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Join Date: Apr 2009
Location: Copperas Cove, TX
Posts: 211
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Can I.....
mix up some more epoxy and apply it around the suspect area on my pop off valve without having to remove the pop-off valve anymore? I still have a vacuum leak even though I have mounted the valve flush to the air-box. It took me two attempts to finally get it right (or so I thought) after breaking the seal and re-gluing twice. Since it is mounted flush I am a bit hesitant of prying it up again. Has anyone ever just mixed up epoxy and reapplied it in this matter or should I just pry it up, re-sand the area, and try it again? My problem seems to be that I can't get a good bead around the valve because you have to mix the epoxy and then smear it on with a putty knife. Is there an epoxy out there that comes pre-mixed in a tube that can just be applied like toothpaste? TIA.
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) |
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03-01-2010, 08:10 AM
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You want to use JB weld. Yes you can put a fillet of epoxy around the puv.
Some epoxy's come in a syringe and mix when dispensing JB weld does not.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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03-01-2010, 08:15 AM
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Location: Portland, Oregon
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The last time I did this, I used the regular (24 hour curing) JB Weld. One thing I noticed is that as it slowly cured, it also flowed to made a nice smooth seal.
I would suggest you get some of the regular JB Weld, spread it as best you can and let time and gravity do the rest.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
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03-01-2010, 09:28 AM
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Quote:
Quote:
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) |
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03-01-2010, 09:49 AM
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I would think you have nothing to lose by trying but a bit of time.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
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03-01-2010, 10:08 AM
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1980 911 SC
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I used a small mechanics mirror to get a good look at the back side of the valve. Its a hard to reach/see area and in my case it is where the leak was.
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Life's a Beach |
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03-01-2010, 10:16 AM
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grateful user
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Ive been using black urethane. Ive had several epoxied ones come loose. Heat and vibration will make epoxy eventually crack. With the urethane, it seals better than anything and drys pliable, and the valve will never come out. Also, clean up of the old epoxy is'nt so critical.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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03-01-2010, 10:24 AM
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Join Date: Oct 2008
Location: Nash County, NC.
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Just pry up on the pop off valve and it will come right off. The epoxy holds it in place but does not bond to the plastics.
Just clean the valve up with a knife and sand paper and replace. Bruce |
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03-01-2010, 10:25 AM
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daily driven 911
Join Date: Feb 2009
Location: austin texas
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i havent been on here in a while, but i did think of you when i read this.... good show this weekend jon ( red 82 SC) |
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03-01-2010, 12:02 PM
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Quote:
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) |
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03-01-2010, 12:08 PM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
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I would definitely try to rough up the area around the valve with sandpaper, emory cloth or whatever will be most effective in the limited amount of space you will have. This will help to better adhere the epoxy to the surface.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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03-01-2010, 12:20 PM
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I did notice that there is suction on the lid of the pop-off valve whenever the engine is idling which prevents you from easily pulling the lid up. My thought is after i clean the area up a little i can apply some more epoxy while the engine is running and the suction will help direct the epoxy down into the creavices that a putty knife skips over....what are your thoughts on this?
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) Last edited by Jtilden; 03-01-2010 at 12:38 PM.. Reason: misspelled word |
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03-01-2010, 12:33 PM
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grateful user
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I have bad thoughts. If i where you, i would pull it out clean it as best you can, go to auto zone and buy a 15.00 tube of urathane, and be done with it forever. I have epoxied alot of these in, and doing very good prep work, but they will still sometime come loose, and when it comes loose your not going anywhere. Urathane will NEVER come loose. It good peace of mind if you have ever had one come loose on the freeway.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. Last edited by don gilbert; 03-01-2010 at 01:27 PM.. |
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03-01-2010, 01:22 PM
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Quote:
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) Last edited by Jtilden; 03-03-2010 at 06:02 PM.. |
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03-01-2010, 04:25 PM
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WOW!....installed the new pop-off valve using the urethane sealant...now she purrs like a kitten...Pelican has come to the rescue once again...thanks Don Gilbert...you da man!
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) |
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03-03-2010, 04:04 PM
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grateful user
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glad its fixed permanently now.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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03-03-2010, 05:57 PM
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Registered
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Location: Copperas Cove, TX
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Quote:
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95 993 Cab 99 996 C2 80 911SC Targa 85 944 N/A(sold) |
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03-03-2010, 06:04 PM
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grateful user
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My brother is also my body man. His idea a couple years ago.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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03-04-2010, 03:57 AM
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1974 Porsche 911 targa 2.7
911SC
75 Porsche 911
bike
1970 porsche E
