HD6 344 Conversion to 7000
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=72212
Printed Date: 03 Nov 2025 at 11:57pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: HD6 344 Conversion to 7000
Posted By: mahto48
Subject: HD6 344 Conversion to 7000
Date Posted: 21 Jun 2013 at 12:03pm
| Well I am about finished changing my HD6 344 to a 7000 engine. Once I am up and running I will post on the problems I ran in to and the sulutions for anyone who might want to do this conversion. I am concerned about running the old oil bath air filter with this turbo charged system. Does anyone have information on this subject? |
Replies:
Posted By: Mactractor
Date Posted: 21 Jun 2013 at 8:01pm
| First thing I thought of when contemplating the repower was air consumption. Have not seen an HD6AG with 7000 to know what air filtration they used, but dry cleaners on 6000 powered HD6 have nowhere near enough capacity. I bought a much bigger Donaldson assembly to adapt (9"). Donaldsons parts books show air consumption for most American built engines |
Posted By: Ian Beale
Date Posted: 22 Jun 2013 at 3:01am
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MacT
The Donaldson list I saw did it by cubic inches displacement
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Posted By: mahto48
Date Posted: 22 Jun 2013 at 12:02pm
From what I can glean from Donaldson web site the 7000 motor moves 300 cfm. The 6000 moves 218 cfm. The D344 cid motor only moves 143 cfm. Looks like I better build a better air filter than the old oil bath on the HD344  . Thanks for the input and any futher suggestion on this subject.
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Posted By: Silencer223
Date Posted: 01 Sep 2015 at 11:52pm
| How did this work for you. |
Posted By: orangeman
Date Posted: 02 Sep 2015 at 4:43am
| Mahto 48 - Excellent topic - looking forward to your analysis of the changeover. |
Posted By: Ian Beale
Date Posted: 02 Sep 2015 at 5:12am
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Mahto 48 Sounds to me that something is not right in your engine breathing calculations - or I'm up the proverbial creek Presumably (afik) they're all 344 cid? So at 1800 rpm (I'm punting from 516 experience here) it will be breathing 344 x 1800 x .5 ( as 4 stroke) ci/min = 180 cfm So how do the 6000 and 7000 ones get to 218 and 300 cfm? Mind you I'm all for bigger aircleaners - particularly with the dust we get in our part of Oz. A friend used to fit whatever he got with a big Donaldson ahead of whatever was standard with a telltale stud in the intake tract with a dob of grease to show any dust. |
Posted By: DiyDave
Date Posted: 02 Sep 2015 at 5:52pm
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Posted By: ac_sd
Date Posted: 02 Sep 2015 at 7:24pm
| I'm sure you are correct in your concerns, the old oil bath almost certainly won't handle the air flow with the turbo'd 7000 engine ! If you could get the system off an HD-7G that would likely be ideal or a modified newer dry cartridge capable of the required air flow! |
Posted By: split
Date Posted: 19 Feb 2016 at 3:15pm
Any update? |
mahto48 wrote:Posted By: Silencer223
Date Posted: 26 Feb 2016 at 1:08pm
| My HD6G is running AWSOME with the 7000 engine. I found a big double filter air cleader assy. off a Broce broom for 20 bucks at the local tractor salvage yard. I mounted it between the hydro tank and the loader arm and piped 3.0 in pipimg down through the hood to the turbo. The filter intake is 4.0 so I mounted a Cat precleaner on it. Its a powerfull setup. |
Posted By: split
Date Posted: 26 Feb 2016 at 1:13pm
| Do you have any pictures of the conversion? |
Posted By: Silencer223
Date Posted: 07 Mar 2016 at 4:42pm
| Reposting smaller pics. |
Posted By: Silencer223
Date Posted: 07 Mar 2016 at 4:45pm
| Sorry, pictures came out a little large. I can stuff a big block in a lawn mower but cant use a computer very well. |
Posted By: Silencer223
Date Posted: 07 Mar 2016 at 5:09pm
Try these pictures.  
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Posted By: Silencer223
Date Posted: 07 Mar 2016 at 5:14pm
Just one more of the beauty queen. Im proud of her as you can tell. She just needs a little lipstick now.
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Posted By: LeonR2013
Date Posted: 03 Apr 2016 at 8:06am
| I once went with a much larger dry filter on a road tractor and it made a big difference. No doubt more is better. Less makes the exhaust temp. higher, not good. If you have a truck salvage close to you, why not go there and pick up a large canister. From looking at the one in the previous post it looks like there is a convenient spot to mount it. You're on the right track and you'll be happy as a clam when you beat the system. Leon R Cmo |
Posted By: LeonR2013
Date Posted: 03 Apr 2016 at 8:15am
| Silencer, you've done a good job there and you have the right to be proud. It sure looks good to me. I just wish I wasn't too old to do these things again. Well maybe not too old(75) this summer, just pretty well broke down. But I can still dream can't I? Leon R Cmo |
Posted By: orangeman
Date Posted: 03 Apr 2016 at 8:58am
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Air Filter up high out of the dust zone, nice selection for the air cleaner and nice location. Keep up the good work. Would be great to see a video of it running!!! Thanks - Orangeman
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