I have an `85 F350 with 460. It came with the air pump injection system which has been removed due to it being non-functional. As part of the air injection system there are pipes running to the back of each cylinder head. What was the purpose of these pipes and what are the pipes actually plumbed into? Are they simply open to the inside of the motor? What is involved in removing the pipes?

Thanks in advance,

Mark

 

Ok I am no expert here but I noticed your post after I had just started a new thread with questions about air pumps on a 460 myself. I do know that the air pipe is plumbed into your cat. Pupose has to do with emssions I believe. I also know (at least in 96 460) that the truck could have come with or without a pump. that is what my post is basically about, the dif. If you have gotten any more info on this I would apprciate the skinny, as I have not been to successful at getting answers to any thing to do with air pumps.

TA Lock

 

 

mchild

On the 85 the those pipes fed air into the exhaust in the heads. The cross pipe is held on with a single bolt on each side. As far as I know they do not go into cat. On the newer vehicles they do though. You can plug them with a thermactor pipe, cap plug. It is a specific size, you can get them at NAPA.

I have installed them with the motor out, they could be a bear to get in with the motor in the truck.

 

Your going to have to thread the pipe holes. They are smooth bored to allow the air pump tubes to be placed in there and captured with a bracket and bolt. I had my plugged when I rebuilt my engine. I also noticed that the #3 and 6 exhaust port have a runner going towards the inboard side of the head. The purpose of this passage is to heat the lower end of the intake manifold. You may want to concider plugging that up too. I did mine and I can tell you my intake manifold temps aren't as high. Just means a colder intake air charge temp.

 

Mine just tapped in like a freeze plug, no threads. But as said, it is a specific size to fit properly.

 

LOL wait until you have to redo it because your exhaust pressure blew one out.

 

On my 86, the exhaust manifolds themselves are what the air pumps were hooked into, nothing hooks to the heads themselves.... It still didn't do anything but add more volume to the exhaust stream, as the truck was non-catalyst from the factory...
Evan

 

airharley

They have been in for almost two years and not came out yet.

Have the ones that are on the front of your heads blown out?

It takes the same size plug on the back of the head as it does on the front. It is a thermactor port plug and it is a specific size and it drives in tightly. And it carries a specific part number at NAPA. It is not just a standard metal cap plug.

 

My machine shop suggested I use the press-in plugs instead of a threaded plug. They are working fine for me so far.

John

 

f350BRONCO IS RIGHT. IF YOU LOOK AT THE FRONT OF THE HEADS YOU WILL SEE THE SAME HOLES WITH FREEZE PLUGS IN THEM. THERE IS ONLY A SMALL PUFF OF AIR THAT COMES OUT OF THOSE HOLES. IF YOUR 85 IS LIKE MY 86 IT IS VERY HARD TO GET A WRENCH ON THE BOLT THAT HOLDS A U-CLAMP BUT IT CAN BE DONE. IF IT IS MORE WORK THAN YOU FEEL LIKE YOU CAN CUT THEM AND CONNECT THEM TOGETHER WITH A PIECE OF 5/8" VAC. HOSE, OR JUST FLATTEN AND ROLL THE ENDS.

 

I'd like more information on thi as I have just recently removed
my 86 F250's AIR pumps and would like to clean the engine bay
up some...

Thanks!
Scott

 

Clifford II

This is the part number on the box that my local NAPA store ordered for me to fit the Ford 460 thermactor pipe, port holes, Clevite # 219-2188.

Now this box had several of these plugs in it, as they said they could not get just a pair. Which was fine as I have used them for another 460.

Maybe your store can use this number and just get you a couple if thats what you need.