The two cylinder Wisconsin TJD and THD are both rugged, air cooled, cast iron workhorses used widely as sander engines on the back of snow plow trucks, to power irrigation pumps in cranberry bogs, in log splitters and many other industrial applications. Wisconsin Motors began producing air-cooled engines in 1929. These engines, while old and now no longer available as new engines, are still out there in large numbers, working away, day after day (there is a lot to be said for American-made,  air cooled cast iron engines).
Because the factory no longer makes this engine and no longer effectively supports it, ordering parts can be difficult. Especially if the specification tag is missing from the shroud and you don’t know if you have a TJD or the earlier THD. Sure, it helps to know that the pistons on the THD rise and fall as simultaneously as a pair and on the later TJD, the pistons move in an opposite fashion, with one rising as the other is falling. But if the spec tag is missing, it is hard to tell from external appearances exactly which Wisconsin engine you have.
Displayed below is an easy way to tell a THD from a TJD.

Wisconsin Model
Magneto Ignition
Distributor Ignition

Wires straight across
Two plug wires in line with coil wire

Wires at an angle
Three wires forming a triangle

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This Tech Tip is one of a number that we publish for the engine community. This new Tech Tip discusses the importance of cooling fans on Deutz and Wisconsin air cooled engines and suggests a neat trick to avoid major problems.
Many Deutz diesels, such as the Deutz 912 and 913 Series (as well as all Wisconsin engines), have large cooling fans. These fans are often called blowers or, in the case of Deutz, referred to as impellers. Deutz cooling fans are belt driven and draw air into and across the engine to cool it. Air cooled engines, such as the F6L912 Deutz series, are simple with no radiators, water pumps, or hoses to worry about. They work reasonably well especially in applications such as rock crushers or drill rigs which vibrate heavily and shorten the life of conventional radiator equipped cooling systems.
The problem with an air cooling blower shows up in especially dusty or gritty applications, such as engine-driven concrete saws. Over time the fans collect concrete dust or grit and load up. This can lead to significant issues, especially on Wisconsin engines where the flywheel is the cooling fan. Worn cooling fans and clogged cooling fans or flywheels lead to two different problems.

Engine Overheating: If the cooling fan is run in a dirty or dusty environment, and not maintained, it will gradually wear the impeller fins so they no longer have a close fit to the housing. As a result, the air cooled engine will eventually overheat without anyone knowing the reason.
Crankshaft Problems: When your air-cooled Deutz or Wisconsin is running a concrete saw, the dust sometimes can cake on the fan. This leads to an out of balance flywheel. This will cause vibration problems and eventual crankshaft failure.

But we have found a partial solution. We suggest that anyone who owns a Deutz or a Wisconsin engine, powering a concrete saw, or an engine working in a dusty environment, should paint the impeller with yellow paint to monitor the buildup of dust. Once the yellow paint is covered up this is a tell-tale sign to shut the Deutz or Wisconsin engine down and do some much needed maintenance.
Running a fleet of Deutz powered equipment? Have a boss pushing you to save money? When you do have a worn blower or impeller, one that is worn beyond a mere cleaning, make sure that you replace it with the correct one, not just one that “fits”. For example, while the impeller from a Deutz F2L1011F or Deutz F3L1011F has the same mounting bolt pattern as one on a four cylinder Deutz BF4L1011F and will mount in its place, it won’t properly cool the larger engine. This will lead to problems.
For more information on Deutz and Wisconsin engines check out some of our previous Tech Tips like:

Tech Tip #72: Saving Worn Deutz, Continental and Wisconsin Blocks,
Tech Tip #125: Deutz Diesel and Ford Industrial Engine Timing Belts: All You Need to Know to About Deutz and Ford Timing Belts, and
Tech Tip #168: Deutz 1011 and 2011 Timing Belt Change Intervals: All You Need to Know About Deutz Timing Belt Change Intervals.

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Great tip on starting your Wisconsin Engine under a high load
Recently, some of our customers have told us that Wisconsin engines with high accessory loads may benefit from a new starting procedure, one different than what is specified in the operators’ manual. The high shock loads that inhibit easy starting are due to hydraulics, fans, etc., that are not disengaged prior to starting. They prevent the engine from easily getting up to speed. This Tech Tip will remind some mechanics of the compression release process in older, hand start diesels.
To enable the engine to get to the optimum speed:

Make sure the throttle is fully shut and the choke is off (plate open).
Engage the starter, spin engine for 3 seconds to allow engine speed to increase, then pull back in when the engine fires. The choke plate should not have to be closed for more than several seconds, even in cold climates. Do not use ether.
If the engine stalls, repeat the procedure, this time pushing the choke in more slowly after the engine fires.
Choking may not be necessary for hot restarts. If required, use only a quick pull of the choke after the engine is spinning, with an immediate return to the open position.

Foley Engines, your Wisconsin engine specialist, wants to help. Please call us with any questions on this Tech Tip. If you need more details, we have workshop manuals ready to mail out to you. If your engine is too far gone, we have new and remanufactured engines on the shelf ready to shop with next day delivery available. New and remanufactured Wisconsin power units, too. Please call us with any questions.

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Quick guide on identifying Wisconsin engines
Want to identify an air cooled four cylinder Wisconsin Engine? Even if the Wisconsin factory support is drying up, we can help!



These 30 horse power engines have 5/16¼

Head bolts. (use a 1/2 socket)

This 37 horsepower engine has 3/8¼ head bolts. (Use a 9/16¼ socket)

V461, V465
These are overhead valve engines, not flatheads.

Please call us with any questions or if you need a workshop manual for one of these Wisconsin engines. We have these manuals in stock ready to ship for a nominal price (they come free with our engine overhaul parts kits and we will deduct the price paid for a manual from the purchase price of a kit).
Thank you.

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