Is a cool running powerful 426 Possible?

shieldslx13 wrote: Thanks for all the replies.... I hope I offended no one!!!!!  I love Allis, I really do.  To let me also post my case... My brother has an amazing maintenance program. Rot T synthetic every 100 hrs, along with new filters all the way around.  While we have rebuilt pumps and injectors on our own, we do not feel confidant in doing so. Pop pressure is right on the injectors compression is good.  I do understand the foam, although I didn't until I finally stuffed some t-shirts between the radiator and  frame on the 220.  I have since put on the real.  I am asking questions because I am confidant that these can run good. My suspicion is the injector pumps.  Also, when I ordered a cam for my 220, It was the same PN as the 301. The reason he is wanting an IH is the indestructability and power of his 1466 combines.  I was honestly hoping someone would tell me "oh I had those exact same problems and it was ....."  I was thinking about getting an injector pump and injectors off a good running 426 and seeing if that helps.  And we have also done the radiators.  My Dad, before he died, bought an Oliver (Moline) 1355 with the 585 and that thing is an absolute MONSTER.

If you can give it as good as you took it then you'll be alright!


Edited by Lonn - 16 Jan 2019 at 7:19am

An Engineer is caught between the Customer (who wants more for less $$$) and the Sales Dept (who wants things as cheap as possible to make more sales).   If every tractor was equipped with a factory built oversized radiator and cooling system, Customers would always buy one size smaller than they need and "turn it up", knowing full well that the cooling system wasn't going to be an issue.  Kind of like selling a lot of N-5's (and turning them up) versus selling N-6's.  Customer could save several thousand dollars doing it that way.

What does the standard radiator, recored, cost compared to recoring and adding an additional of tubes?

I think you are mistaking this for a JD forum.

Shieldsix13,

What about the oil cooler? Did you clean it out on the overheating tractors?

I've had the experience of cleaning it and making a difference cooling a tractor.

We really would like to help. You can tell by how many people have responded and viewed the post.

I have (4) 426 engines on my farm. Some are better than others, typically the lower the hours the better they are.   But there is mods like putting higher compression pistons and different piston rings with less end gap to improve starting.

There must be a solution because not all tractors/engines have the problem.

No kidding!

I just picked up a 1975 7040 last year and love it so far. Now all this 426 talk has me a little concerned. It has unknown hours but runs cool and smokes very little.

WF owner wrote: A radiator recored and an additional row of tubes for $150 ? I would like the name of the radiator shop that would do that !!!

The difference between a 6 row and 7 row recore was roughly $150 last summer when I had my 8070 recored. Anyone be not willing to do this shouldn’t be pissin n moaning a tractor not staying cool. There are many other factors need to be considered that may also cause tractors to run warm. But for what I do custom baling on hot summer days the extra $150 is money well spent in demanding environments.

Dr Allis we have been round about this before. I don’t understand why you are so against a 7 row of tubes....imo back in the day AC should have had these kids Installled from new. Back in the 80’s when these were new it surly wouldn’t have added more than $75 cost to build an 8070. I I sure as heck wouldn’t have been out buying a tractor strictly by radiator compacity. Ever AC tractor I’ve ever bought was in need of recore. This tells me they may have been undersized from new.

I think mines a 70 model. Don't remember ser# and it's up the road.

DrAllis wrote: An Engineer is caught between the Customer (who wants more for less $$$) and the Sales Dept (who wants things as cheap as possible to make more sales).   If every tractor was equipped with a factory built oversized radiator and cooling system, Customers would always buy one size smaller than they need and "turn it up", knowing full well that the cooling system wasn't going to be an issue.  Kind of like selling a lot of N-5's (and turning them up) versus selling N-6's.  Customer could save several thousand dollars doing it that way.

Kinda why the 220 sales dropped so much after the 210 came out? At least that's what I heard some time ago.

Oh ok we're near Albany

UPDATE: Its been a long time, but I thought you might want an update...I received a call from my brother yesterday and gave me an update on the 7080 that together we put an HX35 (brand new one) on about a month ago.  His words were "today I drove a turbocharged Allis 426 for the first time". He was so excited.  Before this I kid you not, If it was below 2000 rpm it would not pull itself up a hill.  And it has had 2 new turbo's on it (factory).  Before we did this he said if it got no better he was going to sell and just go get an IH.  For history, we have a 436 in an IH combine that will sing at 2700 rpm, start, and has GOBBS of power. Also due to not dumping loads of fuel without burning it, his EGT's were about 400 degrees cooler so it just sat on the thermostat the whole time. I know everyone is going to say the previous factory turbos were bad, but I asure you they were not. He said at 1600 rpm he could walk up a hill with 14lbs of boost!!!!! No black smoke.  I believe the 7060 and 220 will be getting similar turbos.  Also,  I recently purchase a 4.8l 2000 Silverado with a 5 speed, 246k miles and changed the oil after 3k and it looks like it came out of the jug. (just gotta brag to someone who can appreciate old equipment that runs good, harder than you think!) 

Took a bit of modifying, but worth it.  It's like a different tractor.  At 2550 it is a bit stronger, but its got 80 percent more power at 1600

This has certainly been one of the most entertaining threads I've read on here ! What part of KY are you in?