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Author Topic: HG -OC3 magneto choices  (Read 2807 times)
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Demaris
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« on: April 24, 2016, 12:39:50 PM »

My magneto in my Oliver HG keeps crapping out. Takes 2-3 hours of hard use with my HG crawler before it starts losing spark and finally dies. Once it cools off, it works fine again for a few hours. It's been doing this for years but now I am moving it to a very remote location and want it working right. My little HG is a user, not just a collector's item. Has a six-way blade and an aux. trans and is a great little machine for trail work.
Has the Hercules IXB3 engine and has had a mag from an Allis Chalmers on it since I owned it (30 years). Fairbanks Morse FMJ4BA3. I'm pretty sure it has a bad coil. I'd like to get a replacement mag and put it on. Then fix the old one and keep it for back-up.

The most common mag I see for sale is a new Wico XH1113. I also see a few places selling the Wico XH894.

One thing I am wondering. There are brand new military surplus mags for sale made by Slick to go on Continental four-cylinder engines. I am wondering if such a mag would work? Only $100 brand new, old stock. Flange-mount, CW rotation, 5/16" drive-lugs, and 15 degree impulse. My Hercules calls for 20 degrees but I assume it might work anyway? This is a Slick model 56 magneto. Anybody ever tried one? $100 seems like a bargain.
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oliverchris
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« Reply #1 on: April 24, 2016, 11:00:22 PM »

Hey John. Give Steve a call at Mainely Magnetos 207-834-7309
He'll know, or he'll find out, I am sure.
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Specialising in Oliver & Cletrac Crawlers & Parts for HG's, OC-3's & OC-4's from the 30's to the 60's. OC-6 and others from time
1945 Cletrac HG42 + electric snowblade
1952 OC-3-31 sidewalk plow, OC-3-42 + Ware 3-WI (several)
OC-3-42 Heller Universal Trencher
1957 Oliver Super 55, 1958 Oliver 550's Gas/Diesel, 1970's Oliver 1255 FWA
1969 White 2-44 13LL (loader/backhoe)
OC-4 4 cyl. Anderson Dozer, OC-4 Series B 6-way Dozer, OC-46 Series B Loaders
OC-46-A Experimental Crawler Loader
Demaris
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« Reply #2 on: April 25, 2016, 08:54:37 AM »

Hey John. Give Steve a call at Mainely Magnetos 207-834-7309
He'll know, or he'll find out, I am sure.

Thanks.  I saw his Website and he has new Wico mags for $400.  That is pretty much what I find at any mag seller.  I am cheap enough that I hate spending $400 plus shipping on a magneto IF it can be avoided.  The brand-new magnetos made by Slick Aviation look like a bargain for $100 IF they can be made to work on the HG or OC3.   These mags were special made for the military to be used on Continental F162 four-cylinder engines.  Rotation is correct, and so is the mount.  Main issue is the impulse.  These Slick mags are made to be mounted sideways.  When held upright like when mounted on a Hercules engine - the impulse does not work. So I am taking one apart to see if there is an easy way to change it. If so, $100 is a heck of a bargain for a brand-new magneto.  There are still many for sale on Ebay as military surplus.
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Blake Malkamaki
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« Reply #3 on: April 25, 2016, 09:17:19 AM »

If the Slick mag has the same mounting flange and drive, turns the correct way, and has an impulse it should work. If you try one and it works, let us all know as there are always folks looking.

Blake
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My gramps Howard van Driest was Experimental Engineer at Cletrac and Oliver Corporation. After the plant closed, he and my uncle started an excavating business, initially using Cletrac and Oliver Crawler tractors. Please help Support This Site and give your business exposure by buying a business card sized ad.
Jethrow
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« Reply #4 on: April 25, 2016, 09:18:47 AM »

Have you considered converting over to a distributor?  I converted my OC3 to use a Farmall distributor for around $100 and it works great.  Best thing is having options about which coil to use.

Jethrow
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1955 Oliver OC3-42 Ware 3Wi Loader and Aux Trans
oliverchris
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« Reply #5 on: April 25, 2016, 01:10:43 PM »

Hi John. I wasn't suggesting buying a new magneto, I meant ask him your question. He's very helpful and knowledgeable and he's old school in the sense that you don't have to buy something to get advice.
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Specialising in Oliver & Cletrac Crawlers & Parts for HG's, OC-3's & OC-4's from the 30's to the 60's. OC-6 and others from time
1945 Cletrac HG42 + electric snowblade
1952 OC-3-31 sidewalk plow, OC-3-42 + Ware 3-WI (several)
OC-3-42 Heller Universal Trencher
1957 Oliver Super 55, 1958 Oliver 550's Gas/Diesel, 1970's Oliver 1255 FWA
1969 White 2-44 13LL (loader/backhoe)
OC-4 4 cyl. Anderson Dozer, OC-4 Series B 6-way Dozer, OC-46 Series B Loaders
OC-46-A Experimental Crawler Loader
Demaris
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« Reply #6 on: April 26, 2016, 09:41:54 AM »

Update.  I bought one of those new Slick Aviation magnetos.  As I said earlier, mount and rotation is correct. One problem is the impulse only works when it is sitting sideways.  So I took it apart and see now way to make the impulse work when mounted vertically on my Hercules IXB3.  There is an impulse trigger plate with adjustments that go 30 degrees, not at least 90 degrees like I need to mount on my Hercules engine.  The only way to change this thing that I see (without some difficult mods) is to get a different plate from Slick if there IS one.  I did some research on Slick and all I find is doom and gloom.  Used mostly on small aircraft and parts prices are crazy. E.g. a new coil is $400.  A new condensor is $100.  So even if they had a different impulse dog plate - it would likely cost over $200.

So I finally opted to just buy another magneto outright. I've been looking for a used and correct Wico mag for years to rebuild but am now giving up. Note my HG has had a Fairbanks Morse FMJ-4B3 mag on it since I got it (from an Allis Chalmers).  Impulse is a few degrees off but worked OK for many years other then having a bad coil.
I ordered a rebuilt Wico XH1113 from Mainely Magnetos for $325. I also orderd a new coil for my Fairbvanks Morse mag and will fix it and keep as a spare. I am bringing my HG to leave at a remote camp in the Michigan UP and don't want problems up there.  At home - I was okay for using for a hour, then having it sputter and quit, and coming  back later to use again once it cooled off. Now I want it fixed right.

By the way, I have a Wico battery-ignition distributor I was temped to install and convert to battery-ignition. Just more complications though.  A self-powered mag is nice and simple.

I will also note that my Hercules IXB3 has a lot less room around the mag then others.  My engine, at some time, got a new exhaust manifold and it is a Hercules replacement and NOT an Oliver manifold.  It came with an off-set adapter to move the carburetor to the back.  This because the carb mount on the replacement manifold sits a lot lower then the original Oliver manifold did.  Looks very Rube-Goldberg but it came directly from Hercules as a "manifold replacement" kit.  As I recall, with the original Oliver manifold, the carb sits much higher and gives more room to access the magneto.
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Blake Malkamaki
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« Reply #7 on: April 26, 2016, 10:26:07 AM »

Wow, that magneto sure is close to your manifold and carburetor. The WICOs do have shallow caps, so it should give you more clearance. WICO mags are usually pretty easy to find at flea markets at engine shows, but like anything else, when you really need them, they are hard to find. Your F-M mag is probably a better quality than the WICO, but the WICO should be fine.
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My gramps Howard van Driest was Experimental Engineer at Cletrac and Oliver Corporation. After the plant closed, he and my uncle started an excavating business, initially using Cletrac and Oliver Crawler tractors. Please help Support This Site and give your business exposure by buying a business card sized ad.
Jack in NB
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« Reply #8 on: April 27, 2016, 05:40:52 AM »

I've used both the original XH1113 and an FM J4B off an AC B on OC 3's over the years. I had to rotate the mag drive gear a couple of teeth to line up with the FM impulse dogs.

I have a handful of Wico XH carcasses here, acquired over the past 50 years. All need coils, points, rotor, cap etc - they've been robbed to keep my remaining OC 3 running!
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1952 OC 3 6WH994
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