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| Radiator cap question - not tight enough? (Page 1/2) |
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cebix
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JUN 08, 05:11 PM
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I noticed I have a leak from my radiator cap when the engine is hot. I literally have a small puddle on the ground after the car sits for a few hours after shutdown. I have a SPECTRA PREMIUM CU828 replacement radiator if that says something. The cap seems kind of loose when installed. I have three different ones and they all do the same thing. I read in a thread before that you need to put the cap on "two clicks"(?).
http://www.fiero.nl/forum/A...120111-2-112196.html
Could this be my problem? Is just turning the cap on clockwise not enough (green line)? Should I push it down so the ears turn over the "stops" and they stay there so it seals tighter (red line)?
Many thanks.
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Notorio
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JUN 08, 05:30 PM
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Yes, you have to push down to clear the first stop and keep turning. Nice diagram by the way!
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cebix
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JUN 08, 05:38 PM
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Thanks I found it on the internet and just drew those two lines so I can't take credit for that.
So I guess my new radiator trolled me because there's no other stop after that point. Meaning if I continue to "screw on" the cap it'll just come off since there's no more lip to hold onto. And I didn't remember how the original one went on... Hope this fixes my problem, will know tomorrow when I'll drive the car. Thanks.
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Patrick
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JUN 08, 05:43 PM
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| quote | Originally posted by cebix:
...if I continue to "screw on" the cap it'll just come off since there's no more lip to hold onto.
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 That's very odd.
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cebix
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JUN 08, 05:49 PM
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| quote | Originally posted by Patrick:
That's very odd.
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If you look at the picture in my first post I guess you should see it. If the cap lip is already under the stop after the red line and you continue to turn it clockwise it'll just fall out like it was never even screwed on. I wonder if that's just a design thing of the new radiator or am I missing a piece there or I don't know...
EDIT: Found a good picture of a cap on the filler neck (not a Fiero though), maybe this makes more sense?
 [This message has been edited by cebix (edited 06-08-2020).]
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Notorio
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JUN 08, 05:49 PM
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Here's the neck on my radiator, but I don't know if it is original or not. The first stop requires the 'push down' and the second is just at the end of the cam. Are you continuing to 'push down' after stop 1? If so that might allow one to go beyond stop 2.
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cebix
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JUN 08, 05:56 PM
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| quote | Originally posted by Notorio:
Here's the neck on my radiator, but I don't know if it is original or not. The first stop requires the 'push down' and the second is just at the end of the cam. Are you continuing to 'push down' after stop 1? If so that might allow one to go beyond stop 2.
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Exactly. I didn't notice a "first stop" on my radiator or if there is one it doesn't need any pushing down of the cap. All my different caps screw one freely. So what I did was actually put the rad cap lip over the second stop on your photo. Before that the cap kind of wobbles with very little force. Maybe I have to bend my lips a little so they seal tighter?
EDIT: All right I see where I messed up. The first diagram is wrong. Here's an updated one and the blue area is the stop I meant to point out. Sorry for that. So the cap should seal before that stop?
 [This message has been edited by cebix (edited 06-08-2020).]
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Patrick
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JUN 08, 06:02 PM
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| quote | Originally posted by cebix:
I wonder if that's just a design thing of the new radiator or am I missing a piece there or I don't know...
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That is the second stop.
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cebix
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JUN 08, 06:05 PM
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| quote | Originally posted by Patrick:
That is the second stop.
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Yes, sorry for that, I edited my post above, the diagram in the first post points to the wrong stop. My rad caps go over that 2nd stop easily with some hand pressure on it. If it turns out it seals well with the lip over the second stop can I run the car that way? Or is there some bending or other risks involved?
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Patrick
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JUN 08, 06:10 PM
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| quote | Originally posted by cebix:
I have a SPECTRA PREMIUM CU828 replacement radiator if that says something.
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It's probably crap.
Where's the Stant SuperStat you said you had ordered and installed?
| quote | Originally posted by cebix:
Ordered a SuperStat 45819 again, let's see what it does. Yeah, again from Rockauto. Should be here by Friday...
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[EDIT] Ignore everything I stated in this post. It serves to remind me that I'm incapable of multitasking.  [This message has been edited by Patrick (edited 06-08-2020).]
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