Radiator cap is lifting

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Radiator cap is lifting

Triumph Trophy mailing list
Does anyone know the psi of the heaviest cap I can put on my radiator?  I am losing all my coolant to the overflow tank where it wastes on the ground before the fan even gets a chance to turn on.
 

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Re: Radiator cap is lifting

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I don't think that should be your first step. I would check operating temperature first - is it overheating? Next I would look at the possibility of a blown head gasket pressurizing the cooling system.

 Let us know how that goes.
 

 Good luck,
 Glenn
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Re: Radiator cap is lifting

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Flush the whole system out. Make sure to remove the drain bolt in the lower
water jacket. Flush all the crud out until it runs clear. Then if your
lucky she will run cooler and not blow the cap. I had a slight case of this
before flushing out my water jacket. Also incorporate water wetter type
product.

Hope this helps,

Samuel
On Jun 25, 2015 2:58 PM, "[hidden email] [TriumphTrophy]" <
[hidden email]> wrote:

>
>
> I don't think that should be your first step. I would check operating
> temperature first - is it overheating? Next I would look at the possibility
> of a blown head gasket pressurizing the cooling system.
>
> Let us know how that goes.
>
> Good luck,
> Glenn
>
>
>
>
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Re: Radiator cap is lifting

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In reply to this post by Triumph Trophy mailing list
Hi Zognorp,  Maybe the radiator cap needs to be replaced. Maybe its a blown head gasket.
 When the engine has cooled down take off the radiator cap.
 With bike on the center stand and idling look down inside the radiator hole.
 No bubbles, good, get a new radiator cap.

 Lots of bubbles is not good, maybe a blown head gasket.
 Do a compression test if you think it may be a blown head gasket.
 Let us know what you find out.
 Greg Andrews
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Re: Radiator cap is lifting

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With the radiator cap off, 'burp' the system to remove all air.
Run the bike with engine cold and radiator cap off.  You should not see air bubbles.
If you're seeing air bubbles, then try 'burping' the system again to purge all remaining air, then try again.
If you keep getting air bubbles into the cooling system, then there is a possibility of a compression leak into the water jacket.  I had this problem repeatedly on a '66 Ford Mustang whose engine I had newly rebuilt. I finally replaced the cylinder heads and the compression leak went away.  I really hope that this isn't your problem.
- Dave
 
      From: "[hidden email] [TriumphTrophy]" <[hidden email]>
 To: [hidden email]
 Sent: Monday, June 22, 2015 11:19 PM
 Subject: [TriumphTrophy] Radiator cap is lifting
   
    Does anyone know the psi of the heaviest cap I can put on my radiator?  I am losing all my coolant to the overflow tank where it wastes on the ground before the fan even gets a chance to turn on.

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Re: Radiator cap is lifting

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It turned out to be a damaged seat for the center part of the radiator cap.  In other words, I need a new radiator.  The cap was not actually lifting.  It was just not making good contact down inside the filler neck.  I cleaned up the seating area with a Dremel tool and glued in a modified flat washer for now while my replacement radiator is being shipped in.  It is presently holding well and I can finally ride.  I can't wait until it is in top shape though.  
Thanks for the help.
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Re: Radiator cap is lifting

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Condition solved!!   It was a broken ridge inside the filler neck where the center portion of the cap is supposed to seat.  I ground it down with a dremel tool and raised it back up by gluing a pre-drilled and shaped flat washer in there for a new seating area.  It seals fine now and does not overflow at all.  I have also ordered another radiator.  Thanks for all your suggestions.