Not sure HD9

Almost looks like a 2 stroke Detroit.Those airbox covers on the side?

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

Thanks for the information. i'm going to try and get it. we'll see what happens Danny

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."

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

Edited by Tad Wicks - 31 Aug 2011 at 8:44pm

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

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

[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."

Mactractors HD11s

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!

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Danny NM Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 Dec 2009 Location: New Mexico Points: 69	Post Options Post Reply Quote Danny NM Report Post Thanks(0) Quote Reply Topic: Not sure HD9 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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Freighttrain Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 04 Jul 2011 Location: Gadsden,Al Points: 390	Post Options Post Reply Quote Freighttrain Report Post Thanks(0) Quote Reply Posted: 30 Aug 2011 at 8:51pm
	Almost looks like a 2 stroke Detroit.Those airbox covers on the side?

OrangeKiwi(NZ) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 11 Sep 2009 Location: NEW ZEALAND Points: 444	Post Options Post Reply Quote OrangeKiwi(NZ) Report Post Thanks(0) Quote Reply 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.

q4016lanz Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 23 Jun 2011 Location: australia QLD Points: 1442	Post Options Post Reply Quote q4016lanz Report Post Thanks(0) Quote Reply Posted: 30 Aug 2011 at 9:48pm
	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

Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41609	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 30 Aug 2011 at 9:51pm
	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."

Danny NM Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 Dec 2009 Location: New Mexico Points: 69	Post Options Post Reply Quote Danny NM Report Post Thanks(0) Quote Reply Posted: 30 Aug 2011 at 10:23pm
	Thanks for the information. i'm going to try and get it. we'll see what happens Danny

Mactractor Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 20 Jun 2011 Location: New Zealand Points: 652	Post Options Post Reply Quote Mactractor Report Post Thanks(0) Quote Reply 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

Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41609	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 30 Aug 2011 at 11:21pm
	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."

Mactractor Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 20 Jun 2011 Location: New Zealand Points: 652	Post Options Post Reply Quote Mactractor Report Post Thanks(0) Quote Reply 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

Tad Wicks Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 27 Mar 2011 Location: Shandon, CA Points: 2165	Post Options Post Reply Quote Tad Wicks Report Post Thanks(0) Quote Reply Posted: 31 Aug 2011 at 8:43pm
	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 Edited by Tad Wicks - 31 Aug 2011 at 8:44pm

q4016lanz Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 23 Jun 2011 Location: australia QLD Points: 1442	Post Options Post Reply Quote q4016lanz Report Post Thanks(0) Quote Reply Posted: 31 Aug 2011 at 8:59pm
	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

Mactractor Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 20 Jun 2011 Location: New Zealand Points: 652	Post Options Post Reply Quote Mactractor Report Post Thanks(0) Quote Reply 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

Tad Wicks Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 27 Mar 2011 Location: Shandon, CA Points: 2165	Post Options Post Reply Quote Tad Wicks Report Post Thanks(0) Quote Reply Posted: 01 Sep 2011 at 1:48pm
	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

Mactractor Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 20 Jun 2011 Location: New Zealand Points: 652	Post Options Post Reply Quote Mactractor Report Post Thanks(0) Quote Reply 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

Tad Wicks Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 27 Mar 2011 Location: Shandon, CA Points: 2165	Post Options Post Reply Quote Tad Wicks Report Post Thanks(0) Quote Reply Posted: 01 Sep 2011 at 9:53pm
	Hey guys, here is the link to the HD9 with a "3-71" ????? http://www.youtube.com/watch?v=G50OINq6EEg Edited by Tad Wicks - 01 Sep 2011 at 9:59pm

Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41609	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 01 Sep 2011 at 10:04pm
	[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."

Lee Bradley Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Oct 2009 Location: Kingston, WA Points: 117	Post Options Post Reply Quote Lee Bradley Report Post Thanks(0) Quote Reply 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.

HD6 Merv Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Access Joined: 03 Aug 2010 Location: New Zealand Points: 480	Post Options Post Reply Quote HD6 Merv Report Post Thanks(0) Quote Reply Posted: 04 Sep 2011 at 8:31pm
	Mactractors HD11s

Tad Wicks Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 27 Mar 2011 Location: Shandon, CA Points: 2165	Post Options Post Reply Quote Tad Wicks Report Post Thanks(0) Quote Reply Posted: 04 Sep 2011 at 9:59pm
	Looks as though they are ready to go to work, what's the hold up?????? ( insert smiley face here)Thanks for posting Tad

Mactractor Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 20 Jun 2011 Location: New Zealand Points: 652	Post Options Post Reply Quote Mactractor Report Post Thanks(0) Quote Reply 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!