Manifold Bolt?
Thread Starter
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Freshman User
Joined: Jun 2010
Posts: 43
Likes: 0
From: Iowa City, IA
Manifold Bolt?
Hey all, I was driving down the highway today and all of the sudden my engine got very loud and I could hear every time one of the cylinders fired. When I got home I got a flash light out and I noticed a new hole in my exhaust manifold on the drivers side. It looks like the others have a bolt or some kind of a plug over this hole. The way the hole is on top of the manifold it can't be a bolt to hold it onto the block so I am wondering what it is for. Obviously what ever was there fell out. Is this something I can easily fix?
Here's a picture of what I am talking about:
Thanks for your help!
Derrick
Here's a picture of what I am talking about:
Thanks for your help!
Derrick
Cargo Master
Joined: Jul 2009
Posts: 2,541
Likes: 54
From: Des Moines
I believe that is where the air injection system hooked up. The PO probably disconnected the system and just had a plug or something in the hole. Do you have the smog pump/air injection system or does it look like it's been removed?
Thread Starter
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Freshman User
Joined: Jun 2010
Posts: 43
Likes: 0
From: Iowa City, IA
It looks like there is one of these holes over each exhaust port. They all have a little cap over them. Look at the one on the right of the hole.
Cargo Master
Joined: Jul 2009
Posts: 2,541
Likes: 54
From: Des Moines
What year/engine do you have? That could lead us to some answers.
No I don't mean a turbo. Air injection/smog control are the same thing. Air is injected into the exhaust by an air [smog] pump to thin out exhaust gases. It's usually done closer to the cat but I've seen some [not trucks] that inject air thru the exhaust manifolds.
Are you sure these are the original manifolds to the truck? Could be something a PO pulled off a different model engine and plugged them off because they weren't needed.
No I don't mean a turbo. Air injection/smog control are the same thing. Air is injected into the exhaust by an air [smog] pump to thin out exhaust gases. It's usually done closer to the cat but I've seen some [not trucks] that inject air thru the exhaust manifolds.
Are you sure these are the original manifolds to the truck? Could be something a PO pulled off a different model engine and plugged them off because they weren't needed.
Thread Starter
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Freshman User
Joined: Jun 2010
Posts: 43
Likes: 0
From: Iowa City, IA
What year/engine do you have? That could lead us to some answers.
No I don't mean a turbo. Air injection/smog control are the same thing. Air is injected into the exhaust by an air [smog] pump to thin out exhaust gases. It's usually done closer to the cat but I've seen some [not trucks] that inject air thru the exhaust manifolds.
Are you sure these are the original manifolds to the truck? Could be something a PO pulled off a different model engine and plugged them off because they weren't needed.
No I don't mean a turbo. Air injection/smog control are the same thing. Air is injected into the exhaust by an air [smog] pump to thin out exhaust gases. It's usually done closer to the cat but I've seen some [not trucks] that inject air thru the exhaust manifolds.
Are you sure these are the original manifolds to the truck? Could be something a PO pulled off a different model engine and plugged them off because they weren't needed.
It is a 1992 F250 with the 351w.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
I believe that is where the air injection system hooked up.
Yea thats exactly what it is, my 87 has the same manifolds. Even though has a carb and is non catalyst, it had a air pumps, two of them with tubes running along the valve covers injecting air into the manifolds at each cylinder.
Hopefully you can just screw in a new plug, hope the threads are still there for ya.
Yea thats exactly what it is, my 87 has the same manifolds. Even though has a carb and is non catalyst, it had a air pumps, two of them with tubes running along the valve covers injecting air into the manifolds at each cylinder.
Hopefully you can just screw in a new plug, hope the threads are still there for ya.
Thread Starter
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Freshman User
Joined: Jun 2010
Posts: 43
Likes: 0
From: Iowa City, IA
I believe that is where the air injection system hooked up.
Yea thats exactly what it is, my 87 has the same manifolds. Even though has a carb and is non catalyst, it had a air pumps, two of them with tubes running along the valve covers injecting air into the manifolds at each cylinder.
Hopefully you can just screw in a new plug, hope the threads are still there for ya.
Yea thats exactly what it is, my 87 has the same manifolds. Even though has a carb and is non catalyst, it had a air pumps, two of them with tubes running along the valve covers injecting air into the manifolds at each cylinder.
Hopefully you can just screw in a new plug, hope the threads are still there for ya.
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Posting Guru
Joined: Nov 2009
Posts: 2,244
Likes: 1
yes u can weld it shut if u have super powers and are able to weld cast iron....
ok sorry for the sarcasm no u cant weld it shut because its cast iron ;P plug it or get shorty headers or run to a junk yard and get a set of manifolds off an older 351 :P
ok sorry for the sarcasm no u cant weld it shut because its cast iron ;P plug it or get shorty headers or run to a junk yard and get a set of manifolds off an older 351 :P
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Thread Starter
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Freshman User
Joined: Jun 2010
Posts: 43
Likes: 0
From: Iowa City, IA
I ended up going to a hardware store and getting a threaded cap that fit in there. So far it is working.
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