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#4441333 - 06/25/17 05:51 PM Radiator Stop Leak Recommendation
Egg_Head Offline

Registered: 10/07/12
Posts: 256
Loc: North Carolina
My 1979 Jeep CJ-7 w/304 V-8 appears to have a slight coolant leak at the seam towards the bottom, 10 drips on the garage floor after 1 week of not driving. Radiator is the original Blackstone and I believe it is brass. Jeep has 38k original miles and I am driving it to the beach next Friday, trip is about 4 hours. I am willing to roll the bones and try some stop leak, any recommendations? Bars has about 4 different products for this, thanks.
1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)

#4441342 - 06/25/17 05:57 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
old1 Offline

Registered: 01/04/11
Posts: 935
Loc: Columbus Nebraska
Although probably most people will say don't use any, just fix it, If you are going to use a stop leak, I would use the Bars leaks pellets or powder, or the pelletized stuff. I think it is all mostly the same ingredient. Just don't use the aluminized stuff. I personally have used all that I mentioned, and found it to work pretty good and cause no problems.
2014 Fusion 2.5 engine 5/20 QSUD
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil

#4441344 - 06/25/17 05:58 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
andyd Offline

Registered: 09/25/04
Posts: 6732
Loc: Marshfield , MA
Use the pellets not the aluminum powder
'16 Camry LE STP synth 0w20 and STP filter.

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline bulk 0w20 and ? filter

#4441347 - 06/25/17 06:04 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
FlyNavyP3 Offline

Registered: 07/04/16
Posts: 1290
Loc: Jacksonville, FL
Bars leak pellets or tablets have worked for me on many occasions. I've also had excellent luck with the GM radiator pellets from the parts counter.
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

#4441351 - 06/25/17 06:06 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Superflop Offline

Registered: 07/01/09
Posts: 369
Loc: Seattle
Yeah the gm/ac delco stop leak tablets
2002 saab 9-5 2.3t wagon
2014 dodge grand caravan magnatec 5w-20

#4441353 - 06/25/17 06:07 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
user52165 Offline

Registered: 10/21/11
Posts: 1295
Loc: CA
Free rental of pressure tester from AZ. Find out exactly where the leak is. A good handyman could solder it if brass. Those band aids you propose do more harm than good. Been there done that.

Edited by user52165 (06/25/17 06:08 PM)

#4441357 - 06/25/17 06:11 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
3800Series Offline

Registered: 08/02/14
Posts: 1450
Loc: Gulf Coast, MS
K-Seal perhaps? I know some people who has had success with it and it's not one of those types of sealers that just harden at the top of the radiator. I've used there product once when I was going up to Iowa recently. Car hit a deep pot hole out of no where and the water pump was pouring water very quickly.

We where about half way and I tried it since I heard some good stuff about it in the past. Sure enough it solved the problem in about 35-45 mins and the thing stopped leaking and got me to Iowa where I was able to replace the pump and gasket correctly.

I read a lot about it at the time and it's suppose to be mainly a chopper, fiberglass??, and epoxy mix that cure on contact with air instead of just melting when it's hot and gets clogged in the leak over time.

I guess the best thing about it is it can be kept in the system and is safe for the heater core since it only cures after prolonged contact with air and doesn't require the system to be flushed out afterwards.

#4441372 - 06/25/17 06:29 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Bud_One Offline

Registered: 04/19/14
Posts: 1771
Loc: Spring,Texas
+1 for the pellets , they've fixed a couple of vehicles of mine in the past that had slight coolant leaks.
16 Civic-M1 EP 0W-20, TG7317
14 Civic-M1 EP 0W-20, XG7317
05 Chevy 2500HD-QSUD 10W-30, XG3675
97 Accord Wagon-Havoline Conv 5W-30, PH3593A

#4441380 - 06/25/17 06:39 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Donald Offline

Registered: 03/21/04
Posts: 20116
Loc: Upstate NY
A brass radiator can be fixed by a radiator repair shop (if they still exist).
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)

#4441381 - 06/25/17 06:41 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
901Memphis Offline

Registered: 08/14/10
Posts: 12834
Loc: Northern Kentucky
Yup should be a good candidate for an actual repair
2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

#4441383 - 06/25/17 06:47 PM Re: Radiator Stop Leak Recommendation [Re: Donald]
Egg_Head Offline

Registered: 10/07/12
Posts: 256
Loc: North Carolina
Getting the OE radiator repaired is my ultimate goal. There is a great family owned, old school radiator repair shop in my town. I'm traveling this week and will not have time to get that taken care of prior to the road trip. I have AAA 100 mile tow service if the stuff hits the fan, part of the adventure.
1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)

#4441412 - 06/25/17 07:12 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
slacktide_bitog Offline

Registered: 03/20/08
Posts: 5607
Loc: USA
aluma-seal is good stuff, available as both a liquid and as a powder thumbsup

#4441433 - 06/25/17 07:47 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
GMBoy Offline

Registered: 11/22/04
Posts: 7663
Loc: Texas
Great Jeep! I have a similar one but a 1978.

#4441440 - 06/25/17 07:58 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Trav Offline

Registered: 11/20/06
Posts: 17755
Loc: MA,
Bars Leak or GM tabs or Subaru sealer only no metallic sealers. The metallic ones will plug an older system up quicker than you can think about it.
The products mentioned use ginger root as the main ingredient, it shrinks when when and only expends wet in the presence of air so it basically just roams around waiting for a leak without doing any damage, OE manufacturers use this formula in some of their problematic engines.

The GM and Subaru ones are available from any dealer, for a V8 GM makes a larger packet and 2 bottles of the Subaru stuff.
ASE L1, Master. Deutsch Meisterbrief.

#4441447 - 06/25/17 08:13 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Sayjac Offline

Registered: 10/13/08
Posts: 11966
Loc: The Old North State
Edit. Trav's got it covered. Bar's Leak Stop Leak Tabs or ACDelco tabs also my recommendation.

Edited by Sayjac (06/25/17 08:23 PM)
Edit Reason: Change post to reflect a prior reply

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