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Old 03-10-2005, 09:03 PM
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Farmer Ted Farmer Ted is offline
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Exhaust manifold

what are the holes on the side of the exhaust manifold for?

Are they freeze plugs?

They have what looks like a quarter sized disc in them?

What happens if one of these discs falls out? How do you reinstall it? Can it be reinstalled?
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Old 03-10-2005, 09:17 PM
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Farmer,
Was this a trick question? It reminds me of the movie Risky Business where Rebecca tells Tom, “Yes, No…Maybe. But, if it had been you asking her this question I am sure she would have said, “Yes, yes…yes.”
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Old 03-10-2005, 09:20 PM
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Farmer Ted Farmer Ted is offline
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Quote:
Originally Posted by Professor
Farmer,
Was this a trick question? It reminds me of the movie Risky Business where Rebecca tells Tom, “Yes, No…Maybe. But, if it had been you asking her this question I am sure she would have said, “Yes, yes…yes.”
Just curious, the 98 is securly parked on the beach FMC (fully mission capable) just waiting on the WX to cooperate
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Old 03-10-2005, 09:24 PM
Lance Lance is offline
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Just for the record I don't believe they are 'freeze plugs' but instead are 'casting plugs'. The holes in the casting are put there as a necessary part of the engine casting process and is the location where the sand from the sand casting is flushed out. They do often in fact save people from and expensive engine replacement because they will blow out in some cases when water freezes but that is not their intended purpose I don't think.

If you do a google on "freeze plug sand casting" you will find several references to this. There are probably some engineers on the board that have spent some time in a foundry (at least in school) that can describe the process.

So I think the answers are:

1: The holes are to let the sand out after the manifolds are cast in the foundry,

2: No they are not freeze plugs,

3: Probably just get new plugs and bang them in with a hammer.
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  #5  
Old 03-10-2005, 09:28 PM
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Farmer Ted Farmer Ted is offline
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Quote:
Originally Posted by Lance
Just for the record I don't believe they are 'freeze plugs' but instead are 'casting plugs'. The holes in the casting are put there as a necessary part of the engine casting process and is the location where the sand from the sand casting is flushed out. They do often in fact save people from and expensive engine replacement because they will blow out in some cases when water freezes but that is not their intended purpose I don't think.

If you do a google on "freeze plug sand casting" you will find several references to this. There are probably some engineers on the board that have spent some time in a foundry (at least in school) that can describe the process.

So I think the answers are:

1: The holes are to let the sand out after the manifolds are cast in the foundry,

2: No they are not freeze plugs,

3: Probably just get new plugs and bang them in with a hammer.

Thank you sir!
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Old 03-10-2005, 09:34 PM
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Yeah, don’t know why I couldn’t remember
Lance’s answer is much better, but Farmer…can’t you just hear Rebecca telling you that right now???
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Last edited by Professor; 03-11-2005 at 07:03 PM.
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  #7  
Old 10-19-2005, 04:42 PM
dchatagnon dchatagnon is offline
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I have removed my exhaust manifold and I want to clean the inside before to repaint them and put it back.
What do you suggest?

thanks.
Damien
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Old 10-19-2005, 04:48 PM
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PointTaken PointTaken is offline
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Quote:
Originally Posted by Lance
Just for the record I don't believe they are 'freeze plugs' but instead are 'casting plugs'. The holes in the casting are put there as a necessary part of the engine casting process and is the location where the sand from the sand casting is flushed out. They do often in fact save people from and expensive engine replacement because they will blow out in some cases when water freezes but that is not their intended purpose I don't think.

If you do a google on "freeze plug sand casting" you will find several references to this. There are probably some engineers on the board that have spent some time in a foundry (at least in school) that can describe the process.

So I think the answers are:

1: The holes are to let the sand out after the manifolds are cast in the foundry,

2: No they are not freeze plugs,

3: Probably just get new plugs and bang them in with a hammer.
Lance, that was a very informative answer. I was always told they were freeze plugs also.
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  #9  
Old 10-19-2005, 05:01 PM
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Andyg Andyg is offline
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Quote:
Originally Posted by Lance
Just for the record I don't believe they are 'freeze plugs' but instead are 'casting plugs'. The holes in the casting are put there as a necessary part of the engine casting process and is the location where the sand from the sand casting is flushed out. They do often in fact save people from and expensive engine replacement because they will blow out in some cases when water freezes but that is not their intended purpose I don't think.

If you do a google on "freeze plug sand casting" you will find several references to this. There are probably some engineers on the board that have spent some time in a foundry (at least in school) that can describe the process.

So I think the answers are:

1: The holes are to let the sand out after the manifolds are cast in the foundry,

2: No they are not freeze plugs,

3: Probably just get new plugs and bang them in with a hammer.
You got half of it. The plugs are where the supports are for supporting the sand cores during the casting process. It is hard to suspend a core in the middle of the die, gravity is funny that way. The secondary benefit is it helps with removal of the sand after casting.
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  #10  
Old 10-19-2005, 05:40 PM
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Quote:
Originally Posted by dchatagnon
I have removed my exhaust manifold and I want to clean the inside before to repaint them and put it back.
What do you suggest?

thanks.
Damien

I just had my aluminum ETX manifolds plastic bead blasted to remove all the paint. If you are talking about removing the paint/rust from cast iron manifolds so you can repaint them I would use a glass bead blast or aluminum oxide blast. Make sure you protect the threads and gasket surfaces though. If you are talking about trying to remove carbon and rust from the inside I wouldn't waist my time.

Andyg
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