| Manifold crack [message #204269] |
Wed, 10 April 2013 11:40  |
An87ttype
Messages: 157
Registered: September 2012
Karma: 0
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I took the carb off today to clean a sticky float. I looked for the crack that everyone speaks about and sure enough, there is a crack between the secondaries. It is a hairline crack that goes from top to bottom.
What else should I look for to see if this is a problem? It ran well except for the flooding problem. Looks like the PO did not put the spring in the filter so it was just rattling around not filtering anything.
Thanks all for all the help...
1975 Eleganza II
Hudson Valley NY
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| Re: [GMCnet] Manifold crack [message #204279 is a reply to message #204269] |
Wed, 10 April 2013 12:37  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Daryn,
The vertical cracks between the throats are nothing to worry about. It's
those in the bottom, leading into the camshaft valley that you have to
worry about.
Ken H.
On Wed, Apr 10, 2013 at 12:40 PM, Daryn wrote:
>
>
> I took the carb off today to clean a sticky float. I looked for the crack
> that everyone speaks about and sure enough, there is a crack between the
> secondaries. It is a hairline crack that goes from top to bottom.
> What else should I look for to see if this is a problem? It ran well
> except for the flooding problem. Looks like the PO did not put the spring
> in the filter so it was just rattling around not filtering anything.
> Thanks all for all the help...
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Manifold crack [message #204309 is a reply to message #204306] |
Wed, 10 April 2013 18:54 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Jerrod,
I don't know. But I THINK those cracks are basically independent of the
bad floor cracks. They're both doubtless due to the big exhaust crossover,
but I think the bottom cracks occur whether or not there are throat cracks.
But others here have more experience with them than I do.
Ken H.
On Wed, Apr 10, 2013 at 6:55 PM, jerrod winter wrote:
>
>
> can the end of the crack be drilled to prevent it from going any further?
> Otherwise isn't it going to eventually go all the way through?
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Manifold crack [message #204320 is a reply to message #204309] |
Wed, 10 April 2013 20:33 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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I have several 455 cast iron manifolds that are cracked. The valley side of
the manifolds are all extensively cobweb cracked before cracks appear in
the floor of the inlet tract. I would hazard a guess that if the floor of
the intake passages is cracked, that the valley is leaking.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Apr 10, 2013 4:55 PM, "Ken Henderson" <hend4800@bellsouth.net> wrote:
> Jerrod,
>
> I don't know. But I THINK those cracks are basically independent of the
> bad floor cracks. They're both doubtless due to the big exhaust crossover,
> but I think the bottom cracks occur whether or not there are throat cracks.
> But others here have more experience with them than I do.
>
> Ken H.
>
>
> On Wed, Apr 10, 2013 at 6:55 PM, jerrod winter wrote:
>
> >
> >
> > can the end of the crack be drilled to prevent it from going any further?
> > Otherwise isn't it going to eventually go all the way through?
> >
> >
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| Re: Manifold crack [message #204321 is a reply to message #204269] |
Wed, 10 April 2013 20:35 |
An87ttype
Messages: 157
Registered: September 2012
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Thanks guys, I also wonder if there is a way to stop it from getting worse. I guess the only way is to block the crossover.
Thanks again...
1975 Eleganza II
Hudson Valley NY
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| Re: Manifold crack [message #204326 is a reply to message #204321] |
Thu, 11 April 2013 00:45 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Blocking the cross over is only a 3 or 4 hour job and should be done whether or not the floor is cracked. If the floor is cracked then filling the manifold crossover or replacement is the only answer along with blocking the crossover.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Manifold crack [message #204372 is a reply to message #204269] |
Thu, 11 April 2013 14:05 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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Has anyone been brave enough to try that Hardblock filler for the manifold crossover?
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: Manifold crack [message #204395 is a reply to message #204372] |
Thu, 11 April 2013 17:23 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| GeorgeRud wrote on Thu, 11 April 2013 14:05 |
Has anyone been brave enough to try that Hardblock filler for the manifold crossover?
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Rob Mueller is suppose to be doing it soon.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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