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Old 09-30-2004, 09:08 PM   #1
stimpy
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Default Rubber gasket for lower radiator cap

I have an STi engine in my car and an L radiator going. I've clipped the spring and lower seal on the radiator cap but it cannot hold the pressure and leaks. I've wandered around Lowes and Home Depot looking for a rubber sheet. The problem is that nobody at the stores knows what I'm talking about or where to find it. Anybody know, specifically, where I can find some 1/16" rubber of some sort to make a gasket?

-Jon
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Old 09-30-2004, 09:19 PM   #2
Jaxx
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go buy a new radiator cap for ~$5 dollars
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Old 10-01-2004, 03:14 PM   #3
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Bought another cap and hacked it. I used the gasket fromthe old cap inserted into the new cap. Working great so far. I'm going to try and order a 2003+ WRX radiator fill cap but it'll take awhile to get here.

If this solution is no good, a friend suggested a stamp and sign company that sold sheets of rubber. I didn't investigate any further than that since my second cap gasket is working out.

-Jon
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Old 10-03-2004, 02:18 AM   #4
garface
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That's my pic. It's in the plumbing section, wouldn't the part number help them find it? I have some extra here...
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Old 10-05-2004, 12:25 AM   #5
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Stimpy,
won't the '03 cap be the same? when I looked at the RS and WRX caps they were basically the same. Did something change on the '03 cap?

-Noah
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Old 10-05-2004, 05:22 PM   #6
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I believe any radiator caps you can buy at the autoparts stores are just the standard radiator caps. The "fill cap" is what I wil be ordering from Subaru.

-Jon
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Old 10-05-2004, 11:41 PM   #7
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i see. i'll have to check that out and see how that works.

-noah
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Old 10-06-2004, 10:35 AM   #8
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OMG ME TOO! ITS DRIVING ME NUTS!! when i drive hard sometimes i will smell coolant, and pop my hood and see little trickles of coolant near that lower cap where i removed the spring plunger. I dont know what to do
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Old 10-06-2004, 10:40 AM   #9
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Why did you guys remove the plunger? I was always told to leave it unless you started having overheating issues. I never did and drove the car like that for many miles, and it was always fine.
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Old 10-06-2004, 11:18 AM   #10
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Quote:
Originally Posted by ImprezaRSfan!
OMG ME TOO! ITS DRIVING ME NUTS!! when i drive hard sometimes i will smell coolant, and pop my hood and see little trickles of coolant near that lower cap where i removed the spring plunger. I dont know what to do
Luis, we took it off just to make it an open sytem the way the WRX's and STi's have them.

RSfan, just get a peice of rubber like in my pic above, or here: http://gallery17817.fotopic.net/c44643_1.html, page 2 I think, and cut it into a little donut. It's thick enough that with one donut it'll be really tough to tighten the cap. My cap was spewing coolant out at idle and now it's dry as a daisy even after beating the crap out of the car. I even have an extra cap under my seat with a donut already on it just in case it ever gives out. I've had it on for about 15 months with no problems. I should probably take it off to see if it's cracking or falling apart at all.
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Old 10-06-2004, 11:23 AM   #11
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Mike i know why, i just don't understand why you'd do it if your not having problems. It seems there are quite a few people that have to deal with this. You got your solved pretty quick, but with all the other crap to deal with....i don't know, just trying to get a feel for if people just did this right away or were overheating and did it. Anybody else leave their's alone?
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Old 10-06-2004, 11:27 AM   #12
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Heh, I figured you knew. Maybe if you keep the plunger part then coolant won't always get up to the header tank and do the trickle down into the turbo thing to cool it after you shut down. Could be wrong, but just a thought.
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Old 10-06-2004, 12:59 PM   #13
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Quote:
Originally Posted by Soon2Bgreat
Mike i know why, i just don't understand why you'd do it if your not having problems. It seems there are quite a few people that have to deal with this. You got your solved pretty quick, but with all the other crap to deal with....i don't know, just trying to get a feel for if people just did this right away or were overheating and did it. Anybody else leave their's alone?

your supposed to do it. So coolant can flow from the radiator to the wrx/sti metal reservoir, then to the radiator plastic bottle overflow. If u keep the spring/plunger or a normal radiator cap on there, it wont get to the wrx/sti metal reservoir unless its over lots of pressure becuase it has to push up on the spring to get to the hole to flow there.
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Old 10-06-2004, 02:27 PM   #14
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I know why...like i said i just didn't understand why people do it off the bat. Will it overheat if not done? Have people had issues with it? The reason i ask is because i never did mine and it worked flawlessly. Never had an overheating issue, coolant spilling etc. I was just thinking if it could save trouble of people spewing coolant and worrying about it, maybe they should leave the plunger alone until an issue comes up. If it ain't broke, don't fix it.

There may be other issues like garface. mentioned about coolant not circulating through the turbo upon shutdown. I'm not sure what to think of that. It could be. From what i've seen though i'd be inclined to say it does. Could be wrong though.
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Old 10-06-2004, 02:52 PM   #15
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yeah, go to the plumbing section. If they don't have the rubber sheet seperately, they will have a pipe leak repair kit which is basically a small sheet of rubber and a big clamp. The real use is when you have a split in a water pipe in your house. You wrap the sheet over the crack, put the clamp around it and tighten it down to temporarily stop the leak.

For example;
http://www.lowes.com/lkn?action=prod...21-143-PP24001
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Old 10-12-2004, 01:53 PM   #16
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i just bought a radiator cap from the 1993 RX7 it only has 1 sealin it(the upper one) it doesnt have the lower seal with the spring in it...

(its the one for the RX thats on the motor by the water pump)
KF01-15-205 Cap,Radiat

Last edited by YaZahX; 12-23-2004 at 01:40 AM.
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Old 10-14-2004, 12:54 AM   #17
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where did you buy the cap from, and how much was it? it sounds like this cap could work really well for this purpose. do you know what pressure it will hold?

i did look at the fill cap on the STi and Legacy GT and they both have the lower seal so i don't think that they will work any better for the purpose we are trying to use it for. although it will hold more pressure.

noah
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Old 08-05-2005, 09:36 AM   #18
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Stimpy,

Here's an interesting thread on the 03+ WRX caps. They are still pressurized caps apparently.

Ordered the RX7 cap that is a 13psi cap.

03+ Radiator Cap

??
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Old 08-05-2005, 10:50 AM   #19
Jaxx
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my upper cap rubber devloped rot and started to leak when cold i replaced mine yesterday with a .9 bar cap for $7.14 at schucks right next to it were the 1.1 and 1.3 (same price)
my lower one is fine no plunger no leak

the 1.1 or 1.3 bar caps scares me .. no need to have exploded radiator . the 1.8 raidator+stock thermostat has never had ANY issues cooling my car
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Old 08-05-2005, 11:57 AM   #20
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I cut out the center of mine, and used a thick ass rubber gasket out of an older radiator cap that my friend had around his shop, it's kinda hard to get it on but no leaks once it's on. Wish I woulda paid more attention to what it was now

I had leaking issues before I had that with some other crap I could find

-Tim
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Old 08-05-2005, 01:16 PM   #21
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wow. a EJ18 radiator will handle a EJ20. tahts cool to know. i wonder how much diff the OEM ej20g radiator makes
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Old 08-05-2005, 01:23 PM   #22
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well the coolan tank that sits on the passenger side intake manifold is a 108kpa one or 1.1 bar(15.7psi). So by using the 13psi one in the radiator shouldn't be a problem right since it will require only 13psi to push up on the spring and allow coolant to pass through.
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Old 08-05-2005, 06:50 PM   #23
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Default Do you thionk this will work?

I wonder if this will work. I just removed the lower seal on it. Or should I just go ahead and use the RX7 one?

Pic 51 in the album

There has to be a valid solution to this. The Round cap on the 03+ WRXs have a pressure rating of 108kPa.
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Old 09-19-2009, 03:42 PM   #24
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Bringing this back from the dead because it's the only thread I can find thats asking my question.

Do I need to modify my Radiator cap on my L model radiator or not ? Im finishing a EJ20G swap and I am still unsure about this.
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Old 09-19-2009, 05:31 PM   #25
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did you get a turbo radiator with your engine .. if not yes you do
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