat Housing - leak

    Personally I wouldn't replace for the sake of it, obviously I would replace it if the thermostat needed replacing and on most bikes that would have happened before 80K miles! That said, at a routine coolant change it might be a sensible preventative measure if your bike has lots of miles and the O ring is still the original - the joint is not that sophisticated so any issue and it will leak and will probably be hard to find.

    I suppose the main point I would like to get over is that if you are loosing coolant and you go round all the hoses and find them tight, put a spanner on the housing bolts and find one or both can be easily tightened then don't just wind up against the O ring, replace it.
    Full of Hot air? Intercool yourself............ you know it makes sense

  14. #12

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    Re: Thermostat Housing - leak

    Quote Originally Posted by TheDuck View Post
    Personally I wouldn't replace for the sake of it, obviously I would replace it if the thermostat needed replacing and on most bikes that would have happened before 80K miles! That said, at a routine coolant change it might be a sensible preventative measure if your bike has lots of miles and the O ring is still the original - the joint is not that sophisticated so any issue and it will leak and will probably be hard to find.

    I suppose the main point I would like to get over is that if you are loosing coolant and you go round all the hoses and find them tight, put a spanner on the housing bolts and find one or both can be easily tightened then don't just wind up against the O ring, replace it.
    Sounds good. Only currently at 60k miles. Have not ridden this year yet. Will leave it alone but possibly order the o ring replacement to have on hand

    Sent from the mothership

  15. #13

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    Re: Thermostat Housing - leak

    While riding my 1998 Bird in Myrtle Beach for Bike Week, Lots of stop and go traffic. On the last day she started leaking coolant (Engine Ice). She wasn't running hot at all, and the coolant was not steaming out, just dripping out. Pulled the fairings and checked all the hoses and all was good. Couldn't find the leak. Now after reading this thread I'm thinking it might be the O-ring. Gotta check it out.

  16. #14
    just do it
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    Re: Thermostat Housing - leak

    Quote Originally Posted by terryzrx1200 View Post
    While riding my 1998 Bird in Myrtle Beach for Bike Week, Lots of stop and go traffic. On the last day she started leaking coolant (Engine Ice). She wasn't running hot at all, and the coolant was not steaming out, just dripping out. Pulled the fairings and checked all the hoses and all was good. Couldn't find the leak. Now after reading this thread I'm thinking it might be the O-ring. Gotta check it out.
    Also check the condition of your Rad Cap,sometimes they need replacing.
    Just dont stand there,do something, rruff rrruff
    Wot u looken at. have a go ya mug. THE BLUE 1
    My mother said I was special ,I was born that way.


 

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