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Allis Chalmers Discussion Forum
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AC engines

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BCnT

10-27-2005 19:31:13




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do all the engines share same bolt pattern on torque tube flange? looking for more modern possible replacements for the 262 diesel.




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Hurst

10-29-2005 06:32:52




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 Re: AC engines in reply to BCnT, 10-27-2005 19:31:13  
Also, another replacement could be a 301 diesel. It will require a little more work, but can be done. You would need the adaptor plate from a 190 or early 190xt (the 190 used the same torque tube and basically rear end as the D19 and the D19 bolted up to the 262 engine. If your D17 is a series 4, then the torque tube will be the same, but the older ones I believe had a different one, but they may have the same bolt pattern. You also may need the frame rails off a 190 too, you would have to measure them out and see if the adaptor plates would bolt to the 17 frame rails or not and then you would also need to make sure that the radiator had enough clearance. Another concern may be overheating. The radiator on the d17 diesels was not the biggest it could have been for the 262, and for a 301 it may be small if you put out any power at all with that motor, as naturally aspirated they could put out quite a bit of power and turboed, well thats another story lol, something like 130 horses without an intercooler is not unheard of. Good luck, I am just trying to give you some options. This combo would require some custom work more than likely and some serious head scratching, but in the end it sure would be a nice combo. Ohh, and if you try the unofficial allis board for parts, it is down right now I think, but may be up later.

Hurst

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Hurst

10-28-2005 07:26:26




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 Re: AC engines in reply to BCnT, 10-27-2005 19:31:13  
What's wrong with the diesel? It may be a lot cheaper to fix it than to replace it and put in a new engine. The easiest possibility will be a 262 gas out of a D19 or a gleaner. Next to that would be to buy the engine and adaptor plate out of a 170 diesel or 175 diesel. It may need the frame rails and the sheet metal too? I forgot if the 170 diesels were the same length as the D17 diesels or if they were the same length as the D17 gassers? Sorry for not being of much help. There have been people who put in perkins into a D17 diesel.

Hurst

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BCnT

10-28-2005 16:54:16




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 Re: AC engines in reply to Hurst, 10-28-2005 07:26:26  
well right now all i know is its leaking compression between 4 & 5 cylinders from hopefully just a blown head gasket...the more i hear about how weak the heads are on this engine the less i want to plop down a cool grand for a reman bare head thats liable to break too...i knew about the gleaner 6 but there doesnt seem to be many of those around this part of Texas...just trying to weigh all options...hopefully i'll win lottery and be able to afford a new tractor that i can work instead of vice versa
thanx

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Hurst

10-29-2005 06:16:19




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 Re: AC engines in reply to BCnT, 10-28-2005 16:54:16  
We had a D17 diesel too and it blew a head gasket only 2 years after having the head and block milled (I believe they were a hair warped) and when it blew the second time, my dad traded her in for a TN 65 newholland. I sure do wish we still had it, it was a series 4 too. There are quite a few people from Texas on the Unofficial allis board, but I am not sure how many will have parts for sale, but they may be able to point you in the right direction. Also, there is a man in OK that works on allis tractors and has a lot of parts. I know how you feel about the head thing. The best advice I can tell you is to get the block checked to make sure it is still level. The head may just need new seats and guides. I would definatively try to get what you have fixed. Also, if you decide to get the head worked on, find a VERY GOOD machine shop that knows about these heads. It is easy for someone to tell you it is no good or mess it up trying to fix it. Another thing that these engines had was a fire ring with the sleeves. It could be that the sleeves may have dropped or that if the motor was ever rebuilt that they didn't set it correctly causing the gasket to blow. I know there are a lot of bad stories about these heads, but think about it, the tractor is maybe 45 years old and that head has been suffering from thousands of explosions a minute for many many years. Eventually they will get little cracks and stuff, so don't be too discouraged by the bad stories. I would have bought our D17 diesel back in a heartbeat for what they gave us for it (2 grand for a series 4, guess what they sold if for after a new gasket lol). Another thing is, use the AGCO gasket or one that is very similar. A lot of aftermarket gaskets won't hold up on those engines. Sorry about the long post. A good reman head should last if it is installed correctly, the block is in good shape and everything else is in specs. Best of luck, they are great tractors and I love the way all those allis 6cyl. diesels sound. Can't beat the way they purr idelin and roar when full throttle under load.

Hurst

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cbp

10-28-2005 05:33:03




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 Re: AC engines in reply to BCnT, 10-27-2005 19:31:13  
They certainly seemed to follow a standard in earlier years with the power crater engines plus B, C, CA, WC (never noticed on the WD) all having the same pattern for 20+ years. I can't say on the actual AC manufactured newer engines but the later Perkins diesels won't mate directly without a serious conversion. For example the 4.236 and 4.248, both used in the AC line, have a bolt pattern more resembling a modern V8 than one of the earlier tractors. It would be interesting to know if some of the early numbered series matched. You might post the measurements on the pattern.

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BCnT

10-28-2005 17:00:28




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 Re: AC engines in reply to cbp, 10-28-2005 05:33:03  
the tractors still together so i dont have a way of measuring it all out accurately...wasnt sure how much things had changed over the years but i guess its like everything else...obsolete.
thanx for info



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