# Best Silicone or JB Weld for Engine **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** integra, acura\ **Created:** [August 9, 2009, 7:13pm UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778 "2009-08-09T19:13:27Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![sciconf](https://avatars.discourse-cdn.com/v4/letter/s/919ad9/32.png) [@sciconf](https://community.cartalk.com/u/sciconf)\ **Post date:** [August 9, 2009, 7:13pm UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/1 "2009-08-09T19:13:27Z")
1987 Integra, 146k There is a tiny valve, 1 mm diameter, related to bleeding coolant - coolant is leaking there. Its in the corner of the Engine, so it can get hot. A friend said get a Silicone to seal it off - called Kragen - they said not Silicone, but JB Weld. Any recommendations? ---
**Author:** ![sciconf](https://avatars.discourse-cdn.com/v4/letter/s/919ad9/32.png) [@sciconf](https://community.cartalk.com/u/sciconf)\ **Post date:** [August 9, 2009, 7:19pm UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/2 "2009-08-09T19:19:40Z")
Also what temp engine block gets to ? ---
**Author:** ![hd72mm](https://avatars.discourse-cdn.com/v4/letter/h/9fc29f/32.png) [@hd72mm](https://community.cartalk.com/u/hd72mm)\ **Post date:** [August 9, 2009, 7:52pm UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/3 "2009-08-09T19:52:57Z")
Maybe 2 hot for jb weld The trick for any sealer is to make sure you give it PLENTY of time to set up. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [August 9, 2009, 8:15pm UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/4 "2009-08-09T20:15:04Z")
JB-Weld will work if you do it right…Surfaces must be spotless, allow 48 hours undisturbed to cure. Just when you think it’s clean enough, clean it again with MEK or acetone… ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [August 9, 2009, 11:15pm UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/5 "2009-08-09T23:15:38Z")
JB Weld can be used up to 500F. Some (not all) silicones can be used up to 600F, though 450F to 500F is more usual. Some high temperature silicones need higher temperature to cure, too. ---
**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\ **Post date:** [August 10, 2009, 1:28am UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/6 "2009-08-10T01:28:50Z")
Fixing the problem right is not a option? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [August 10, 2009, 2:27am UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/7 "2009-08-10T02:27:37Z")
This is the coolant system bleed valve so air can be removed from the cooling system. It just might be this bleed valve is defective, And a replacement with a little pipe joint tape/compound will fix the problem. Instead of doing the Mickey Mouse fix? Tester ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [August 10, 2009, 2:54am UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/8 "2009-08-10T02:54:10Z")
My recommendation is fix it right and forget the goop 'em. Weigh the price of JB Weld against the cost of a lost engine. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [August 10, 2009, 4:44am UTC](https://community.cartalk.com/t/best-silicone-or-jb-weld-for-engine/34778/9 "2009-08-10T04:44:00Z")
If it’s corroded and replacement is impossible, drill it out and tap it to 1/8" pipe threads and put a brass plug in the fine hole you just made…In an aluminum head, this should be quite simple.