Remember my 1970 XT fan
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=151967
Printed Date: 26 Aug 2025 at 4:54am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Remember my 1970 XT fan
Posted By: captaindana
Subject: Remember my 1970 XT fan
Date Posted: 10 Jul 2018 at 5:08am
Issue? Well I finally was home long enough to tear into it. Hopefully my picture of the fan will post. The fans mfg. date is stamped 3-10-70 and the tractor rolled off the line later that year. The image shows the failed blade AND the 12:00 and 5:00 blades are cracked clear through the rivets. This model has 3500 original hours.  ------------- Blue Skies and Tail Winds Dana |
Replies:
Posted By: captaindana
Date Posted: 10 Jul 2018 at 5:19am
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Oh one more question.....the old fans blades were evenly spaced and the new fans blades are NOT. Why???? ------------- Blue Skies and Tail Winds Dana |
Posted By: Lonn
Date Posted: 10 Jul 2018 at 5:31am
------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
captaindana wrote:Posted By: CrestonM
Date Posted: 10 Jul 2018 at 9:05am
| That's very interesting, Lonn. I didn't know that was the reason. I've seen both kinds and always wondered why there was a difference. |
Posted By: JC-WI
Date Posted: 10 Jul 2018 at 9:15am
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Thanks Captain Dana for sharing your troubles, It might perk the interest of others to give their blades a look to see if they are having failure too and possibly prevent a Radiator disaster happening for them too. The 200 Allis got a 7 blade fan in them. ------------- 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." |
Posted By: Stan R
Date Posted: 10 Jul 2018 at 10:11am
| less harmonic noise = less vibration |
Posted By: AC7060IL
Date Posted: 10 Jul 2018 at 11:20am
| Is this the tractor that it's 301 lost an injector tip into a cylinder? If so, and operator at the that time ran it too long, then wonder if that engine miss could have imbalanced things enough to cause this issue?? But maybe the harmonic crank pulley & fan blade belt would have softened any radical torquing to fan? Just thinking... |
Posted By: Lonn
Date Posted: 10 Jul 2018 at 11:39am
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Look at alternators. The little fan on many of them are not equal all the way around for noise purposes. I never thought of the vibration factor. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: hillmonkey
Date Posted: 10 Jul 2018 at 5:05pm
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blades are off set for easier bolt access thu the one wide space. |
Posted By: Lonn
Date Posted: 10 Jul 2018 at 5:09pm
------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: TramwayGuy
Date Posted: 10 Jul 2018 at 5:43pm
| I agree with Lonn. Making the blades uneven somewhat cancels out frequencies to amplify by generating multiple frequencies that are not a complement of each other. |
Posted By: DanWi
Date Posted: 10 Jul 2018 at 9:40pm
| So how bad did the radiator get skinned? |
Posted By: SteveM C/IL
Date Posted: 10 Jul 2018 at 9:47pm
| my 220 HAS one of those aluminium fans.....got me wondering. ...better have a look see. |
Posted By: Mikez
Date Posted: 10 Jul 2018 at 10:53pm
| Interesting. How long have the tractor |
Posted By: captaindana
Date Posted: 11 Jul 2018 at 5:16am
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Hi guys I put a new fan assembly and radiator in the XT yesterday and headed out to bale 90 of new seeding. It does seem quieter. I will take the dinged 2 year old radiator to the shop and see if it can be repaired. If it can be repaired I'll have to sell it or buy another XT.😆 ------------- Blue Skies and Tail Winds Dana |
Posted By: Lonn
Date Posted: 11 Jul 2018 at 5:25am
  ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: Tbone95
Date Posted: 11 Jul 2018 at 10:40am
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I remember waaaayyy back in the catacombs of knowledge, steel can be designed for very long fatigue life against repetitive load cycling and vibration. You can basically design it to a point that says essentially if it lives this long, it's going to live, until an irregularity or impurity causes a crack. Aluminum there is no such number, you can keep designing it longer, but there's no "plateau" so to speak like there is for steel. Interesting. Admittedly, I don't know how that applies exactly to the situation, but interesting.
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Posted By: Orange Blood
Date Posted: 12 Jul 2018 at 8:42am
I got to ask Cap'n, any good pre-flight would have caught those cracks in the prop, are ya slippin' ?  ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: Ed (Ont)
Date Posted: 13 Jul 2018 at 7:32am
| This may be dumb but I was wondering if some of these aftermarket automotive fan blades would work as replacements. Stainless steel blades- come with different numbers of blades and you can choose different diameters. They sure move a lot of air at low rpm. They flatten out at higher rpm which would be insignificant on tractor application. Any thoughts??? |
Posted By: Lonn
Date Posted: 13 Jul 2018 at 7:49am
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Isn't stainless steel a little brittle if you are trying to find a fan that won't crack apart? ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: Ed (Ont)
Date Posted: 13 Jul 2018 at 8:03am
| Don't know the answer to that Lonn. I do know they work extremely well on the hot rod stuff. Some of them are good to 10,000 rpm. I've not seen an issue with them - yet. LOL |