Posted by Janicholson on August 21, 2011 at 08:47:35 from (199.17.6.66):
In Reply to: Re: manifold problems posted by JR FRYE on August 21, 2011 at 07:36:31:
Nope, the stress on the pipe is heavy enough to wiggle it loose. If you clean it up with an abrasive disk on a 4" hand held grinder, it can be tapped as I indicated earlier. If you are careful, it will even look good. The threads rust between the pipe and the cast iron of the manifold. as they deteriorate, the strength goes away. One of the most prevalent and destructive factors is that water flows down the exhaust pipe i=on the outside and enters the engine through the bad fit of pipe to manifold. Because the tap cost so much, it is often passed by, and some coupling is welded on. (usually with 6011 plain steel rod. That can never work.) The tapered pipe threads are easily tapped deeper into the manifold. If you can t clean it up enough to tap, having a Nirod welded coupling put on it professionally, allows the visible part of the pipe to be replaced as needed. Been there many times, Jim
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