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

ST Head on my Onan MDJE Motor


this thread has 10 replies and has been viewed 1520 times

Reply
 
Thread Tools Display Modes
  #1  
Old 12-07-2012, 04:54:52 PM
Graycenphil Graycenphil is offline
Registered-III
 
Join Date: Sep 2011
Location: Eastford, Connecticut
Posts: 787
Thanks: 613
Thanked 160 Times in 122 Posts
Default ST Head on my Onan MDJE Motor

So my MDJE generator head is dead (discusssed in another thread) but the motor is great. At the suggestion of a few folks, I am considering connecting an ST head to the Onan engine. (Will I have to move the thread out of the Onan Generators forum? Will old DW haunt me?)

I believe it is as simple a smatter as mounting the head on a frame next to the end of the engine, then connecting it with something like a Lovejoy. Start the engine, and electricity coemes out of the ST. Is that right?
ant issues to be aware of? Will it be good, stable, clean electricity?

Thanks.
Reply With Quote
Sponsored Links
  #2  
Old 12-07-2012, 05:08:58 PM
Wayne 440 Wayne 440 is offline
Registered-III
 
Join Date: Nov 2004
Location: Kentucky
Posts: 5,231
Thanks: 316
Thanked 4,313 Times in 2,062 Posts
Default Re: ST Head on my MDJE Motor

My experience with ST generators is that they make electricity, which beats not having any by a large margin. So in that context it is "good" electricity.

If the other two adjectives are critical, consider a Marathon, Winco or similar generator end. Not inexpensive, but far ahead of the ST in quality and capability. The Winco 8KS2GC-3 might be a good match.

---------- Post added at 03:08 PM ---------- Previous post was at 03:06 PM ----------

That Winco turns at 3600, so scratch that one...
Reply With Quote
  #3  
Old 12-07-2012, 08:54:25 PM
Graycenphil Graycenphil is offline
Registered-III
 
Join Date: Sep 2011
Location: Eastford, Connecticut
Posts: 787
Thanks: 613
Thanked 160 Times in 122 Posts
Default Re: ST Head on my MDJE Motor

That was my problem - there are so few 1800 rpm gneerator heads sold.

I imagine the frequency will be pretty stable because it is a product of the Onan governor. But what will be inferior about the ST electricity? Does the voltage vary a lot?

How exactly does it regulate the voltage? I believe the Onan AVR varies the field current according to the AC voltage it senses? How is the ST doing it?
Reply With Quote
  #4  
Old 12-07-2012, 09:18:54 PM
scoops scoops is offline
Registered-III
 
Join Date: Oct 2008
Location: pittsburgh
Posts: 1,003
Thanks: 321
Thanked 425 Times in 311 Posts
Default Re: ST Head on my MDJE Motor

See here

http://www.utterpower.com/voltage-excitation/

And here

http://www.utterpower.com/ST.htm
Reply With Quote
The Following User Says Thank You to scoops For This Post:
  #5  
Old 12-07-2012, 11:02:05 PM
BigBlockChev's Avatar
BigBlockChev BigBlockChev is offline
Subscriber
 
Join Date: Jan 2007
Location: Coquitlam, BC, Canada
Posts: 1,846
Thanks: 316
Thanked 1,373 Times in 808 Posts
Default Re: ST Head on my MDJE Motor

If you really need to use a 3600rpm generator head with your Onan engine you can always use a 2/1 belt drive sheave setup. You are going to have to figure out how to connect the generator output shaft to some sort of coupling in any case as nothing will bolt on to the taper on the existing engine, Machining will be necessary.
Reply With Quote
  #6  
Old 12-07-2012, 11:23:57 PM
scoops scoops is offline
Registered-III
 
Join Date: Oct 2008
Location: pittsburgh
Posts: 1,003
Thanks: 321
Thanked 425 Times in 311 Posts
Default Re: ST Head on my MDJE Motor

If it were me, I'd save the rotor,

I keep the part that mates with the taper, have it cut put a key way in and a love joy on, and find a smaller length bolt.
Reply With Quote
  #7  
Old 12-07-2012, 11:52:09 PM
moteurdelco moteurdelco is offline
Registered-II
 
Join Date: May 2012
Location: St-Barnabé, Québec, Canada
Posts: 570
Thanks: 237
Thanked 197 Times in 163 Posts
Default Re: ST Head on my MDJE Motor

rewind the exciter field ,the other parts are ok if you were having 45 vac without excitation. bearing 6205 is cheap to buy.
Reply With Quote
  #8  
Old 12-08-2012, 07:50:16 AM
Graycenphil Graycenphil is offline
Registered-III
 
Join Date: Sep 2011
Location: Eastford, Connecticut
Posts: 787
Thanks: 613
Thanked 160 Times in 122 Posts
Default Re: ST Head on my MDJE Motor

Quote:
Originally Posted by bigblockchev View Post
If you really need to use a 3600rpm generator head with your Onan engine you can always use a 2/1 belt drive sheave setup. You are going to have to figure out how to connect the generator output shaft to some sort of coupling in any case as nothing will bolt on to the taper on the existing engine, Machining will be necessary.
One of those Lovejoy connectors won't attach to the engine shaft?

Quote:
Originally Posted by scoops View Post
If it were me, I'd save the rotor,

I keep the part that mates with the taper, have it cut put a key way in and a love joy on, and find a smaller length bolt.
I suppose I could do that. Same question as above - the Lovejoy won't attach to the shaft directly?

Quote:
Originally Posted by moteurdelco View Post
rewind the exciter field ,the other parts are ok if you were having 45 vac without excitation. bearing 6205 is cheap to buy.
I wouldn't mind doing that, but everything else sure is rusty and corroded. And I can't say I didn't do some damage taking everything apart.
Reply With Quote
  #9  
Old 12-08-2012, 09:17:11 AM
scoops scoops is offline
Registered-III
 
Join Date: Oct 2008
Location: pittsburgh
Posts: 1,003
Thanks: 321
Thanked 425 Times in 311 Posts
Default Re: ST Head on my Onan MDJE Motor

The taper is specific to onan.
I'm sure one of the experts here probably knows the taper size,


I've never seen a taperered love joy.
Keep you rotor shaft, a machinist could easily make you what you need
Reply With Quote
  #10  
Old 12-08-2012, 10:00:36 AM
Wayne 440 Wayne 440 is offline
Registered-III
 
Join Date: Nov 2004
Location: Kentucky
Posts: 5,231
Thanks: 316
Thanked 4,313 Times in 2,062 Posts
Default Re: ST Head on my Onan MDJE Motor

Why not just look for an Onan generator end? xJB, xJC ends are not that hard to find, and should "bolt on ". I have a 12.5kw single phase YD end that is probably good, and almost certainly less corroded than the one you have, but shipping would kill the deal.

Why not post an ad on the classified part of this site, you may get one lots closer. http://www.enginads.com/classifieds/showcat.php/cat/35
Reply With Quote
The Following User Says Thank You to Wayne 440 For This Post:
  #11  
Old 12-08-2012, 10:24:18 AM
Graycenphil Graycenphil is offline
Registered-III
 
Join Date: Sep 2011
Location: Eastford, Connecticut
Posts: 787
Thanks: 613
Thanked 160 Times in 122 Posts
Default Re: ST Head on my Onan MDJE Motor

I will keep the shaft, maybe just cut off the coils so it isn't so heavy.

Is that true, many Onan heads will fit this shaft? I like that better than an ST. The bolt happens to be broken off in the crankshaft, but I have plenty of time to fix that.

I tried to list my old CW on the engine ads, but was thwarted by cmputer stuff.
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
MDJE Head Gasket airbatica Onan Generators 1 11-01-2010 12:45:30 PM
MDJE Head temps at cut out switch FLracer Onan Generators 4 08-29-2010 02:24:47 AM
Onan MDJE - blows Blue smoke after replacing Head Gasket robertinmaine Onan Generators 6 08-25-2010 12:55:52 PM
Onan MDJE 6-7.5KW Help Mainshiptom Onan Generators 4 04-19-2010 05:32:50 PM
I think this is a T-Head motor? 61sprite Antique Gas Engine Discussion 15 10-18-2008 06:46:46 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 01:16:57 AM.

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