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Les Kerf 
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Joined: 08 May 2020
Location: Idaho
Points: 792
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 Topic: OEM 8 Volt Power Unit?
Posted: 05 May 2024 at 10:12pm |
While perusing my digital copy of the parts catalog that covers the WD/45 and W226 Power Unit I noticed on Page 164 & 165 that the battery is specified as 8 Volt 15 Plate. This is for W226 Power Unit Eff. W/PU S/N 96714. The earlier units specified a 6 Volt battery, and all of the gasoline tractors also specified 6 Volts.
The 8 Volt Power unit calls out a different starter than the earlier 6 Volt units, but the generator and regulator part numbers are the same on both 6 Volt and 8 Volt models.
Apparently Allis-Chalmers saw a need for some reason.
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Codger
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Joined: 23 Dec 2020
Location: Utopia
Points: 2041
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Posted: 06 May 2024 at 5:33am |
Used to be, (and still are) a few A-C pumps around here in livestock and berry/orchard operations running 8VDC batteries. I asked once years ago why the 8VDC instead of 12VDC and was told for additional starting power in cold weather operation without modifications. Conversation never went further than that.
With modern battery technology as it is today, the 8VDC starting battery is antiquated; just as is the s/p starting system on heavy trucks.
Edited by Codger - 06 May 2024 at 6:22am
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SteveMaskey(MO)
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Joined: 11 Sep 2009
Location: Wellsville, MO
Points: 597
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Posted: 06 May 2024 at 6:06am |
Used to run 8 volt batterys in all of the
WC, WD and 45 tractors for better starting in cold weather and because when
overhauled always put M&W high compression 1/8 over piston sleeve sets
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 4671
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Posted: 06 May 2024 at 6:06am |
There was an old local mechanic (that died many years ago) that was a big advocate of replacing 6-volt batteries with 8-volt, when the battery needed replacing. As a result, there were a lot of older tractors (and I assume cars, but I really don't remember much about 6 volt cars).
His reasoning was that the 8-volt battery would fit in the same battery box and provided a little better starting, with no other alterations.
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4762
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Posted: 06 May 2024 at 6:45am |
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Today's sealed beam headlights used in cars are not very tolerant of a voltage regulator set correctly near at 9volts for a 8volt battery. The replaceable bulbs used in tractors are a little more so. The old hi/low switch will charge a 8volt battery reasonably OK however using a voltage regulator and adjusting it to get a charging voltage of near to 8.75-9 volts is much better. Just my observations from experience. I have used 8volt batteries for decades in older 6 volt things. I currently have 2 tractors with 8volt batteries and 1 old truck, which doesn't get driven after dark.. My old car I switched over to 12 volts after losing a bunch of headlights with the regulator set for 8.75volts.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Les Kerf
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Joined: 08 May 2020
Location: Idaho
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Posted: 06 May 2024 at 9:27am |
I simply found it a bit amusing when I noticed that 8 Volt specification and thought about how when anyone on this forum suggests using an 8 Volt battery there is a wailing and gnashing of teeth about the foolishness and near-blasphemy of desecrating our noble Allis-Chalmers tractors in such an uncouth manner 
Edited by Les Kerf - 06 May 2024 at 9:27am
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KJCHRIS
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Joined: 21 Dec 2015
Location: WC Iowa
Points: 909
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Posted: 06 May 2024 at 5:09pm |
I remember my grandfather doing some 8V batt installs and 12V conversions @ his home shop. He was mechanic/shop foreman @ an AC Dlr from late 1930's until 1970 when he retired. He worked from his home shop after retiring, but only on "friends' " equipment. Using an 8 volt battery in WD & WD45, IHC M & other tractors that were used in winter was common here until early 70's. It was a low-cost method to get more cranking power for on those cold Iowa mornings & they needed to grind feed. I remember some of the regulators needed a little adjustment some didn't. When alternators got popular then it was all 6V pos to 12V neg conversions.
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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,
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