AC 426 engine questions
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=8002
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Topic: AC 426 engine questions
Posted By: Orange Pulling
Subject: AC 426 engine questions
Date Posted: 12 Feb 2010 at 11:29am
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Is there a difference in tractor engine and combine engine internals ? Are the wrist pins bigger ? Is the crankshaft a steel product ? What kind of injector pump was used on a combine 426 engine ? I have heard all 7000 series tractors have a steel crank from the factory, is this true ? How about the connecting rods ? Are all 426,s oil pumps crank driven ? Just a few things Im wondering about, Im slowly building a pulling motor ; another one ; how big of a flywheel [ diameter] does a 426 have in a 7000 series tractor ?
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Replies:
Posted By: ryan(IN)
Date Posted: 12 Feb 2010 at 3:08pm
On the injection pump. the earlier ones were the roosa and the latter ones- maybe 1979 or so(correct me if i'm wrong) went to an American Bosch type pump i belive. hope this helps.
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ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62
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Posted By: smuggler
Date Posted: 12 Feb 2010 at 3:13pm
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some of the combines had a heavier crank in them made in west germany hard to find also had bigger rods and pins. Probaly the engines in the n6. I have taken alot of 426s apart and it seems like a crap shoot what your gonna find inside.
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Posted By: DrAllis
Date Posted: 12 Feb 2010 at 6:02pm
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First generation 426 (3400-3500 series)was in the D21-210-220 and had camshaft driven oil pumps until about 1970 ? and then went to crankshaft driven pumps that were higher volume(and more reliable). "DC" Roosa-Master injection pumps were used. In 1973 the 7030/7050 was the beginning of the Mark II engines(3500-3700 series) with the oil cooler change and oil filters that were upside down (block was cast differently too), improved turbocharger and intercooler (7050),piston cooling jets (7050) and DM-4 Roosa-Master injection pumps. 1975 brought the 7080 (3750 series) which had a counterbalanced crankshaft, tri-metal crankshaft brg shells, viscous front dampner, higher capacity TO-4 turbocharger, larger DM-4 and injectors to match the increased fuel delivery and a cylinder head that was .100" thicker on the deck surface for reliability. Late 1981 combines and tractors got the larger diameter piston pin and three ring pistons (small pins used four rings) and rifile drilled connecting rods for piston cooling and Bosch injectors. In the 1982 model year, combines and tractors got the new American Bosch fuel systems. Not many more changes until the end in 1985. All crankshafts were always steel, with newer higher HP engines having better quality and strength than the older engines. In late 79 or 80 the main brg caps got an increase in material for more strength. D21-210-220's had a 14 inch diameter clutch disc. 7000/8000 series use a "wet" clutch.
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Posted By: JERRY-KS
Date Posted: 12 Feb 2010 at 6:17pm
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The 7000 series had 1 1/2" wrist pins & 4-ring pistons. The engine changed with the "670" series. At that time, the wrist pins became 1 3/4", and the pistons were 3-ring for less friction. The cranks in the 3500 family of engines were Japanese, German, & some other countries as well. Each had a different part #, but were all interchangeable. The 7080 engine being different, as it had the heavy counterbalance crank, etc. & was called 3750 I believe. The 7060 engine was called 3700 I believe. The 670 family were also from several different countries, but the German ones seemed to last the best in our area, The 670 HI units had a heavier counterbalance set-up on it & that crank weighed about 75# more than the lighter ones. They were used in 8050, 8070, N-6 combines & possibly others. It would interchange with the 670 series crank with smaller counterbalance sizewise,should be a bit stronger. It also had the viscous front dampener . The blocks changed from 3500 in D-21, 210 & 220, & to the 670 in 7000 series, in that the outside had various bossed areas & bolt holes moved, etc. Some had water outlets in middle of block for water filter lines (8050, 8070, later N-6), while others had only the front & rear ports. The oil coolers changed dramatically, as did the oil filter blocks. Water pumps & water flow changed, especially on "intercooled" engines. Cylinder heads looked like older models, but in later years they all received thicker iron above compression chambers, new casting #'s, & thus became a few pounds heavier. Early 3500 flywheels had 4 bolts & 2 dowell pins. Later ones had 6 bolts. Pins could be removed from early ones, drilled out holes & tap threads & make work as 6 bolt units. Sorry for the long post, but there are a few more refinements, but these are what I can recall just now. The 3500 series received a crank driven oil pump with the 7000 series tractors as well
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Posted By: 7060
Date Posted: 12 Feb 2010 at 6:57pm
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The 7060 I run now has allis injectors, and I think its a 76. The old 7060 I had which is now for parts had a bosch injectors. I dont know what year it is.
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Posted By: DrAllis
Date Posted: 12 Feb 2010 at 7:08pm
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Bosch injectors didn't happen until late 1980, but, there were customers who bought the conversion kits for older tractors.
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Posted By: Mike Kroupa
Date Posted: 12 Feb 2010 at 7:14pm
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After the energy crisis black smoke from diesel engines became unpopular and A-C addressed this with the Bosch nozzles, this cleaned up the smoke a little and also increased reliability. At one time you could by a kit with all new lines and nozzles to update an engine. I've always wondered why certain parts of the engines were made oversea's when they had their own plant. If I remember my 6120 crank had France stamped on it. Nice job on the timeline Doc, Jerry. , Mike
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Posted By: 7060
Date Posted: 12 Feb 2010 at 8:07pm
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I would say thats what the previous owner had done then. I blew a injector line with the allis injectors and thought I could just put a line on off that tractor but the lines were routed alot different. I was just told that it had the bosch injectors.
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Posted By: JERRY-KS
Date Posted: 13 Feb 2010 at 8:31am
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An easy way to tell which nozzles you have is the Allis (Roosa) nozzles had fuel lines enter in the side of it & the Bosch lines came in from the top. The Bosch nozzles were less tolerant of contaminated fuel, varnished fuel, etc. They were also much more difficult to adjust pop pressure, because they had to be split for each adjustment & shims were used. Whereas the Roosa Allis nozzle was a simple adjustment od the wrench. The Roosa units haf "return" fuel line on tops of them, & Bosch return was on side of upper shank.
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Posted By: injpumpEd
Date Posted: 13 Feb 2010 at 12:55pm
Allis built the early style, only the injection pump was stanadyne(roosa). Roosa pumps were still used with the bosch/american bosch bar-stock injectors though.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: rmdiesel91
Date Posted: 06 Jul 2010 at 7:39pm
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Has anyone put a 426 in a 185? I have a 185 with shot sleeves and I talked to our local machine shop who said they have heard of these 426 motors replacing 301s. I really want to do this. Just wondering if anyone on here has done it.
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Posted By: DrAllis
Date Posted: 06 Jul 2010 at 7:55pm
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Shows how very little your machine shop knows farm equipment doesn't it???
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Posted By: rmdiesel91
Date Posted: 06 Jul 2010 at 10:17pm
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This is one of the best machine shops in the area.
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Posted By: rmdiesel91
Date Posted: 06 Jul 2010 at 10:18pm
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They are not saying it is a common practice. They have heard of it being done. I am asking if anyone on here has done it and if so can i get some info?
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