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Help HD5G blower rotors shot

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=51249
Printed Date: 29 Jun 2025 at 12:09pm
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Topic: Help HD5G blower rotors shot

Posted By: highrideford
Subject: Help HD5G blower rotors shot
Date Posted: 28 May 2012 at 9:23pm

Nice site here

bought a hd5g with a backhoe for less than scrap price. came with a spare motor but both motors blower rotors are busted from water freezing. was wondering if anyone else has had this problem and wondering if they just got a reman blower or if you can still order the rotors from some place. Have done some searching on just the rotors and im striking out

Thanks

Jeremy

Replies:

Posted By: Coke-in-MN
Date Posted: 28 May 2012 at 10:16pm

I had the same problem on one HD5B I bought and found one lobe at a place in Duluth MN . I had the address and phone number but when look it up a month or so back it's not the right place now.

I have a complete 2-71 that I have out of another machine but know nothing about it except when I bought the 2 machines from guy he had the extra engine as said this one lost oil pressure so he replaced it with a generator 2-71

I want $500 for the full engine . What I paid to have a new head rebuilt for mine.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: gemdozer
Date Posted: 29 May 2012 at 11:25am

I have a new bottom rotor blower DETROIT 271 and have 2 used complet blower

Posted By: highrideford
Date Posted: 30 May 2012 at 11:44am

thanks for the help. gemdozer has what i need

thanks again. ill keep that in mind Coke.

Posted By: DMiller
Date Posted: 30 May 2012 at 1:17pm

If you install replacement rotors be careful and mindful that they DO NOT, CAN NOT contact one another. Detroit Blowers run with a narrow but significant clearance rotor to rotor, set with a ribbon gauge and shimming the rotor drive gears, you will need at least those pages out of a 71 series service manual to set them correctly. This is most often after dirt the cause for blower failures.

Posted By: Coke-in-MN
Date Posted: 30 May 2012 at 1:29pm

When I was looking for them the first time , one outfit told me they only sold them in sets and needed both as clearance issues would result if mis-matched sets were used .

Outfit I got the one from told me how to set it up (according to book) for the proper clearance and match.

Lot of information out there but some is not the full story.

Posted By: q4016lanz
Date Posted: 30 May 2012 at 8:22pm

http://www.dieselpro.com/parts-for-detroit-diesel-engine-2-71natural.aspx" rel="nofollow - http://www.dieselpro.com/parts-for-detroit-diesel-engine-2-71natural.aspx

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15 allis chalmers tractors

9 lanz bulldog tractors

2 water cooled deutz

9 john deeres tractors

14 Aus made orange chamberlains

I spent most of my money on old tractors I wasted the rest

Posted By: highrideford
Date Posted: 30 May 2012 at 8:43pm

thanks for the replies. I have a manual i just need to find some feeler ribbon to set and time the rotors.

Posted By: jamzis
Date Posted: 04 Apr 2014 at 7:38pm

Hi, I just rebuilt my 2-71 Detroit Diesel. Ive been searching for blower rotors for a while but cant find any. Do you know where I can find them? I would GREATLY appreciate it.

Posted By: Coke-in-MN
Date Posted: 04 Apr 2014 at 10:32pm

Seems when people plug that drain hole in the bottom of the blower housing - water gets in and there goes a lobe - that is what happened to the HD5B I bought from guy .

He said engine was locked - no engine was free - the lower blower lobe broke from freezing and locked up blower which made engine seem locked.

Posted By: highrideford
Date Posted: 07 Apr 2014 at 10:05am

I ended up getting a used blower from gemdozer here on the forum

Posted By: Coke-in-MN
Date Posted: 07 Apr 2014 at 11:32am

Glad you got the problem solved !

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."