Two fuel manifold

I have a WD with a two fuel manifold that is in good shape, I would like to put on a standard gas manifold so that I can get a tight fit on the muffler. One of two things is that something I can buy something that fits into the two fuel manifold that allows for a tight fit of a muffler thru the hood on a two fuel manifold or is the two fuel manifold interchangeable with the standard gas manifold for a WD and I just swap out the manifold?
 
You wouldn't have any problem installing a gas only manifold. With your current manifold is the muffler connected to the side port and coming up at an angle and beside the
hood? Some of the two fuel manifolds have an outlet straight up as well and a plate cover bolted on the side, does yours have the straight up option? You can usually fit a pipe
snug into the upper outlet. It's important that the muffler has some kind of collar on the bottom so no water seeps in around the pipe at the manifold.
 
(quoted from post at 17:34:15 05/29/15) You wouldn't have any problem installing a gas only manifold. With your current manifold is the muffler connected to the side port and coming up at an angle and beside the
hood? Some of the two fuel manifolds have an outlet straight up as well and a plate cover bolted on the side, does yours have the straight up option? You can usually fit a pipe
snug into the upper outlet. It's important that the muffler has some kind of collar on the bottom so no water seeps in around the pipe at the manifold.

My comes out on an angle and there is a pipe that fits in the G plate on the side of the two fuel manifold, then in curves in so that the muffler fits on that pipe and come out thru the top of the hood. The problem is it leaks pretty bad in the G section where it comes out.

I noticed today that the two fuel has 4 studs that have 9/16" stud heads and 3 of the 4 are loose. The two middle are 3/4" heads on the studs, I thought on most standard manifold the studs were the same size? Makes me nervous a standard manifold will fit.
 
The studs are all the same size from the beginning. I assume you haven't owned the tractor since new or you would know the service history. The studs that appear to be bigger is
likely from a repair done in the past. Maybe studs broke off and after drilling them out they threaded in the bigger studs. Unless your WD was dual fuel from the beginning it's
possible that this dual fuel manifold was put on as a replacement. The holes that have the larger studs could likely be repaired with "heli-coil" and then you'd have them all the
same size as from the beginning. If you have difficulty finding a good used manifold they are available brand new and not too expensive. Let us know how you make out.
 
(quoted from post at 06:05:43 05/30/15) The studs are all the same size from the beginning. I assume you haven't owned the tractor since new or you would know the service history. The studs that appear to be bigger is
likely from a repair done in the past. Maybe studs broke off and after drilling them out they threaded in the bigger studs. Unless your WD was dual fuel from the beginning it's
possible that this dual fuel manifold was put on as a replacement. The holes that have the larger studs could likely be repaired with "heli-coil" and then you'd have them all the
same size as from the beginning. If you have difficulty finding a good used manifold they are available brand new and not too expensive. Let us know how you make out.

I took the bigger studs out today and it looks like they fit the two fuel manifold just fine. They are 1/2" diameter verus the other 4 at 3/8". My thought is that if you drilled those 2 center holes out to 1/2", you would take 1/32" on each side of the hole, would you feel comfortable that the walls are thick eough to handle the lose of 1/32" on each side of the hole in the manifold? Would pictures help?
21758.jpg
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I found this pic and it is exactly like mine on my wd, see the two holes next to the box, those are 1/2". This pics says it is for a WC or WF
21758.jpg
 
These are good pictures you posted. Is your WD tractor altogether gas/kerosene equipped. Does it have the one gallon gas tank under the hood on the right side? If it is, your
exhaust manifold set up would be original. I have one WF (identical manifold to that in your picture) that is gas/kero but the tractor is thousands of miles away so I can't just walk
out and check the center studs. I could be wrong on the size of those middle two. I have one WC and one WF with combo manifolds that have a flat plate screwed into place
covering the outlet on the side (pipe goes straight up from the top) and I will check bolt sizes on those and get back to you in a couple of days. The latter two tractors were gas
only models from the factory.
 
(quoted from post at 07:19:01 05/31/15) These are good pictures you posted. Is your WD tractor altogether gas/kerosene equipped. Does it have the one gallon gas tank under the hood on the right side? If it is, your
exhaust manifold set up would be original. I have one WF (identical manifold to that in your picture) that is gas/kero but the tractor is thousands of miles away so I can't just walk
out and check the center studs. I could be wrong on the size of those middle two. I have one WC and one WF with combo manifolds that have a flat plate screwed into place
covering the outlet on the side (pipe goes straight up from the top) and I will check bolt sizes on those and get back to you in a couple of days. The latter two tractors were gas
only models from the factory.

Thanks for all your help on this, I appreciate it.

It does not have the small tank,, looks like a regular with the exception of the manifold. Could you measure the size holes in the middle on a regular gas manifold? As you can see when I took the center bolts out they were clearly 1/2" and does not look like the head had been redone to accomadate them. I still believe i could get away with making the center 2 holes 1/2",particallarly if the hole is a little over 9/16" as manufactured.Thanks for you help on this I do really appreciate it.
 
So it's got the small tank... it must have been a kerosene model from the factory. The next thing to check is the engine number...it's found on the left side of the block half-way
between the carburetor and the air cleaner. A flat raised rectangular space on the block. You may have to use sandpaper or a steel brush to clean it off to see what it says. There
will be a row of numbers and at the end it will have a K if it's a kerosene version or GA if it's a straight gas engine. I did look over the four tractors here in the yard and all the
manifold studs are 9/16" including the middle two. The '47 WC and the '49 WF have combo manifolds but with the flat plate screwed shut and the pipe coming straight up
through the hood. If you find a straight gas manifold and the center holes are only for 9/16"th studs you could always manufacture two studs with 1/2" thread going into the head
and the rest 9/16th to make it work. I would hesitate to try and drill bigger holes because sometimes the castings can be a bit on the thin side.
 

I think I will go the studs that are 9/16" with 1/2 threads, I have a 3rd generation blacksmith shop that can make anything, thanks for your help.
 
I'm sorry...I guess I was just reading too fast and I missed the "not". Nice chatting with you and soon you'll be all fixed up and enjoying your tractor once again.
Eric.
 
I should have clarified that the studs I referred to as 9/16 really are 3/8 but have a 9/16 nuts. What appears a little deceptive to the eye is that the factory original nuts on the 3/8 studs for the manifold had nuts that take a 5/8 wrench. If this isn't enough confusion?? .... LOL!!
 
(quoted from post at 17:11:07 06/01/15) I'm sorry...I guess I was just reading too fast and I missed the "not". Nice chatting with you and soon you'll be all fixed up and enjoying your tractor once again.
Eric.

Yes, I think you for your help.
 
I had a rusted out dual fuel manifold on my wd when I bought it. A gas manifold was a direct replacement. I did my new studs and nuts to replace the old rusty ones though.
 

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