Extending/Repairing an exhaust manifold

So, this Oliver 1755 that I use. One of the issues that bugs me is exhaust at the driver's station. It seems that at some point in its life, the muffler clamp was loosened so that the muffler could be taken off quickly to park it in a low shed. This let the muffler rattle back and forth. Over time, it got sloppy; and it broke a small piece off of the end of the exhaust manifold.

So, the muffler would wobble around and exhaust would blow out of the manifold/muffler joint, fill the area under the hood and seep into the operator's (me) station.

The exhaust manifold has maybe four inches of "nipple" that the muffler mates to; then there is a lip that prevents the muffler from going any further. The break caused maybe an inch of that nipple to be lost.

I bought a new clamp and tried to re-seat the muffler. I was somewhat successful, but not what I would like. The muffler is pulled as far down as it can go. As in, the body is touching the hood. The clamp holds it in place; but the flaring of the end of the muffler and the short nipple still results in some leakage.

This is what I'm thinking...

I'll see if I can get some heavy iron pipe that matches the exhaust manifold nipple. Maybe about ten inches of it.

Set this pipe onto the exhaust manifold and use metal tape to seal the joint.

Get six inches of heavy exhaust pipe with the correct I.D. to slide over this. Take the grinder and slit it lengthwise so that it can compress.

Slide this "scab" pipe over the taped manifold to iron pipe junction and clamp above and below the joint.

This would leave me four inches of clean iron pipe that would stick out of the hood a little ways that I can now slip the muffler over and clamp the end to.

Any critiques?

Wish I had a picture of the manifold...

My concern is the outside of the manifold machined?

Is the inside of the manifold machined?

My guess is the outside is machined but the inside is a rough casting. Therefore the two pipes, the inner and outer would not match up, would not be concentric with each other.

Is there enough of the manifold left intact to just weld an extension on the muffler, push it as far down on the manifold as possible and clamp it? Maybe brace it to something on the engine to stabilize it and keep stress off the manifold.

Below is an ad for Wengers that has a picture of the manifold top section. I actually didn't realize that this was a separate section. Although I think it's a moot point; since the probability of cleanly unbolting this part is probably pretty low.

If you look at the top of it, you'll see the smooth section above the lip that the muffler slips over. It's approx 2-13/16" OD. It might be tough to match up some pipe.

http://www.external_link/parts/Farm-Tractor-Parts/Oliver/1755/1755/Exhaust/Diesel-engine/MANIFOLD-EXTENSION-RC/01-164268A.htm

(quoted from post at 00:39:23 03/06/14) Wish I had a picture of the manifold...

My concern is the outside of the manifold machined?

Is the inside of the manifold machined?

My guess is the outside is machined but the inside is a rough casting. Therefore the two pipes, the inner and outer would not match up, would not be concentric with each other.

Is there enough of the manifold left intact to just weld an extension on the muffler, push it as far down on the manifold as possible and clamp it? Maybe brace it to something on the engine to stabilize it and keep stress off the manifold.

Click to expand...

The following link has a photo of the manifold extension.

http://www.external_link/parts/Farm-Tractor-Parts/Oliver/1755/1755/Exhaust/Diesel-engine/MANIFOLD-EXTENSION-RC/01-164268A.htm

The fact that I can buy that separately from the exhaust manifold itself changes my thinking. I'm thinking now that I can band aid the leak that I have. It's much better now, at least since the muffler is clamped on.

That will buy me some time to loosen up the existing manifold extension and save up some funds to buy the new one and a muffler; since the muffler seems like it could use a replacement in the near future.