Propane-Powered Portable Pto

Propane-Powered Portable Pto ENERGY Alternative Fuels When Larry Ristau needed a 400 rpm pto to power his grain dryer he modified an old combine engine to run on propane and turned it into a stand-alone power source Located close to the dryer he didn’t even need a separate fuel tank He just plumbs it into the dryer’s LP fuel system “The engine was from an IH 203 self-propelled combine that had been sitting in my neighbor’s pasture ” says Ristau “I added an LP gas carburetor/mixer and vaporizer and parts from other salvaged equipment It didn’t cost me much and it works great ” The 150 cu in 4-cylinder engine needed surprisingly little work after sitting for years Ristau replaced the water pump oil pan and several seals and gaskets No internal repairs were needed He mounted it on a trailer made from an old irrigation pump frame “I used a bell housing flywheel clutch and gearbox from a B engine on an old IH 64 pull-type combine ” says Ristau “It bolted direct to the back of the 203 engine International didn’t change the machining on their engines for about 20 years ” Ristau had to change the carburetor manifold on the 203 engine It was too large for his LP carburetor A salvage yard operator suggested a manifold from an older Farmall tractor A neighbor gave him a Century brand carburetor/mixer and a matching vaporizer from an old Super C he had converted from LP to gas The vaporizer was shot but a company that used multiple forklifts gave him 3 old Century vaporizers suggesting he might be able to make one good one out the parts “The carburetor and vaporizer need to be the same brand for them to work together ” explains Ristau He also needed to do some work on the throttle and clutch The IH 64 had a rod that ran from behind the operator’s seat to the clutch on the B engine When the operator pulled on the rod it engaged the clutch and brought the engine up to speed Ristau disconnected the throttle from the clutch linkage He then reconnected it to a small hand throttle from an old Farmall Cub and installed it over the bell housing He also replaced the clutch engage and release rod with a squeeze lever from an old McCormick grain drill Ristau admits he lucked out when he installed a pto shaft and bearings from an old Allis Chalmers He mounted it alongside the 203 engine When he connected a drive belt he discovered the pulley on it and the one he had put on the engine drive shaft were sized to deliver 400 rpm’s at full engine speed “I knew I needed to reduce the engine rpm’s to what the dryer called for and they matched up perfectly ” says Ristau The biggest problem with using LP is that it has to be warmed in order to vaporize to a gas that will burn To accomplish this hot water from the engine is cycled through the vaporizer This is fine when the engine is hot but for a cold start Ristau needed a source of vapor “I installed a small tank on the frame ahead of the radiator ” he explains “It holds enough vapor for a cold start and to warm the engine ” The tank is piped to the line coming out of the vaporizer It fills with vapor when the engine is operating When Ristau shuts down the engine for the day he shuts off the line to the LP tank and to the propane vapor mini-tank The next morning he turns on the valve to the mini-tank and vapor feeds into the carburetor to start the engine “Once it is warmed up I open the line from the LP tank to the vaporizer and it refills the vapor tank and fuels the engine ” explains Ristau One added caution Ristau took was to beef up the air cleaner with multiple filters “You don’t want any restriction on air intake ” he explains “Sometimes the bees-wings from the corn blows over the engine and could plug up the air cleaner If that happens the engine starts sucking in extra propane and you can have problems ” The bees-wings were one reason Ristau also left the old cowling on the 203 radiator It was designed to keep field chaff and dust out of the radiator and continues to do that job “I’ve run it for 3 years and the engine oil is as clean today as when I put it in ” says Ristau Contact: FARM SHOW Followup Larry Ristau E14484 County Road HH Osseo Wis 54758 ph 715 597-6160; lristau@triwest net

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