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New to me HD11B

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farmerdev View Drop Down
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Joined: 31 Jul 2022
Location: Utah
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    Posted: 31 Jul 2022 at 5:25pm
Recently bought an HD11B will be picking it up in about 2 weeks. They said the engine (685T) is locked up only paid $222 for it so I have some wiggle room in fixing it.  I can get an engine rebuild kit for about $2500 less main bearing set & head gasket set. My question is should I keep with the stock engine or should I go ahead and repower it to a more common engine? I cant seem to find main bearings or head gasket set for this engine. Attached is a picture of the serial number.
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Tracy Martin TN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jul 2022 at 7:46pm
I would investigate what is wrong with engine first. Could be something simple. JMHO, Tracy
No greater gift than healthy grandkids!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JC-WI Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jul 2022 at 8:45pm
See if starter is locked up.
He who says there is no evil has already deceived himself
The truth is the truth, sugar coated or not. Trawler II says, "Remember that."
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC Mel Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jul 2022 at 9:43pm
Tim....So the serial number being 799...should be the first year of production 1955. It would have come with a Lonova style engine at that time...the 685T became the last version made. So ...yes JC and Tracy have good ideas where to look.   As I always like to say....post some pictures....engine pictures will help identify exactly what you have....the more pictures the better.
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farmerdev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farmerdev Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2022 at 5:25pm
Here are some more images of the engine



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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2022 at 6:29pm
Not a 1980's model 685-T for sure !!!!    Non-turbo 1950's engine is what I see.
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AC Mel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC Mel Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2022 at 8:11pm
So...Tim....yes what you have is the early version of the 685.  This is the "Lanova" style Buda engine that was first installed in ACs in 1955. The hydraulics also represent the first year.  Looks like a pretty clean specimen. Maybe put up some more pictures of the whole machine. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CAL(KS) Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2022 at 8:08am
Unfortunately no one is making engine parts for these anymore.  I bit of know-how and luck will be required to find parts on someone's shelf.
Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20

Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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farmerdev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farmerdev Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2022 at 2:21pm
Here is a set a pictures that I have.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CAL(KS) Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2022 at 2:29pm
definitely worth the price but the engine and undercarriage condition will be the determining factors.

Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20

Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Post Options Post Options   Thanks (0) Thanks(0)   Quote R.KYLE Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2022 at 7:54pm
IF YOUR UP FOR A CHALANGE A 471 DETROIT WILL FIT IN THERE. PARTS STILL AVABLE.
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farmerdev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farmerdev Quote  Post ReplyReply Direct Link To This Post Posted: 05 Aug 2022 at 2:27pm
I am up for anything really I do like the idea of a Detroit in there I have a 2-53 I believe in another JD crawler loader and that thing runs great. Just will have to find one I guess I may even just machine my own parts for this motor if I have to.  
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Lee Bradley View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee Bradley Quote  Post ReplyReply Direct Link To This Post Posted: 05 Aug 2022 at 3:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farmerdev Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 12:19pm
That sounds nice. How much HP can I throw at the transmission and clutches before I break stuff?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 2:20pm
The tractor in the you tube is still running as far as I know, about 50 miles from me. The video  has comment 13 year old and he only had 160 acres, so not run everyday. Farming is easier than dozer work because you use more higher gears.

So if you realize what the tractor was made to do and treat it with care, most anything that fits size wise. But remember if you break some parts there are no more at the dealership.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee Bradley Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 3:48pm
Probably not as much power as AC put through them later with the turbo'd engines.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 5:47pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 7:32pm
My 11B tractor was rated at 140hp but according to my buddy at the fuel shop, fuel delivery is increased by 15% over stock settings. Mine is power shift however.

A complete AC 10000 series engine is about 2050 pounds complete. A Detroit Diesel 3-71 is 1521 pounds complete. A Detroit Diesel 4-71 is 1780 pounds complete. Power ratings are easily set where needed with most any of them. A 3-71, or a 4-71 would be a good choice for a repower I'd think. A 3-71 did a fine job in an HD7 tractor so a 4-71 should be a good match for the larger tractor. All would be just a bit more power than the original engine. 

If me I'd work with the original ascertaining what is wrong with it before going further. As mentioned, u/c and other major mechanicals need evaluated before going far.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 8:00pm
Tim welcome to the forum. Is the pictures of the dozer at your property. See other orange in the background 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farmerdev Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2022 at 8:15pm
Thanks for all the information. The pictures of the Dozer are at the property I bought it from. I don't have it picked up yet going out in 2 weeks to get it. If I am unable to get parts for the motor I will probably get a 4-71 Detroit though the 6v-71 is tempting.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote R.KYLE Quote  Post ReplyReply Direct Link To This Post Posted: 07 Aug 2022 at 9:08pm
I PUT A DETROIT 671 IN LINE IN A HD11 LIKE YOURS. IT IS A TIGHT FIT AND REQUIRED SOME MODIFACTIONS. TRACTOR IS OVER POWERED BUT USED WITH CARE WORKS WELL.  I USED THE 671 BECAUSE I HAD A HD14 WITH GOOD ENGINE AND POOR UNDERCARRIAGE.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CAL(KS) Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2022 at 7:10am
would 11B have the early 1/2 bolts on the intermediate pinion cap?  they were a weak point and eventually upgraded to 5/8, so power level considered here.    keep in mind the v series will be more expensive than a 4-71 .  they only ran about 1700 rpm, and a 4-71 will fit easier and definately be cheaper.  I mean you can do whatever you want, i just feel the less complicated the swap is, the more likely it is to be a finished success, and thats what we want is another machine to keep on living.



Edited by CAL(KS) - 08 Aug 2022 at 7:19am
Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20

Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC Mel Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2022 at 10:32am
I concur with Cal....keep in mind the year before this tractor was made it was the model HD9...which had the 471.  There are very few changes in the running gear of this HD11 from the HD9. In the early years it was common for the farmers out here in the Sacramento valley to convert back to the 471 when they had engine problems. The 471 would be the easiest swap....if you found one with a turbo..that would make it sweeter.
  Be careful about trying to turn the engine over. Out of all the things that could be stuck...the PSB fuel pump could be one of the things that's holding it back. You don't want to break that....it is made of unabtainium...yes...been there done that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote R.KYLE Quote  Post ReplyReply Direct Link To This Post Posted: 9 hours 30 minutes ago at 6:37pm
YES THE 471 IS BEST CHOICE I ONLY USED THE 671 BECAUSE I HAD IT AND NEW IT WAS A GOOD ENGINE. ALSO MORE WORK GETTING THE 671 IN THERE.
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