Not sure HD9
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=36434
Printed Date: 25 Jun 2024 at 10:07pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Not sure HD9
Posted By: Danny NM
Subject: Not sure HD9
Date Posted: 30 Aug 2011 at 8:08pm
Helllo everyone Found this about 100 miles from my place. it is for sale and a freind of mine got this picture for me. was wondering what is it and the engine. suposed to run with a head problem. thanks all Danny
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Replies:
Posted By: Freighttrain
Date Posted: 30 Aug 2011 at 8:51pm
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Almost looks like a 2 stroke Detroit.Those airbox covers on the side? |
Posted By: OrangeKiwi(NZ)
Date Posted: 30 Aug 2011 at 9:39pm
| The crawler is an AC HD9 which has a 4/71 GM engine producing 68 drawbar hp. When tested at Nebraska it pulled 95% of its weight. The HD9 was produced from 1950 to 1955. |
Posted By: q4016lanz
Date Posted: 30 Aug 2011 at 9:48pm
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My neighbour has a HD9 same as that ------------- 15 allis chalmers tractors 9 lanz bulldog tractors 2 water cooled deutz 9 john deeres tractors 14 Aus made orange chamberlains I spent most of my money on old tractors I wasted the rest |
Posted By: Coke-in-MN
Date Posted: 30 Aug 2011 at 9:51pm
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The 4-71 should put out a lot more HP that that 3-71 would be rated close to 70 HP and the HD5, 2-71 had 48 HP .. Thats the first thing I noticed was the air box covers on side of engine.
Head work on those isnt that bad as all the parts interchange across the 71 series engines as do internals of pistons sleeves, bearings and such . valves are inexpensive and injectors are easily rebuilt. ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Danny NM
Date Posted: 30 Aug 2011 at 10:23pm
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Thanks for the information. i'm going to try and get it. we'll see what happens Danny |
Posted By: Mactractor
Date Posted: 30 Aug 2011 at 10:24pm
| Drawbar HP in a crawler takes a dramatic dive from its engine HP Coke. If you replaced the low block Jimmy in HD9 with a 471N you can really boost that power up though |
Posted By: Coke-in-MN
Date Posted: 30 Aug 2011 at 11:21pm
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Friend had single axle GMC with 4-71 that he ran from here to Chicago 3 times a week . Pulling 44,000 loads , had RPM turned up some and know the HP on that was a lot more ,
Unsure of the high or low block design .I know when i rebuilt my 2-71 I used the T pistons and liners he had bought for the spare engine he was going to rebuild. ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Mactractor
Date Posted: 30 Aug 2011 at 11:41pm
| The low blocks were the first 71 engines with no optional power ratings. The N series 71s gave all the optional ratings with different injector sizes and fuel timing settings. One guy told me N injectors wont go in the low blocks. Another told me they will. I would be happy for any knowledgable Jimmy mechanic to set me straight on that one |
Posted By: Tad Wicks
Date Posted: 31 Aug 2011 at 8:43pm
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The HD9 should not have the low block engine, the HD10 did, but may be the very first production 9's came with the low block 4-71's. There is an HD9 on Youtube claiming to have a 3-71, I can't tell from the video, but if is a 3-71 that is something unusual. Heads will interchange between low and tall blocks, the older low block head is usually only 2 valve and the fuel rails are on the outside vs 4 valve and cast in rails in the later. It is easy to tell a low block from a tall block by looking above the blower, towards the fan, where the head and block part and see if there is a head gasket between them, if there is a gasket it's a low block, if the head is off and there is no machined channel around the deck and liners, it is a low block. The "N" is based on the 4 valve head and large port sleeves and cross head pistons. The HD9 is a great tractor, well balanced for farming, and for pushing, it could use power steering. With the tranny the way it is, you can back up faster than forward and if you put "N" 75 injectors and turn it up to 2100 you will be doing well over 100HP, turbo it and it will be close to 130HP or more, literally a screamer. That is the beauty of a Detroit, more fuel, air and RPM's means more HP. Tad |
Posted By: q4016lanz
Date Posted: 31 Aug 2011 at 8:59pm
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Hi guys the hd9 and 10 both have 4.71gm motors the 9 79hp and the 10 98hp and the big air tube is the exhaust ------------- 15 allis chalmers tractors 9 lanz bulldog tractors 2 water cooled deutz 9 john deeres tractors 14 Aus made orange chamberlains I spent most of my money on old tractors I wasted the rest |
Posted By: Mactractor
Date Posted: 01 Sep 2011 at 1:00am
| Thankyou for the info on 71 Jimmys Tad. One of my team is an early 11B which apart from the Buda, would be the same as a 9. She has had a hell of life but even after running my 11EP, I still enjoy running the ol girl. Every thing on her is so worn, ya gotta have a sense of humour though. A photo of the two tractors side by side was posted on this site a while back by member HD6 Merv. Thanks again Tad |
Posted By: Tad Wicks
Date Posted: 01 Sep 2011 at 1:48pm
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Mactractor, since you have 11's, this should make your day http://www.allischalmers.com/new/forum/forum_posts.asp?TID=28788&title=hd11-repower |
Posted By: Mactractor
Date Posted: 01 Sep 2011 at 3:23pm
| I had heard about your tractor Tad, but was not visiting this site back then and missed veiwing it. Thankyou for the link. You have done an awesome job. I love all Allis crawlers. Hot rodding them is even more fun. Great work |
Posted By: Tad Wicks
Date Posted: 01 Sep 2011 at 9:53pm
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Hey guys, here is the link to the HD9 with a "3-71" ????? http://www.youtube.com/watch?v=G50OINq6EEg |
Posted By: Coke-in-MN
Date Posted: 01 Sep 2011 at 10:04pm
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[TUBE]G50OINq6EEg[/TUBE] ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Lee Bradley
Date Posted: 02 Sep 2011 at 1:35pm
| I think that is a 4-71. The regulator bracket is covering the number one air box cover also look at the muffler mounting it has five mounting studs; three reseced (sp) and one on each end for five studs. A stud on each end of each exhaust port makes four ports. |
Posted By: HD6 Merv
Date Posted: 04 Sep 2011 at 8:31pm
Mactractors HD11s 
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Posted By: Tad Wicks
Date Posted: 04 Sep 2011 at 9:59pm
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Looks as though they are ready to go to work, what's the hold up?????? ( insert smiley face here)Thanks for posting Tad |
Posted By: Mactractor
Date Posted: 05 Sep 2011 at 7:34pm
| Photo was taken about five years ago Tad. The EP had a rebuild since, and has done a lot of work. The old B has done small jobs, but seems to like the idea of retirement. I have a series B 11 that needs some major rebuilding before going to work. Plenty of work to do on all my tractors. If I live long enough to get em all running, I`ll be doin well! |