• If you like antique engines, vintage tractors or old iron machinery, register and join us. When you register on Smokstak, please give complete answers and fill in all blanks. IF YOU ARE ON WIRELESS OR SATELLITE, GIVE YOUR CITY AND STATE! NO ZIPCODES! All registrations are manually approved.

WK40 McCormick - How Many Are out There?

Nick Feltis

Registered
Re: WK40 Mccormick - how many are out there ?

My WK-40 is a little cobbled, it has the RD450 and points instead of a mag. and my governor runs of the V-belt for the fan. Plus I was to cheep to by a brand new recast manifold so I found a good truck manifold with a Holly carb. The biggest fight I had with that is the truck manifold card has that air governor on it and it fights with my belt governor, the first time it revved why to high. I got it idled down now but have no throttle response and no power. And the truck manifold is wrecking the paint on the frame, because its a down draft system like most truck manifolds and now I have a hole in my hood not being used. When most people put these manifolds on what steps are they taking? I know some pullers say with a 450 with the truck manifold the can out pull most 3020 JDs and some 4020. I'm not looking to do any pulling but I would like to belt up to the sawmill someday so the power would be nice.
 

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

Thanks Eric for passing the information along. We are giving some thought to repowering one of our W-40's with a truck motor as the pile of reusable FBB 298 parts is not very large at this point.
Some data to add to your conversion info:
1. The open back pilot bearing can be replaced with a SKF 6206-2ZJ sealed bearing.
2. An Oliver 77 starter is supposed to be a bolt on fit. (I have not tried this yet). It would take extensive modification of the air cleaner pipe on a crank start model to make this work.
You are right about the flywheel...I believe that it's the heaviest I've ever encountered on a 6 cyl.

I had admired this WK-40 ever since I met my friend Lee. I suggested that we get this tractor running to use on the thresher and to make a vintage entry at a local plowing day. The engine was still loose....I thought how hard can this be? The only premonition of bad things to come was a crack in the water jacket behind the carb. It turned out that the block web between the cylinders was cracked on the top AND the bottom. To make matters worse the oil pump drive gear on the camshaft had stripped out and there where 4 burned out rod journals on the crankshaft. The worst journal was .070 under STD. The oil pump shaft was bent and the top of the housing has broken just below the gear. Not exactly the kind of news we wanted to hear....
So the search for parts has started.

Serial # on this tractor is WKC 2811.
 

Attachments

Lyn Jones

Registered
Age
71
Re: WK40 Mccormick - how many are out there ?

The Oliver 77 starter is a bolt on fit. It just needs a 5mm (3/16th) spacer for the starter drive (Bendix) to clear the flywheel ring gear.
The existing air cleaner to carb pipe can be carefully cut and welded to clear the starter. I've done it on two WK-40's.
I still own the 1936 one on steel, but have sold the 1937 model on rubber. Pics of the tractors were taken before being fitted with starters.

1936 Serial no WKC 2866
1937 Serial no WKC 6628
 

Attachments

Eric Best

Subscriber
Last Subscription Date
07/13/2019
Re: WK40 Mccormick - how many are out there ?

Bahart - Nice picture of the wheel. This has the shoulder for the dual extension drum. Briefly, dual 32" wheels were approved for the W-40 and WD-40, then disapproved by IH because of insufficient clearance between the tires. I wonder if this might be part of one of those setups. One last thing I'd ask you to check. Is there a spacer between the hub and the seal sleeve on the inside of the hub? If so, these could also be an F&H center for dual wheels on an I-9, I suppose, although I have an I-9 on duals and the hubs do not have these markings.
 

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

The Oliver 77 starter is a bolt on fit.
Thanks for the confirmation on the starter information and the informative picture description of the air cleaner pipe alteration. It came out very nicely.
Do you have any info on how many WK-40, WD-40 tractors still exist in the UK?
 

Brian Ahart

Registered
Last Subscription Date
03/28/2015
Re: WK40 Mccormick - how many are out there ?

Eric, thanks for the information. I'm not aware of a spacer, but will double check.
 

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

Dudley has a WK-40 and WD-40..both are 1938.
Nice tractors. The WK appears to have the 34" drop center rims that Eric alluded to in a earlier post. It looks like they are a nice fit. We were thinking of doing this on one of our W-40's to replace the junk 32" rims. 18.4 X 34's are taller than the original tires...should a guy stick with 16.9 X 34's instead?
 

Eric Best

Subscriber
Last Subscription Date
07/13/2019
Re: WK40 Mccormick - how many are out there ?

You can't do much with the 18.4 but parade it. Any mud or dirt that sticks to the tires will interfere with the fenders. The 16.9 is just fine.
 

Titan1020

Registered
Last Subscription Date
10/03/2016
Re: WK40 Mccormick - how many are out there ?

Wondered where the WD-40 went. Belonged to a good friend of mine here in Ohio. Ran it for him at shows many times. It's one fine WD-40. Known it's whereabout for about 30 years.
 

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

The Oliver 77 starter is a bolt on fit. It just needs a 5mm (3/16th) spacer for the starter drive (Bendix) to clear the flywheel ring gear.
When you fitted these W-40 crank starts with starters did you also fabricate a charging circuit? I would like to see how this might be accomplished as the crank start models are not a user friendly design to mount and drive a generator.
 

Eric Best

Subscriber
Last Subscription Date
07/13/2019
Re: WK40 Mccormick - how many are out there ?

The "correct" way would be to obtain the governor cover/oil filler that has the generator mounting surface on it. You'd also need the mounting strap that carries the generator and bolts to the governor cover and the adjustment strap. The water pump pulley has to be changed to have the additional pulley for the generator. The generator itself should be no problem. Getting the casting done for the governor cover wouldn't be a huge challenge.
 

Lyn Jones

Registered
Age
71
Re: WK40 Mccormick - how many are out there ?

When you fitted these W-40 crank starts with starters did you also fabricate a charging circuit? I would like to see how this might be accomplished as the crank start models are not a user friendly design to mount and drive a generator.
No, I didn't. I just charge the battery as required. Here's a closeup pic of a generator on a WK-40.
 

Attachments

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

The water pump pulley has to be changed to have the additional pulley for the generator.
Yes the lack of any kind of generator drive pulley on the crank start W-40's present a problem. I was hoping that Lyn Jones had figured out a clever solution to this dilemma.
Being a realist I realize that the double pulley W-40 water pumps are probably not going to be all that easy to find.
The front half of the W-40 water pump closely resembles the one used on the Farmall M's. I'm wondering if the double pulley off the M pump would fit on the W-40 pump. Has anybody tried this?
 

Rob Charles

Sponsor
Last Subscription Date
04/05/2017
Re: WK40 Mccormick - how many are out there ?

Here's another WK-40 being worked on. It was running but smoked enough to be used as "Misquito" control. 3 cyl.s were pitted from rust at the top. The tractor was an older restoration and running when my friend bought it about 12 years ago.It was taken down for repairs but not too much was available for parts. So I have sleeved the sleeves. I also picked up new rings by size and am going to widen the grooves to salvage the pistons. Here are some pics.The manifold in the pics is what was on it. It is a gasoline manifold which I am not sure if it's even right for a W-40 tractor.. We did get 1 of those nice Rosewood Kero Manifolds for it . Rob
 

Attachments

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

The manifold in the pics is what was on it. It is a gasoline manifold which I am not sure if it's even right for a W-40 tractor.
I think that the manifold is off a U-21 power unit. If and when we get a W-40 up and running we want to covert it to electric start. Your water pump and generator mounting pictures will be useful. Where are you getting the upper end and pan gaskets and what will you be using for the lower sleeve seals?
 

Rob Charles

Sponsor
Last Subscription Date
04/05/2017
Re: WK40 Mccormick - how many are out there ?

Hi Mark, The upper gaskets came from Tom Underwood about 4 years ago.The sleeve seals are going to be made from round O ring cord stock I hope. I am ordering a few sizes from MSc.I have made o-rings for other farmalls from the cord stock and they worked fine. The WK -40s use retangular cross section o -rings so I have my fingers crossed.Valve guides are going to be re furnished with bronze bushings. The pan gasket should be the same as one of the newer Red (I think) Diamond truck engines. Supposedly still available at a Navastar dealer.Rob
 

Mark Schneider

Registered
Last Subscription Date
11/14/2018
Re: WK40 Mccormick - how many are out there ?

The "Search" continued from post # 22.....

So Lee and I found ourselves with a tractor and not very many reusable motor parts. Our first plan of action was to place an add on a local internet shopper which only yielded some 22-36 and 10-20 parts tractors. Lee had spotted a pair of W-40's lying out derelict and contacted the owner. Initially only one was for sale and we made a trip to go check it out on a lovely -10 degree morning. Engine was still loose,the manifold looked good, the tinwork, and tank was nice. Once again I thought "How hard can this be?" The belt pulley was off and the front of the transmission had sat open for years. I thought the tranny would probably be toast due to water intrusion. The only premonition of bad things to come was the fact that the clutch housing had gutted by a fellow with a sledge hammer back in the day when this tractor was only junk and not yet an antique. Most of the bellhousing over the flywheel had been busted off.

Our thoughts at this time was that this "good" engine could be removed and installed in #2811. A couple of weeks after these pictures were taken Lee cut the owner a deal on both units and bought them. And then the wait to get them hauled....

Serial # on this tractor is WKC 9842
 

Attachments

AUSSIE TD-40

Registered
Re: WK40 Mccormick - how many are out there ?

that looks like you will get some good parts, on factory rubber wheels, is it a 4 speed?


Jake.
 
Top