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Onan ring gear source?


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  #1  
Old 10-22-2014, 02:16:44 PM
67CarNut 67CarNut is offline
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Question Onan ring gear source?

Hi all,

I'm trying to find a source for a new ring gear for an Onan gen-set. Here are the particulars:
Model: 25HN-3R/A
Serial: 46.285086


As I decode the manufacturer's plate, this generator puts out 25,000 watts, 120/240 Volt, single phase, 3 wire, remote start.

It's connected to a 6-cyl Continental, and lives in the back of a 1949 Mack Flood Light Wagon, originally used by the Baltimore Fire Dept. to light up night time fire scenes. The engine/generator are original to the vehicle, so that helps me to date it.

We've removed the ring gear, and found considerable wear on the teeth (103 teeth, 13" o.d.). While I understand that we can flip the ring gear over (potentially) to use the other side, we'd rather find a replacement, if possible. We did find this stamped on the side of the ring gear: "8FC3C4" There may be an additional number stamped, but it is unreadable at the moment. We will do some light sanding to see if we can decipher it fully.

The only ring gear sources for Onan generators that I've found are for newer models. For that matter, I have yet to decipher the "HN" in the model. Any thoughts on the HN series?

Thanks for any help you can provide! I'll post some pics when I get the chance.
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  #2  
Old 10-22-2014, 03:43:30 PM
Kevin K Kevin K is offline
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Default Re: Onan ring gear source?

Your Spec A 25Kw HN generator was built in April, 1946.

Serial: 46.285086

4 month April
6 Year
. decade = 1940's

Post an email address and I can send you the instruction manual, Onan part # 905-0002.
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Old 10-22-2014, 04:18:59 PM
grif grif is offline
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Default Re: Onan ring gear source?

Quote:
Originally Posted by 67CarNut View Post
Hi all,

I'm trying to find a source for a new ring gear for an Onan gen-set. Here are the particulars:
Model: 25HN-3R/A
Serial: 46.285086

There may be an additional number stamped, but it is unreadable at the moment. We will do some light sanding to see if we can decipher it fully.

.
Easy on the sanding,,, Try google to see about acid etching/cleaning? In my mind, one of those processes will bring up a contrast difference between the compressed metal that was under the stamp, and the unstamped part of the letter.

Also, see of there is any chance the engine was used in the agricultural world.

If that's an F226 engine, it shows up in a bunch of old ag stuff. And much like us Onan folks,,, it's all about keeping them running and finding parts.

Combines: 25, 33, 35, 40 Oliver; Crawlers: AG6 Oliver; Forklifts & Power Units;
Tractors: 101 Senior, 44-6 Massey Harris;

Didn't find a ring gear, but lots of hits in google, I'll bet it's just a matter of a half dozen phone calls.

I've talked with Steiner and some of the other antique tractor folks with good results.

http://antique-tractor-parts.steiner...m/tractor/F226

http://continentalengineparts.net/im...Parts_List.pdf
http://www.agkits.com/continental-f2...x#.VEgQwBaxVEc
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Old 10-22-2014, 04:30:32 PM
Kevin K Kevin K is offline
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Default Re: Onan ring gear source?

The HN owners manual indicates the engine used for the 25Kw HN model is a Continental F226 Specification 401.

Bore 3-5/16"
Stroke 4-3/8"
Compression Ratio 6 to 1

If it is used in Ag equipment, you are in luck. There should be plenty of parts around.
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Old 10-22-2014, 11:16:58 PM
Doug Reed Doug Reed is offline
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Default Re: Onan ring gear source?

I've only seen one manual for the HN and HK series gensets spec A-K. That is the 905-0002 manual that Kevin mentioned. You can download the manual by clicking this link.
http://www.twinslan.net/~n0nas/manua...)%20insert.pdf

Since this is an industrial engine that Onan bought from another manufacturer, you will have to Google search for "Continental F226 Specification 401 engine service manual" and see what you can find. But as Kevin said, it was probably used a thousands of pieces of equipment over the years so replacement parts might not be a big problem. Good luck!
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Old 10-23-2014, 09:31:48 AM
67CarNut 67CarNut is offline
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Default Re: Onan ring gear source?

Thanks for the suggestions so far, all. Greatly appreciated!

We've already rebuilt the engine (Continental F226, as previously mentioned) and are now working on the windings, armatures, etc of the Onan. As far as I know this combination was installed in this vehicle by Mack Trucks prior to initial delivery.

I'll run down the various links you all have provided and see what I can dig up. Thanks again!
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Old 10-23-2014, 01:16:57 PM
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Mikey4026 Mikey4026 is offline
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Default Re: Onan ring gear source?

Don't be hesitant to flip the ring gear over and reinstall it.
I have done it many times and works perfectly even if the ring gear teeth are not tapered on the starter drive side.
In many cases they will actually hold up better, don't ask me why as I have no idea.
I was shown that trick by an old timer on an engine that was always tearing up ring gears and starter drives, never had another problem with it after that.
Regards
Mike
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Old 10-23-2014, 01:29:21 PM
grif grif is offline
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Default Re: Onan ring gear source?

Random thought. On older MF tractors (Continental Z134 engines), out of time or point issues on engines will totally kill a starter Bendix drive and also bust the end bell of the starter. Can't be good for the ring gear.

Had it happen more than once over the years. It's like the engine kicks back, throws the bendix out of mesh, the starter is still under power, it slams back in to the ring gear and presto. Stuff breaks. No idea if the same failure happens with solenoid and fork engagement vs the inertial Bendix.

Last edited by grif; 10-23-2014 at 01:30:05 PM. Reason: engine brand
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Old 10-23-2014, 05:09:14 PM
67CarNut 67CarNut is offline
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Default Re: Onan ring gear source?

So it would appear that I've been mistaken; I'm actually getting a Continental ring gear, not an Onan. While the two are connected in their cradle, the ring gear goes on the engine, not the gen-set.

Nevertheless, I was helped by another friend who suggested Vintage Auto Parts (www.vapinc.com); they have quite the selection of ring gears available, so we'll see if they have any success hunting through their warehouse. Also, the suggestion of Steiner looks quite positive, too. It's good to have options!

Thanks again for the help - we'll see what the reports are tomorrow...
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Old 10-23-2014, 05:20:05 PM
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Billy J Shafer Billy J Shafer is online now
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Default Re: Onan ring gear source?

Onan bought engines for most of the larger gensets they sold back then. From the flywheel forward all parts. Belonged to the engine OEM. Onan only added the items they needed to make them generator engines.
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Old 10-23-2014, 05:26:25 PM
pegasuspinto pegasuspinto is offline
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Default Re: Onan ring gear source?

something like this?

http://www.steinertractor.com/ABC478...FeQRMwodTmwAgw

If you measure the exact ID that might help too.
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Old 10-24-2014, 01:51:08 PM
67CarNut 67CarNut is offline
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Smile Re: Onan ring gear source?

Quote:
Originally Posted by pegasuspinto View Post
something like this?

http://www.steinertractor.com/ABC478...FeQRMwodTmwAgw

If you measure the exact ID that might help too.
That looks like the one! We'll be double checking our measurements to make sure, but the price is certainly right and the description matches. Thanks again for all the help - I'll let you all know how things work out.
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Old 10-24-2014, 02:00:18 PM
grif grif is offline
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Default Re: Onan ring gear source?

Quote:
Originally Posted by pegasuspinto View Post
something like this?

http://www.steinertractor.com/ABC478...FeQRMwodTmwAgw

If you measure the exact ID that might help too.
I hope they're as good to OP as they've been to me.
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Old 10-25-2014, 10:44:32 AM
Lloyd H Lloyd H is offline
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Default Re: Onan ring gear source?

For a ring gear heater:
Take the transformer out of a full size microwave and
cut the core apart as in "transformer-core.bmp" then
remove the the secondary coils and the two shunts.
Connect the cord to the primary coil, lay ring in one
core window and place the removed core piece back on.
plug in to 120 Volts and wait till ring gear is as hot
as you want. Don't take long and its heated evenly all
the way around
Attached Images
File Type: bmp transformer-core.bmp (31.1 KB, 17 views)
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Old 10-25-2014, 11:01:39 AM
Doug Reed Doug Reed is offline
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Default Re: Onan ring gear source?

Cute, I wouldn't have thought of that. You strip the excess windings off the old transformer and put it around the ring gear so the gear becomes a shorted turn on the transformer. When you plug it in you get low-voltage high-current in the ring gear and it heats up.
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Old 10-26-2014, 11:26:14 AM
suntreemcanic suntreemcanic is offline
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Default Re: Onan ring gear source?

You can also use an oxygen acetylene torch to heat the ring. Support the ring on three points only so very little of the heat will transfer onto the supports. Have a good pair of gloves on. Heat the ring going round it every five seconds or so. Spit on the ring when it is cold and notice how the spit just sits there. When the ring is at the right temperature for installation, when you spit on it the spit will bounce off. Quickly turn the torch off pick up the ring and slip it over the flywheel into place. It will cool fast, so plan ahead. When heating keep the torch moving, those little teeth can get hot (red) very fast.
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Old 10-26-2014, 03:57:02 PM
GHanners GHanners is offline
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Default Re: Onan ring gear source?

I always waited till the wife was gone and used the oven to heat them

I'll have to try the transformer method
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