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West Central Minnesota | This thread is already on page 2, so I am restarting the thread.
There seems to be some confusion and maybe misinformation regarding what MM engines will fit in which tractors. G1000 tractors are made in two versions.... a row crop version which uses a small bellhousing engine and transmission and a standard (wheatland) version with a large bellhousing engine and transmission. For all practical purposes most HD800's were large bell engines. The only small bell engines made were intended for tractor use. Your chances of finding one of these small bell HD800's is slim to none. Here is a brief explanation that some of us put together to help eliminate some confusion.
Minneapolis Moline made motors with three different bolt patterns on the back of the motors. The R, Z, 335, 445, 4-star, and U302 all had a pattern that is about the same size. (small size pattern) The U, G (4-cylinder LP and gas), 5-star, M5, 602, 670, 283 and 403 power units have a common pattern. Let's call this the medium size pattern. The G-1000, G-900, Vista, and the AT-1600 also have the medium size pattern. All 6 cylinder power units (425, 504, 605, 800, & HD800) have a big size pattern. The GB diesel, GVI, 705, 706, 707, and 708 also have the big pattern. They did make a few HD800 motors with the Medium size pattern, but these were in the AT-1600 and sold as a power-up kit for the G-1000 or G-1350.
So, a 605 or 800 power unit will bolt in a 705 without a lot of work. It will not bolt into a G-1000. A 504 motor from a G-1000 will bolt to a U transmission but a 504 from a 705 will not bolt to the U transmission. The crankshaft from a 605 power unit will fit in a G-1000 504 crankcase. A lot of engine components from one engine will fit on others in their respective familys. Think of it as playing with a box of legos.
All six cylinder engines discussed here did only have four main bearings. I have never seen that as a problem on spark ignition engines, probably because of the massive size of the crankshafts and bearings themselves. We farmed for several years with MM tractors, both spark and diesel. We never cracked a head. In all honesty, heads were a weak point on them for those who did not keep coolant at the proper level and failed to warm up or cool down their engines. I was never real impressed with MM diesels. Low compression from the factory for one thing and they used an existing design to make a diesel when maybe they should have started from scratch when they started making and selling diesels. | |
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LP gas tractors of old
