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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats Photos and information about antique steel wheeled farm tractors. This is where to find the heaviest of Old Iron tractors.

Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

Twin City 27-44 Restoration Started


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  #71  
Old 06-19-2010, 10:32:23 PM
Tony Thompson Tony Thompson is offline
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Default Re: Twin City 27-44 Restoration Started


Do not get to work on my tractor very often, but have made a bit of progress here and there.
The short block was set back into the tractor and it is time to start rebuilding and fitting all the external components on.
The engine in this tractor was trash, showing signs of accumulated moisture that pitted the oil pump to peices along with much of the rest of it.
For anyone needing oil pump parts for the big twin cams, many of them are the same on the baby twin cams. There are early and late versions but other than that I was able to get 17-28 pump parts to fit for my 27-44. The pump pressure regulator spring will flex under pressure and rub itself thin where it contacts the pump bore that it is installed in. These springs are available from dedicated hardware stores and must be replaced.
Second photo...here is the drive shaft and gear for the oil pump. At this point of assembly this stub shaft with gear on front has endplay. When you bolt the oil pump on, you must verify endplay again. If endplay is gone and pump gears are binding, then you need to add gaskets under front gear plate to set endplay, see third picture.Make sure to use soft copper sealing washers on the bolts that hold the oil pump to front gear case or they will leak oil.
Fourth photo shows top cap removed to afford access to a large slotted screw head with spring and check ball under it. with engine running, you can turn this plug up and down to increase or decrease your oil pressure setting. 20 lbs. is plenty.
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  #72  
Old 06-19-2010, 10:45:33 PM
Tony Thompson Tony Thompson is offline
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Default Re: Twin City 27-44 Restoration Started

I also have had my magneto refurbished and test run by Todd Cory at Cory Engines in Delavan, Mn.
Oil pump, water pump and mag is installed and "shimed or aligned" so the multiple function drive shaft runs straight and quiet reducing wear at the couplers.
On the other side of engine the governor has been serviced and installed. All the large headstuds were cleaned and installed with antiseize.
Heads will be next!
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  #73  
Old 06-20-2010, 10:03:39 PM
L Wilson L Wilson is offline
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Default Re: Twin City 27-44 Restoration Started

looking good!
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  #74  
Old 06-20-2010, 11:15:49 PM
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Phil Johnson Phil Johnson is offline
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Default Re: Twin City 27-44 Restoration Started

Nice to see some more progress, Tony. I didn't know the oil pump parts were interchangeable on the two sizes of tractors.
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  #75  
Old 06-21-2010, 12:33:43 AM
Tony Thompson Tony Thompson is offline
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Default Re: Twin City 27-44 Restoration Started

Phil,
Twin City part numbers are cleverly set up to help with speedy identification if you know how they work.
12-20 and 17-28 engine casting numbers start with TW, chassis casting numbers start with TY.
20-35 and 27-44 engine casting numbers start with AE, chassis casting numbers start with AT.
The oil pump on an AE engine has TW part numbers casted on it, this tells you it is the same (12-20,17-28)pump on both engines.
21-32 numbers are FE and FT,
KT numbers are KE and KT,
If you memorize the numbers you can pick a Twin City part out of a pile and know by the two letter prefex that it is an engine or a chassis part and also know what model it is off
Of
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  #76  
Old 06-21-2010, 10:51:38 AM
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Default Re: Twin City 27-44 Restoration Started

Tony; I just rebuilt the oil pump on the 12-20 and machined a new shaft for the driven gear and remounted it back on the front housing where it is supposed to be. I had to machine over .010" off the front housing to remove the gear tracks from the oil pump gears. Is that early style die cast pump housing reliable? I know a lot of that early die-cast material gets very fragile over time.
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Old 06-21-2010, 01:10:31 PM
Tony Thompson Tony Thompson is offline
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Default Re: Twin City 27-44 Restoration Started

Phil,
I do not understand the temperment and reasoning behind the use of die cast material that has also been refered to as pot metal or white metal.
The TC governor housings (not early 12-20 Pierce governor) were die cast as well. Many of them are cracked and crumbling away. Others look fine. The housing on my 20-35 is covered with cracks and have not touched it because I believed it would break to pieces when I tried to dissassemble it. I have found a used replacement that looks to be in sound usable condition.
In short, I have learned that some of these inferior castings desintegrate while others last for many years. If the casting in question is in decent condition, it should be fine for some time to come.
The later oil pumps are cast iron, (gee, I wonder why )
The governor housing on my current 27-44 resto is in perfect condition - maybe some of them were replaced with better quality parts in the forties or fifties
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  #78  
Old 06-21-2010, 10:31:02 PM
Tony Thompson Tony Thompson is offline
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Default Re: Twin City 27-44 Restoration Started

Time to report some specs on the heads for 20-35 and 27-44.
There is very little information circulating about the different components of these machines because original owners have passed on and very few of these tractors are actually getting restored. Most of them just set in a collection somewhere with their past remaining a mystery.
I have learned a great deal about thease tractors the hard way...hands on resto work, many hours studying original litterature and careful examination of everyone I ever ran into.

I have been told in the past that all the heads for these low production machines are all the same...Wrong!
Be very carefull if you are going to head swap a big twin cam. Even the parts book shows a high compression head and a low compression version, however, it gets more complicated than that.
The head numbers start with AE and are found on the top of head under the valve cover. there is a way to identify different heads from the outside of a complete engine without any dissassembly. I have a couple of photo's of the heads for my tractor that were just serviced at Todd Cory's shop in Delavan, Mn. My tractor has a set of low comp. heads on that are seldom seen. I assume that since it was a road builder, it was ordered this way to run many hours at a time on kerosene or disilate
In the last two pictures I am measuring the depth of the chamber and overall height of head casting from top to bottom.
Here is what I have learned.
AE 3A is a low comp. head with a huge chamber that is 2 1/2 inches deep. This head is 7 1/4 inches tall. It uses a smaller diameter valve stem than the other heads. I believe this to be a very early 20-35 head. In an attempt to calculate chamber volume and comp. ratio, I was stunned to realize that this head may only provide about 3 1/2 to 1.

AE 3G is a medium comp. head with chambers that are 2 1/4 inches deep and outside hight of 7 1/8 inches.

AE 203F is the high comp. head and is by far the most common one used on these tractors. The chamber is 2 inches deep and the hight is 6 7/8 inches tall.

As you can see the chambers are 1/4 inch apart from one another and outside casting hight is 1/8 inch apart from each other.

All of these heads actually produce fairly low compression and I have seen 1/4 in thick plates bolted to the top of pistons in an effort to get more power out of them. There was a few AE 203F's that had provisions cast in them to run dual plugs, but I have yet to see one that was drilled and tapped for all four plugs...may have been a factory plan that was never carried out
Later on after the merger, MM tooled up for and produced a two valve semi hemispherical head for this engine but it was only applied to 641 ci. stationary engines.
I had a very puzzeled 27-44 owner contact me claiming he had torn into his tractor and it had one four valve head on it and one two valve head on it. Apparently the only available replacement head for that tractor at the time of need was a late two valve power unit head
I had better get out to the shop and start making some head gaskets, good luck on all your projects everyone!
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  #79  
Old 06-21-2010, 10:47:09 PM
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Default Re: Twin City 27-44 Restoration Started

Good Information, Tony. You've done a lot of work! I'll check heads on mine.
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Old 07-17-2010, 08:45:57 PM
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Default Re: Twin City 27-44 Restoration Started

Valvetrain report,
Most of these engines end up with badly worn top end components if they were used hard. This engine was designed in 1916 or 1917 and the valvetrain needed to be hand oiled through a set of small pipes/cups protruding through the hood on a regular basis to minimize wear.
In the past several of these machines were up-dated by ingeious owners that piped oil from the pressurised lower end gallery to the top of valve covers to avoid the regular hand oiling schedule. Oil had to be delivered to eight different sites atop the valve covers making a bit of an under hood plumbing nightmare.
Late in the 27-44 production run, the factory supplied a new rocker arm bracket and shafts to provide force feed lubrication to the top end. These new parts did a tidy job of oil delivery with only a tee and two short oil lines up top.
Many of the earlier tractors were fitted with this conversion and so was #250417 that is being restored here.

First photo shows assembly for one head, second one dissassembled, third and fourth pictures show early AE41B hand oil rocker stand and later AE41D recast with oil gallery in it.
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