IH BD 240 with Zenith 228 Carb & Vari-Speed Governor

I'm working on my Pettibone fork truck again this winter. Bought a carb kit for it a while ago, and am finally getting into it. See pics here: https://imgur.com/a/yOqwm

I'm having a heck of a time searching for parts online. I have a full set of manuals for this thing, including a separate parts manual for the UB-240 power unit that is mounted on this fork truck.

All the IH parts numbers in the manuals are out of date for this new age of online searching, absolutely none of them come up. I've usually had good luck trying to search on the NAPA website for part number interchange, but ziltch...

It looks like at some point the carb and velocity governor were swapped out on this machine. All the IH numbers on the parts don't match the parts book.

The velocity governor as near as I can tell should be a 2800 RPM governor. I'm hoping someone here has experience with these old governors.

Do these units simply act like a rev limiter? There are two labeled ports on this governor, one reads "carb", the other one reads "to distrib". Both are blocked off on this unit, but there are vacuum ports on the flanges, so I assume this thing works off of intake vacuum?

There are various examples of these on eBay, some for silly prices:
https://www.ebay.com/itm/1971-Chevr...2707759225&_trksid=p2047675.c100005.m1851

I'm wondering how I make sure mine works, or if I buy an eBay unit, how I go about adjusting it? I assume these have to be adjusted with the machine under load? No idea... Hope someone here is familiar with these.

Last velocity governor I worked on was in 1957 on the 3/4 ton Dodge military truck. It had no lines running anywhere as far as I remember as it was completely self contained. The governor IH used on all their trucks, which I worked on several from 58 to early 70's were rpm limited by a centrifical spring loaded weight in distributor. It regulated max rpm's by limiting vacuum to spring loaded diaphragm on carburetor. So, for that type to work it needs a compatable distributor. Also, all the BD 220, 240 or 264 engines IH was using were all equipped with Holley carburetors. I also do not remember goverors on those smaller six cyl engines, just the larger engines. Might be wrong on that though.

Here are some pages form the IH UB-240 manual I have for my machine.

Vari-Speed governors: https://drive.google.com/file/d/1K0CvFqcd_Z0zAIVexGNaPnWyGFwkp8OA/view?usp=sharing

Zenith 228 BV carb: https://drive.google.com/file/d/1yYgc7wQbjf-8zkr6Gpw7-5S__kyBJ0kQ/view?usp=sharing

I think I am supposed to have the 317 650 R91 2800 RPM governor.

I see nowhere in any of the manuals I have that it is plumbed to the carb or distributor.

So far I am finding out this UB-240 industrial power unit is a different animal and guys who worked on IH trucks like yourself have different recollections on what is what. It's all a bit confusing. It seems like there is a lot of lost knowledge when it comes to machines like this old Pettibone.

Above link for the governor is wrong, use this one: https://drive.google.com/file/d/1StI_dHjNODO9Mfg6jDFTUJ0FmqebeL7h/view?usp=sharing

Hate that I can't edit posts here

To complicate matters, it looks like the velocity governor I have in the fork truck is a Introl unit, whereas in the parts books it calls for a Hoof governor, which is a different manufacturer/different style.

I'm beginning to suspect that the UB-240 industrial engine was swapped out for an IH truck engine at some point, and the Zenith carb and governor came along with the swap. This would likely mean the engine is not tuned properly for the application, truck engines ran a different RPM range...

I am no expert on this but I have a 1947 Studebaker truck with a similar set up . The governor is a Hoof brand that works off the vacuum of the engine . As the RPM increases the vacuum pulls a butterfly in the governor closed to control the RPM . What little I know , there are different Hoof governors for different engines .I have probable shown my ignorance of the subject in this post , but maybe it will help .

After researching this issue further, I think I may have the original, or AN original UB240.

The casting number on my block is 316 275 R1 https://i.imgur.com/crv8aQp.jpg


The parts manual I have for the UB240 is calling for a 316 275 R11, so, one digit short.... Which is confusing.

The service manual I have for the UB240 calls out for the serial number stamping to be on a pad right behind the water pump on the right side of the block, right where mine is: https://i.imgur.com/xm1izw9.jpg

I actually have the original "log book" for my machine, that lists all the serial numbers for the different parts of the machine as it rolled off the line. In the log book the "UB240" serial number reads: 4979HANLQI, which is what I see on the tag located on the bell housing: https://i.imgur.com/puC8cuX.jpg

However, that is the S/N for the entire UB240 power unit, not the actual engine. The numbers stamped on the block pad are "BD 240" and "1013488" Unfortunately I have no literature to support that this is indeed the original engine, but it does seem like it is an IH industrial UB240 engine based on where the stamped pad is located. I guess the truck engine pads were not right behind the water pump. (from what I have read so far).

So now, I am thinking the engine is the original (seems odd to have such good compression on an engine where the hour meter reads 6500 hrs., but I guess it could have been overhauled...) However, it does have the wrong carb and the wrong velocity governor on it, when looking in my parts manual.

It seems like an IH truck carb and velocity governor were transplanted onto this engine for some reason or another.

I do know that, this machine started out as a crane that someone converted to a fork truck, and they left the HYD winch (https://i.imgur.com/PWAENYn.jpg) for the crane on the machine, just took the levers off the HYD manifold that operates the winch...

It is a 47 year old machine, that's a long time for a lot of "funny business" to go on with it. I just need to determine what the velocity governor is supposed to be set to, the service manual has a bunch of ranges, starting at 1600 RPM all the way up to 2800 RPM.

Anyone have an opinion on what the two numbers on this tag mean? https://i.imgur.com/puC8cuX.jpg Do you think the 2950 and 2400 numbers have anything to do with RPM? I'm thinking 2950 @ max idle and 2400 @ max load? Just a guess...

I really hate that I can't edit posts, here are images for the post above, in order: