Generators and Motors
[Home] - [HELP] - [Forums] - [Library] - [Photo Gallery] - [Groups] - [Classified Ads] - [Subscribe] - [Links] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Vintage Electrical Equipment > Generators & Electric Motors General Discussion > Onan Generators
Forgot Password? Join Us!

Notices

Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan 45.0EM Starter Ring Gear


this thread has 9 replies and has been viewed 286 times

Reply
 
Thread Tools Display Modes
  #1  
Old 11-13-2017, 10:20:44 PM
mazdaboi mazdaboi is offline
Registered
 
Join Date: Jun 2017
Location: Pittsburgh, Pennsylvania, USA
Posts: 8
Thanks: 2
Thanked 0 Times in 0 Posts
Default Onan 45.0EM Starter Ring Gear

All,

A few months ago, I posted about buying a 45.0EM for use to power my hobby needs, and for a backup generator for the household. The road to get to where I'm at has been a bit long, and I have not reached my destination yet, for a variety of reasons. One thing after another....

The latest is that the starter ring gear has came off the flywheel. I'm assuming that the ring gear is heat fitted to the flywheel, as it would be on a standard Ford flywheel. I've not pulled the engine yet... Pulled the starter to confirm the diagnosis. Was a bit frustrated, so I let it be for a week. But, I obviously need a new ring gear.

My question is this... Does Onan use a standard sized Ford ring gear, or is it specific to Onan? I looked in one of the parts manuals and found part # 104-0723 seems to be the Onan #. But if it's a standard Ford sized part, might be easier to find it from a standard parts house. I'd like to go ahead and order one and get it shipped in so I can perhaps separate the head and engine this weekend, and get the ring gear fitted.

Next hurdle will be realigning the rotor and crankshaft.. Better start researching that procedure now, while I wait for a ring gear to be ordered and arrive.

Appreciate any info in advance.

Thanks!
Brad
Reply With Quote
Sponsored Links
  #2  
Old 11-13-2017, 10:48:04 PM
Birken Vogt Birken Vogt is online now
Email NOT Working
 
Join Date: Sep 2009
Location: Penn Valley, California, USA
Posts: 1,480
Thanks: 2
Thanked 463 Times in 329 Posts
Default Re: Onan 45.0EM Starter Ring Gear

Your safest bet will probably be to get one from a Ford Power Products (industrial engines) dealer. Onan will have it but it will be expensive. Ford might be pricey also but at least you will know it is right. Chances are the auto parts store will have it also but you will need to remove the old one and bring it in and possibly wait for a replacement.
Reply With Quote
  #3  
Old 11-14-2017, 07:56:15 AM
mazdaboi mazdaboi is offline
Registered
 
Join Date: Jun 2017
Location: Pittsburgh, Pennsylvania, USA
Posts: 8
Thanks: 2
Thanked 0 Times in 0 Posts
Default Re: Onan 45.0EM Starter Ring Gear

Thank you for the input.

I will get it pulled apart this weekend, and get the ring gear and flywheel out. Will examine the ring gear and compare it to the stock Ford options out there....

I have been looking for the Onan part number I mentioned previously.... I'm finding it listed as discontinued on every site I've found it referenced, and no cross referenced replacement.

*Fingers crossed* Really hope a Ford part will match up. This genny has been one trial after another. Just worried about what issue I'll run into after the ring gear is repaired.

Thanks,
Brad
Reply With Quote
  #4  
Old 11-14-2017, 11:18:31 AM
Birken Vogt Birken Vogt is online now
Email NOT Working
 
Join Date: Sep 2009
Location: Penn Valley, California, USA
Posts: 1,480
Thanks: 2
Thanked 463 Times in 329 Posts
Default Re: Onan 45.0EM Starter Ring Gear

Maybe I made an inaccurate statement about Onan/Cummins having one available.

But I have bought lots of parts from Cummins that showed on all the web sites as NLA. On the other hand I have also been surprised that something in recent production was listed as obsolete. Plus the prices are all over the map.

Ring gears are something there has been pretty good aftermarket support for. A friend of mine had a GM Bedford engine which needed a ring gear. He looked all over and wound up at a clutch shop. They had a ring gear for some kind of Cat engine with the right teeth but quite a bit smaller I.D. They turned the flywheel on a lathe to make it fit and it worked great.

You should not have to go to that length on a common Ford engine.

At the absolute worst case, get it off by heat and not by chisel. Then if you absolutely cannot find one you can flip it over and/or turn it so the starter lands on good spots. Engines usually stop at the same spot when they come to rest so there will be chewed spots and spots that are not chewed.
Reply With Quote
  #5  
Old 11-14-2017, 01:21:58 PM
Oldpart Oldpart is offline
Registered-I
 
Join Date: Oct 2014
Location: Darragh, Pennsylvania
Posts: 90
Thanks: 14
Thanked 40 Times in 26 Posts
Default Re: Onan 45.0EM Starter Ring Gear

If the ring gear simply came off because of too little shrink fit interference it could probably be reused by pressing it back on the flywheel using loctite sleeve retainer. The stuff is incredible. You could not heat the ring gear to drop it on but you could press it on after cleaning both parts perfectly. If the ring is junk - well that's another matter.
Reply With Quote
The Following 2 Users Say Thank You to Oldpart For This Post:
  #6  
Old 11-14-2017, 05:05:51 PM
Troll Troll is offline
Subscriber
 
Join Date: Jan 2017
Location: Farmington, Illinois
Posts: 541
Thanks: 15
Thanked 320 Times in 163 Posts
Default Re: Onan 45.0EM Starter Ring Gear

Eight evenly spaced tack welds using 309L stainless rod will retain a ring gear that is not salvageable by other means also. Rather permanent however.
Reply With Quote
  #7  
Old 11-14-2017, 06:25:41 PM
Power Power is offline
Registered-III
 
Join Date: Aug 2011
Location: New Jersey
Posts: 4,063
Thanks: 966
Thanked 2,313 Times in 1,348 Posts
Default Re: Onan 45.0EM Starter Ring Gear

Quote:
Originally Posted by Oldpart View Post
If the ring gear simply came off because of too little shrink fit interference it could probably be reused by pressing it back on the flywheel using loctite sleeve retainer. The stuff is incredible. You could not heat the ring gear to drop it on but you could press it on after cleaning both parts perfectly. If the ring is junk - well that's another matter.
I agree. flip it, clean up contact surfaces and use locktite bearing lock or sleeve retainer. Last resort is tack welds. A new ring gear may not be the answer. If the existing ring gear had been slipping before it fell off, the flywheel contact surfaces may have been milled undersize, and the new ring gear will slip.
Reply With Quote
  #8  
Old 11-14-2017, 07:36:41 PM
Gunny Gunny is offline
Subscriber
 
Join Date: Feb 2005
Location: North Carolina
Posts: 3,624
Thanks: 1,420
Thanked 1,526 Times in 975 Posts
Default Re: Onan 45.0EM Starter Ring Gear

If my memory is correct, that is a standard Ford part, nothing special about it.

Can't flip it over, teeth on the drive side are beveled.

Have never seen one slip, usually have a tooth or teeth missing or damaged. Consider a new starter to go with a new ring gear.

Pretty easy to align, can take 2 bolts a little longer than the original bolts, cut the heads off and grind a bevel. Don't run them all the way in so you can grip them and screw them back out when the others are started. Pretty easy to do, go carefully and you shouldn't need much force.

I've never used any adhesive to hold it together. Just heat it barely red and drop it on, might need to tap it a little. Be sure to get the bevel end right. Take the old one off by grinding through it.

If slipping, you could do some tack welds evenly spaced. Could grind the welds back off if you need to take it off. Not how I'd do it but if that's what you have to do....
Reply With Quote
  #9  
Old 11-15-2017, 07:51:38 AM
mazdaboi mazdaboi is offline
Registered
 
Join Date: Jun 2017
Location: Pittsburgh, Pennsylvania, USA
Posts: 8
Thanks: 2
Thanked 0 Times in 0 Posts
Default Re: Onan 45.0EM Starter Ring Gear

Thank you all very much for the additional advice. I've now got a few options to look at, depending on what I find when I pull the engine.

This happened a couple weeks ago, when I was trying to get the gas regulator adjusted. The last time I fired it up, the starter spun up, but the engine did not. Tapped the starter to make sure the throw out wasn't sticking. No change. Figured I hit a bad spot on the ring gear, so I turned the engine over by hand, then tried again. This time, it sounded like a metal hula hoop in a tin can. Pulled the starter to confirm what my ears had told me... Ring gear had came off.

The real question is why. It has never sounded like it was slipping previously. Best case, the ring gear broke somehow and a replacement ring gear will get me back to where I was. Worst case, if the flywheel mating surface is somehow not the exact diameter it's supposed to be, then I guess I'll be in the market for a new flywheel.

So, yeah.... I need to get the engine hoist up to the barn tonight and start to pull the engine. Can't order parts until I know what I'm dealing with. Thanks to you guys, I have a few options to explore, depending upon what I see.

I'll let you know what I find.

Thanks!
Brad
Reply With Quote
  #10  
Old 11-15-2017, 06:16:07 PM
Gunny Gunny is offline
Subscriber
 
Join Date: Feb 2005
Location: North Carolina
Posts: 3,624
Thanks: 1,420
Thanked 1,526 Times in 975 Posts
Default Re: Onan 45.0EM Starter Ring Gear

I never pulled the engine in the couple of dozen I've done through the years.

Slide the generator back about 12 to 18", after unbolting from the engine and you';; have plenty of room to get the flywheel out.

There was a campaign in the mid 90's to replace the bolts on thew flex plate, made up a jig with some wheels (casters) and most of the time was a quick and easy job. Unless the installing sparktrician did something wild, that happened too often.

Really an easy job in the overall scope of things.
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Rumely 6A Starter Ring Gear Pete Wheeler Antique Farm Tractors 2 11-17-2015 12:42:49 PM
Onan ring gear source? 67CarNut Onan Generators 16 10-26-2014 03:57:02 PM
Onan 15.RJC ring gear part # tlhigham Onan Generators 8 02-05-2011 10:14:33 AM
Need Kohler / Waukesha Engine Ring-Gear Starter setup BergmanJ Kohler Generators 7 01-15-2010 12:11:48 PM
Onan ring gear bdbowtie Onan Generators 5 05-25-2009 11:17:47 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 05:14:54 PM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2016 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277