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55allis 
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Joined: 30 Jun 2020
Location: Griswold Iowa
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 Topic: 8550 questions
Posted: 12 Mar 2026 at 9:43pm |
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Good day,
So looking at a 8550 that’s about an hour away that has been sitting for about 6-7 years due to blowing an injection line.
Seller says his son finished 10-15 acres of NH3 before replacing the line but says it still didn’t run right so he parked it in the weeds planning on repairing it but never got to it.
Seller’s pretty sure it has a hole in the piston?
If that’s the case would it be reasonable to only replace that piston and ring set?
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors 
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DrAllis
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Joined: 12 Sep 2009
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Posted: 12 Mar 2026 at 10:29pm |
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Interesting how we go from a leaking injection line (which would leak fuel and could cause a miss-fire) to a hole in a piston ?? Two unrelated problems. It could have been a leaking number one injector line and a failed piston could be number 2 or 3 or 4 or 5 or 6 piston ?? Should have been a ton of blow-by with a failed piston. There are injector lines under the valve covers too.........
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Mike Kroupa
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Joined: 02 Oct 2009
Location: pierce, ne
Points: 344
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Posted: 12 Mar 2026 at 10:56pm |
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I owned and farmed with a 8550 for many years and yes they are notorious for injection line failures. One other possibility is when they replaced the failed line the inj. pump barrel might have moved slightly, causing fuel to bypass and the engine still miss. This happened to me once, removed the one head expecting to find something and everything looked good. Good Luck!
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
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Posted: 12 Mar 2026 at 11:01pm |
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I thought that very interesting too..
Going to look at it possibly Saturday morning if all works out.
Seller drained the engine oil last spring or so to start in on the repair so I wont be able spin it over.
Is there any concerns about being a dry start?
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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DrAllis
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Posted: 12 Mar 2026 at 11:03pm |
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Fill the new engine oil filters with oil before installing and start it at an idle to let the oil pressure build.
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55allis
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Location: Griswold Iowa
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Posted: 12 Mar 2026 at 11:13pm |
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Is there a way to have a custom lines made that has thicker sides walls or bigger line with same fittings?
Never even seen one in person, only photos and videos off the internet so bear with me.
With this being told what’s a good price range to offer?
Paint is crappy (mostly brown) tires aren’t the greatest but do look like they hold air and might last awhile. Cab interior is crap, seat has a hole. Hour meter reads 3644 hours but not sure if it works.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
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Posted: 12 Mar 2026 at 11:17pm |
 DrAllis wrote:
Fill the new engine oil filters with oil before installing and start it at an idle to let the oil pressure build. |
Ok, didn’t know what it would do to a sitting engine. Thanks!!!
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
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Posted: 13 Mar 2026 at 12:06pm |
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Talked to the owner again today and he said it had a lot of blow by to the point of blowing oil out the breather..
Said it didn’t have any before…
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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Unit3
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Joined: 17 Oct 2009
Location: NC Iowa
Points: 5657
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Posted: 13 Mar 2026 at 1:59pm |
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The more I read, I think this engine needs a major overhaul. If one of the diesel lines under the valve cover let loose, you could’ve had Diesel get to the bearings. You could’ve had a valve touch a piston. It sounds like the owner has told you several different things, so it could be anything and everything.
We had diesel in the oil on a 4W305. It turned out that had a bad seal on the injection pump. Every time I turned into the wind, I could smell Diesel. I managed to catch it in time and no damage was done. Sometimes it’s really good to be lucky.🍀🍀🍀🍀🍀
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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SteveM C/IL
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Posted: 13 Mar 2026 at 2:41pm |
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Pursuing one of those sounds as bad as wanting a 45D
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DanWi
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Posted: 13 Mar 2026 at 4:46pm |
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Would the cylinder with the leaking injector line have caused the rings to stick from lack of fuel or poor spray pattern? Just a thought
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55allis
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Posted: Yesterday at 4:40pm |
Looked at it this morning. Guy is asking $11,000 and I think that a little steep, went down $1000 but still think steep, says for any less he’ll fix it and keep it. Wiring is shot, front tires are pretty much bald with cracks. Did manage to get it to crank over with battery but it was out of fuel (he drained it years back). The range shifter cable is very stiff but the rest seem to work fine. 
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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RedHeeler79
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Joined: 09 Sep 2023
Location: NE Kansas
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Posted: Yesterday at 5:18pm |
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Awesome machine for sure, but the cost of repair would surely be very high. Tires alone would be a small fortune. Is this the model that was commonly swapped to an 855 Cummins, or the 4w-305?
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youngorange2000
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Joined: 27 Mar 2019
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Posted: Yesterday at 5:42pm |
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I love that mindset ask 5x the value and plan to fix it someday, sure you do that then.... then several years later it ends up being the next generations problem and has been deteriorating even longer and ends up on a auction going for $125 a ton. The value in that machine is tires x engine x overall condition = ? 8 junk tires $0 junk engine that's a core $1500?? The rest of a machine that hasn't seen inside a building since last century $??? That's a $10,000 boat anchor worth about $125 a ton.
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DrAllis
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Posted: Yesterday at 5:45pm |
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They were 300 HP at the PTO. The ones I've seen turned up to say 400 HP always have the paint burned off the right hood near the turbochargers.
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
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Posted: 20 hours 46 minutes ago at 9:11pm |
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I think it’s cool you wanna save it. Unless you have unlimited funds I’d walk away from it. Always thought they were the best looking 4x4 that AC made. Personally like the narrow cab look versus the newer model. Although the newer model would be more comfortable and roomier. Good luck with whatever you decide to do. I’ve done some dumb things in my life, bought some stuff that I should have walked away from, but I never regretted it. If you want a big project, that’s the one for you. It’s bada$$ in my opinion.
Edited by AC720Man - 19 hours 60 minutes ago at 9:57pm
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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TedN
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Joined: 30 Apr 2025
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Posted: 19 hours 3 minutes ago at 10:54pm |
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I would write up an estimate, get numbers you can look at so you are aware of what the minimum is that you will spend. I would plan on a complete overhaul of the engine, and include tire replacement cost. These are the items you know need to be done. The fuel tank sitting empty for years will probably add another bit of time and effort to the project. When you have your numbers you can calculate a fair offer, and you have your reasons why you make the offer you did. I think if the current owner sees what he can expect to spend to fix it himself the price may get a little more flexible. The other way it may go is after you look at the numbers you may not be as interested.
I noticed that one exhaust is significantly more discolored than the other, probably because one has been replaced recently. But why would they only replace one? Both should be in about the same shape, theoretically have had the same amount of heat and exhaust through them unless there is a cooling system issue and the back runs quite a bit hotter.
Ted
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190XTD seriesIII, 190XTD seriesI, maroon belly 7000, 190XTD series??? project(or maybe parts)
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Daehler
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Posted: 18 hours 35 minutes ago at 11:22pm |
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Another case of ill fix it myself and let it rot even more. Tractors worth 4k. Its a nice one that could be fixed up but. Pistons are hard to come by. I saw it posted on Facebook and thought about it but got a 305 thats more important. Like i said its a savable tractor but they are nuts on the price. I have some spare lines and parts if you did make a deal.
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8070FWA,7080 BlackBelly, 7045,2 200s,D19,D17,G, WD,45,UC,7 AC mowers and lots more!
"IT TAKES 3 JD's TO OUT DO AN ALLIS, 2 TO MATCH IT IN THE FIELD AND 1 FOR PARTS!"
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55allis
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Posted: 17 hours 52 minutes ago at 12:05am |
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No deal right now…
Just seen a 7580 that runs and is decent field condition sell for $7500.
I kinda made a list of everything it would need, not sure on pricing but I know it would have some big bucks into it.
Here’s what I came up with, if you want to add prices for fun you can.
wiring harness
Tires
Cab kit
Possibly a shift cable
Steering hoses (one is cracked in half)
Overhaul kit
Stater solenoid (the battery stud is bad)
Batteries
Fluids
Belts
air conditioner (I’m sure something’s wrong with it sitting)
Possibly 3 point cylinder rebuild and steering cylinder rebuild
I offered $7000 (that was probably dumb) but he wouldn’t budge. He seems to think it’s big hps so get big bucks for it.
I’d love to get one but I’d take a wild guess I’d have at least $20,000 in parts and tires for this one.
Hope this don’t screw up his ad but it’s the truth.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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AC7060IL
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Posted: 17 hours 7 minutes ago at 12:50am |
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55Allis, Seems it’s crazy times in the machine/mechanical industries (auto/truck/ag/excavation/home appliances/etc..)? Some older equipment has been bringing good money, maybe pushing “top dollar?” at auctions. Older simplicity has been gaining value traction versus newer tech that is more costly & can be frustrating when unreliable.
in my opinion & considering all your estimated repairs/costs, the 8550 seller should have accepted your $7500 offer…
It’s spec shipping weight with duals was about 26,400 lbs. So scrap price 13.2 ton @ $125/ton = $1650 ? Anyway guessing a $3000-4000 offer could be considered very good? But $7500 seems awesome? Maybe? Maybe not??
I think you’re fortunate that your offer was refused. And you did right in walking away from it. Imagine you could find much better for your dollars?
Feel like perhaps 8550 seller is trying to recoup some “over spent repair or over priced purchase dollars” on this tractor? If so, that’s his issue not the next owner’s…
Would love to see what it’d bring at auction.
Edited by AC7060IL - 16 hours 51 minutes ago at 1:06am
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wildcat2
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Posted: 9 hours 2 minutes ago at 8:55am |
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Heitman has two of them listed on Tractorhouse. Both look like twins to the one your looking at and the exhaust manifold are a different color on both Is there some reason one would run hotter than the other?
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55allis
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Posted: 8 hours 11 minutes ago at 9:46am |
Everyone smashes the front one… 
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1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
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