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10-20-2013, 10:47 PM
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#1 |
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Senior Member
 Join Date: Jan 2001
Location: Northern Illinois
Posts: 516
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Manifold Leak
I have an Edelbrock 2101 aluminum manifold on a 350 engine. There is a coolant leak in the port on the driver's side front. It has a 3/8" NPT thread. I don't use that port and need to cap it off but it leaks at the pipe plug. I have tried sealing compound, but I think that the thread is not in the greatest shape. I was wondering if anyone else had this problem and knew of a fix. Any advice would be appreciated.
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Bernie |
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10-20-2013, 11:20 PM
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#2 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Manifold Leak
I have seen J-B Weld used as a sealant in extreme emergency situations.
OK I did it ONCE on my mom's Olds....but JUST ONCE. It lasted over 3 years until someone stole the car. The olny reason that it was done was 260 Olds parts were pricey at the time. It did work.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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10-20-2013, 11:46 PM
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#3 |
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Senior Member
Join Date: Jan 2001
Location: Northern Illinois
Posts: 516
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Re: Manifold Leak
I thought about that but, I really don't like the idea. McMaster Carr sells a "test pipe plug" which fits into a pipe end and then expands with a neoprene seal. I would be unhappy to replace the manifold because of one partially stripped thread, but doubt my ability to drill out the hole and tap it for a larger plug.
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Bernie |
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10-21-2013, 09:43 AM
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#4 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,147
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Re: Manifold Leak
I would drain a little coolest out, clean the threads of the plug & manifold very well with some lacquer thinner or alcohol. Install the plug with some silicon gasket maker and let set for at least 24 hours before refilling. A local machine shop could drill and tap that out to 1/2" in no time, probably for less than $50.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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10-21-2013, 12:07 PM
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#5 |
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Senior Member
Join Date: Jan 2001
Location: Northern Illinois
Posts: 516
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Re: Manifold Leak
Thanks for the replies. I will try the RTV gasket maker. Maybe the answer is to have steel thread inserts put in. It's difficult to keep the distributor in place because I don't want to strip the threads where the clamp hold down goes.
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Bernie |
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10-21-2013, 07:51 PM
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#6 |
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Senior Member
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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Re: Manifold Leak
try the Indian Head gasket sealer from permatex on the threads, it is in a little brown bottle, i use that stuff for everything, including steam flanges on naval ships,
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Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks 
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