HD 6 Generator or Alternator
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=56905
Printed Date: 20 Jul 2025 at 3:26am
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Topic: HD 6 Generator or Alternator
Posted By: orangeman
Subject: HD 6 Generator or Alternator
Date Posted: 15 Sep 2012 at 3:55pm
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Nice fall day here so am working on the six. Took the generator off to clean - up next to the oil canister: Two questions for you: 1. Are any of you guys running an alternator in place of the generator? If so are you use a Delco or Motorola or other? 2. Anyone have a good NAPA, Baldwin or Purolator number for the oil filter for the block? The engine is an HD 344 block - 1958. Hope you guys are getting some good weather today. Orangeman...
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Replies:
Posted By: Dozer
Date Posted: 15 Sep 2012 at 7:01pm
| Assuming you do NOT have one of the optional oil filters an HD344 motor should take a NAPA 1012 or Wix 5102 or Fram CH8PL The 6000 and 7000 motors take a different filter |
Posted By: Coke-in-MN
Date Posted: 15 Sep 2012 at 7:10pm
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As it is 24V you would have to search some to find a unit. I have used the Delco units on trucks with 24V . you can find them on some older units but are kind of rare . ------------- 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: orangeman
Date Posted: 15 Sep 2012 at 7:21pm
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Hey Dozer and Coke: Great information and thank-you! BTW I see Delco 24 Volt 10 SI Alternators on Ebay at $135. Also noticed some single 24V batteries as well. Might be a good replacement for the old 24V generator. |
Posted By: Mactractor
Date Posted: 16 Sep 2012 at 3:02pm
| You have to choose an alternator that will not snag on the nose cone. On some of my coversions, the one I thought I could use would catch on the dozer nose cone. Then had to go to a more compact unit. As the years have gone by, the amp output of them has increased rapidly, so the compact models now supply ample charge for HD6 even if you run a lot of work lights |
Posted By: orangeman
Date Posted: 16 Sep 2012 at 4:53pm
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Hey Mac: Do you know the name brand of the alternator that is on your 6? This HD6 beast I am working on has not a single light on it. The ones that occupied the top of the radiator cover or nose cone, are gone but the wiring is there. Today I pulled the head, water on top of #1 and # 4, Valves, Pistons and pushrods all look to be in good shape. Vacuumed up all the water off the pistons and clean out the crud. Noticed severe erosion in the combustion chamber on the head at # 1 and # 2. Also bent a few studs pulling the head so will need to replace three of the long studs. Guess I get busy and find a vendor. Engine has flat top pistons. Am guessing this old girl is gonna need rings, and possibly new liners. Next up is to pull the pan and see how the bottom looks. More to come... Orangeman
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Posted By: HD6 Merv
Date Posted: 17 Sep 2012 at 2:11am
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orangeman, would defintly pull liners just to replace liner seal rings. liners may clean up with a 'bunch of grapes' hone and just use new rings. good luck merv ------------- tits tyres and tracks they all cost you money |
Posted By: Mactractor
Date Posted: 17 Sep 2012 at 4:19am
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I used a German made Bosch alternator on a conversion for HD6, probably only about 35 amp but does the job. That was after having the nice big 55 amp Delco that came on a military Chevy diesel rebuilt at an auto electrical shop at considerable expense, only to find it would not comfortably fit inside the nose cone allowing for belt stretch and adjustments. It can be used on my HD11 tractors which have much more room in the nose. The alternators made these days have much more output. A compact one like my little Bosch can do up around 100 amp |
Posted By: Ian Beale
Date Posted: 18 Sep 2012 at 6:47pm
 FWIW
I fitted a Bosch 24 volt 55 amp alternator to our 45 grader. It is a single leg alternator and I welded the adapter to a generator mount from a HD 11 and used the Allis adjusting strap.
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Posted By: orangeman
Date Posted: 19 Sep 2012 at 5:14pm
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Hi Ian, MacTractor, HD6 Merv: Good to hear from you guys, I always liked the bosch equipment. I can see how the 24V alternator would be a good set up. Thank-you for posting your insights, much appreciated!!! I heard that Dozer is moving dirt with his 6's. Allis sure did make a nice machine. Fall coming here in the North Country of New York, sure is nice weather to work on the Allis's. Take care guys...Orangeman
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Posted By: Ian Beale
Date Posted: 20 Sep 2012 at 6:23pm
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Orangeman,
Off thread, but I've had no feedback on injector nozzles.
Another bloke talked about being able to use bigger nozzles at lower presure or smaller at higher if I remember it straight.
We had a lot of small HP diesel industrial engines here (a lot from UK but some home-grown) with either Bosch or CAV gear and he mentioned trying England - no contacts though.
Price of fuel probably had a lot to do with these engines being so common. In 1922 petrol was 35c/(Imp) gallon,kerosene 22c and crude oil 6c.
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Posted By: Ian Beale
Date Posted: 26 Sep 2012 at 3:01am
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Orangeman,
I forgot to mention that, if you are lucky, the pulley from your generator might go straight on the alternator. No key, so you might need a bit of locktite.
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Posted By: flyingfreeman
Date Posted: 05 Jun 2015 at 9:06pm
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I have an HD6-B, and just replaced my generator with a Prestolite 8MR3188K (also listed under 110-557 ) 24 volt 55 Amp, internal regulator, self excite alternator. I will have to slightly modify my mount to align the pulley perfectly (the pulley that I used sets the belt approximately 1/4 inch too far forward). You'll need to order a pulley for the alternator, and I used one that will overdrive the alternator for excellent charging at idle-- 7940-7100 is the part number. I purchased the alternator from EMS Global, and the pulley from SmithCo Electric. Both are on Ebay and provided excellent service. One issue is the alternator pivot bolt is 1/2, and my generator mount used a 3/8 bolt. I may purchase a bushing to slip over the bolt, but I've installed it this way for now, and it appears to fit well enough. As for the wiring, you only need to connect 1 wire from the battery (I ran a wire to the starter hot lead) to the + terminal on the alternator, and 1 wire from ground to GND terminal on the alternator. When the alternator is spinning (at engine idle and above), the alternator begins making power (thanks to self excite function). My belts are new, and it seems that I have plenty of adjustment as the belt stretches. The shaft could stand to be a bit longer, but I'm satisfied with the pulley, The threads didn't extend completely through the pulley, but I feel it's good enough. I used thread locker, and tightened it with a 1/2" breaker bar holding the shaft with an allen and a 15" Crescent holding the nut. It's pretty tight (probably 120 ft pounds, but I didn't use a lock washer so I could engage more threads). Hopefully, this will help someone. I spent quite a bit of time researching this, and feel lucky to have discovered these parts. Alternator http://www.prestolite.com/pgs_products/specs.php?item_detail_id=19890&item=8MR3188K# Pulley http://smithcoelectric.com/7940-7100-new-pulley-for-delco-7940-7100 Product list http://www.prestolite.com/pgs_products/alt_results.php?c_amps=&item_application_value=&item_mount_value=&item_series_id= |