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[GMCnet] Re: It was not a cracked intake- it was the carb. now what? [message #369245 is a reply to message #369244] Thu, 24 March 2022 21:00 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
There are two kinds of cast iron manifolds. Those that are cracked, and
those that haven't cracked yet. If the cracks are accessible from the
bottom, a hole can be drilled at each end of the crack, "V" ing out the
crack with a die grinder, then tig welding the crack with rod intended for
cast iron repair. Or, use the same prep and use bronze brazing rod. When
you finish, then block off the crossover with stainless steel plates
between the heads and manifold. Some have filled the crossover passage with
poured molten aluminum or other metals. I have not done either of these
methods, but I have practiced on a severely cracked manifold.
If the manifold is cracked through to the intake passages under the
carb, it is tough sledding to get effective welds in there.
Jim Hupy
Salem, Oregon

On Thu, Mar 24, 2022, 6:32 PM CJV wrote:

> Is there any way to satisfactorily repair a cracked manifold?
>
> CJ Vermeulen, Scribbler
>
>
> From: "Len Novak"
> To: "dave silva" , "gmclist"
> Sent: Thursday, March 24, 2022 6:20:48 PM
> Subject: [GMCnet] Re: It was not a cracked intake- it was the carb. now
> what?
>
> Just for grins look for a crack at the base of the carb. Been there,
> done that. Took forever to find that.
>
>
> Len Novak
>
>
>
> On 3/24/2022 4:15 PM, dave silva wrote:
>
>
> This coach had been fully rebuilt and then parked for seven years when i
> got it.
>
> This made it hard to troubleshoot. It would run OK and then bog down. So
> of course we looked at fuel lines, filters, old gas etc.
>
> Got all that sorted still no change. Chased vac leaks etc. No change.
>
> Then someone suggested a cracked intake- that fit the symptoms perfectly.
> The issue would get worse as the engine warmed up but also, the severity
> would get worse over time. So it made perfect sense that a crack would
> open more as the engine wormed and get bigger over time.
>
> I scored a good intake and commenced to changing it. And when it was all
> back together there is NO CHANGEit still does not run right.
>
> So maybe the carb? The Revcon is sitting there, has not been run in over a
> year. The original Toronado Carb has NEVER been rebuilt, but i swap it
> out and the Coach runs PERFECTLY!
>
> Ok, that was a long and winding road. Whatever is going on is happening in
> the carb ONLY.
>
>
> Here's the symptoms- engine starts pretty easily, takes off smoothly and
> accelerates into second gear and then has no more power. If I give it more
> gas is bogs down like it's gonna stall.
>
> This gets worse the longer i drive it (lately not more than a couple
> miles)
>
> This carb was freshly rebuilt for the Coop in 2013. it went 1000 miles and
> did not move again so I'm not inclined to tear in all apart, it's not like
> parts are worn or thousands of gallons of fuel have run through it.
>
> What Say the Brain Trust ?
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> --
> Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that
> work and labels you can see! Las Vegas, NV new email: B52srule@gmail.com
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
> www.bdub.net/novak/
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