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 4.0 BFA Project


this thread has 36 replies and has been viewed 1160 times

Reply
 
Thread Tools Display Modes
  #1  
Old 08-30-2017, 08:58:26 PM
Handyhiker1 Handyhiker1 is offline
Registered-II
 
Join Date: Jul 2014
Location: Akron, Ohio
Posts: 666
Thanks: 388
Thanked 311 Times in 157 Posts
Default Onan 4.0 BFA Project

I picked up a new to me project tonight, a 4.0 BFA that is missing s few parts. It needs an intake manifold, carb snd air cleaner housing. It is a low hour unit, less then 100 according to the seller. One of his mechanics took it apart to paint it and got put in jail for DUI multiple times. He couldn't find where the parts were. It was going to be painted red. He also has a 1957 4.0cck that was in process of being painted and torn down. Also missing some parts.
I looked at the tag and it is stamped as a 1R but it does have the 4 leads out of the generator and the diagram under the cover does show 120/240 hook ups.
Billy has offered a manidold so now I need ro find a carb and air filter housung. Here are a few pics.

Here are the numbers.
4.0 BFA-1R716004A
D783335357
Attached Thumbnails
Click image for larger version

Name:	20170830_195200.jpg
Views:	74
Size:	83.9 KB
ID:	289886   Click image for larger version

Name:	20170830_195857.jpg
Views:	71
Size:	58.1 KB
ID:	289887   Click image for larger version

Name:	20170830_195822.jpg
Views:	65
Size:	70.6 KB
ID:	289888   Click image for larger version

Name:	20170830_195212.jpg
Views:	74
Size:	85.9 KB
ID:	289889  

Reply With Quote
The Following User Says Thank You to Handyhiker1 For This Post:
Sponsored Links
  #2  
Old 08-30-2017, 09:49:32 PM
Billy J Shafer's Avatar
Billy J Shafer Billy J Shafer is online now
Subscriber
 
Join Date: Nov 2004
Location: Centerville, Texas
Posts: 16,576
Thanks: 8,517
Thanked 13,945 Times in 6,557 Posts
Default Re: Onan 4.0 BFA project

I have your manifold almost ready to ship. But with the water problems down here. A little slow. I also have the air filter assembly.
__________________
I don't talk to myself. This early in the morning. Why the hell should I talk to you.
Reply With Quote
The Following 2 Users Say Thank You to Billy J Shafer For This Post:
  #3  
Old 08-30-2017, 11:13:23 PM
JohnnyC JohnnyC is online now
Subscriber
 
Join Date: Jun 2014
Location: Boonton, New Jersey
Posts: 4,332
Thanks: 1,366
Thanked 2,059 Times in 1,218 Posts
Default Re: Onan 4.0 BFA project

Those 4.0 BFA's are tough. I tried to kill mine in many ways and failed. Human piss poured down the carb did absolutely nothing to it as well as anything else that I could find (no, I did not poop on it). I ended up giving up and restored it. Good luck with yours.

JohnnyC
New Jersey
Reply With Quote
The Following 2 Users Say Thank You to JohnnyC For This Post:
  #4  
Old 08-30-2017, 11:22:17 PM
yellowlister yellowlister is offline
Subscriber
 
Join Date: Feb 2010
Location: Granada Hills, California
Posts: 4,062
Thanks: 1,960
Thanked 2,070 Times in 1,322 Posts
Default Re: Onan 4.0 BFA project

I think pooping on it would just make it stink, depending on where the poo landed might make it burn just make the neighborhood and you smell like poo...that is if it has the same effect of pissing in a fire..
Reply With Quote
The Following 2 Users Say Thank You to yellowlister For This Post:
  #5  
Old 08-31-2017, 04:48:11 AM
Handyhiker1 Handyhiker1 is offline
Registered-II
 
Join Date: Jul 2014
Location: Akron, Ohio
Posts: 666
Thanks: 388
Thanked 311 Times in 157 Posts
Default Re: Onan 4.0 BFA project

Quote:
Originally Posted by Billy J Shafer View Post
I have your manifold almost ready to ship. But with the water problems down here. A little slow. I also have the air filter assembly.
No hurry. I am sure you have bigger things to worry about. If you have both pieces, I would really appreciate them. I got 2 new carbs in the parts I bought last weekend but sure enough, they are not for a BFA.
Reply With Quote
  #6  
Old 08-31-2017, 08:07:47 PM
Handyhiker1 Handyhiker1 is offline
Registered-II
 
Join Date: Jul 2014
Location: Akron, Ohio
Posts: 666
Thanks: 388
Thanked 311 Times in 157 Posts
Default Re: Onan 4.0 BFA project

Well, good and bad news. I pulled all the output wire off this and just threw it away after finding that stuff on the 12.5 JC. After that I did turn it over with a socket and ratchet just to see how it felt. Almost no compression. Pulled the plugs,and both were almost completely carboned over. There was no gap, just carbon. With the plugs out I could look in the cylinders, yup, lots of carbon!!
I pulled the right head and could not believe all the crap in the cylinder. Below are before and after pics. Tomorrow I will tackle the other one.
I really do believe that this is a low hour unit but I believe it had a rough life. With that much in the cylinders there is no way it has ever been worked very hard. There was no lip in the cylinders and some of the cross hatch is still there. All in all, I think a good cleaning and going over then to find a carb and life will be good.
With the plugs out did hook up a battery charger with start boost and spun her over. The start switch works and after cleaning the plugs, there was spark. Only did it for a couple seconds just to check for spark and if it would turn over.
Attached Thumbnails
Click image for larger version

Name:	20170831_164402.jpg
Views:	52
Size:	138.7 KB
ID:	289979   Click image for larger version

Name:	20170831_183346.jpg
Views:	48
Size:	178.3 KB
ID:	289980   Click image for larger version

Name:	20170831_164216.jpg
Views:	51
Size:	155.8 KB
ID:	289981   Click image for larger version

Name:	20170831_182033.jpg
Views:	51
Size:	171.2 KB
ID:	289982  

Reply With Quote
  #7  
Old 08-31-2017, 08:16:04 PM
JohnnyC JohnnyC is online now
Subscriber
 
Join Date: Jun 2014
Location: Boonton, New Jersey
Posts: 4,332
Thanks: 1,366
Thanked 2,059 Times in 1,218 Posts
Default Re: Onan 4.0 BFA project

How does the cylinder bores look? See any hone marks? Or smooth as a baby's azz? After cleaning it up and putting it back together, do a compression test. I think I have NEW head gaskets. They are made of composite graphite. I was able to reused my old (non composite) head gaskets. You may be able too, but it you determine that your head gaskets are toast, I will look for my gaskets and send you my new head gaskets FREE if you commit to getting the BFA running.

JohnnyC
New Jersey
Reply With Quote
The Following User Says Thank You to JohnnyC For This Post:
  #8  
Old 08-31-2017, 08:32:12 PM
Handyhiker1 Handyhiker1 is offline
Registered-II
 
Join Date: Jul 2014
Location: Akron, Ohio
Posts: 666
Thanks: 388
Thanked 311 Times in 157 Posts
Default Re: Onan 4.0 BFA project

There are home marks in the cylinder. There was some really light pitting on the botom but not nough to worry about. The head gasket looked good. I cleaned it up and it is already reinstalled. The BFA WILL run again. The carbs I have are for a BEG and from what I can figure out, a welder. Might sell them to get money to buy the right crab.
Reply With Quote
  #9  
Old 08-31-2017, 08:40:50 PM
JohnnyC JohnnyC is online now
Subscriber
 
Join Date: Jun 2014
Location: Boonton, New Jersey
Posts: 4,332
Thanks: 1,366
Thanked 2,059 Times in 1,218 Posts
Default Re: Onan 4.0 BFA project

Quote:
Originally Posted by Handyhiker1 View Post
There are home marks in the cylinder. There was some really light pitting on the botom but not nough to worry about. The head gasket looked good. I cleaned it up and it is already reinstalled. The BFA WILL run again. The carbs I have are for a BEG and from what I can figure out, a welder. Might sell them to get money to buy the right crab.
The original carburetor for my 4.0 BFA is a Walbro, but I was able to run a Niki carburetor from a larger T260G Onan motor without any problems. The Niki carburetor from the T260G motor has a much larger venturi than the OEM Niki on my 6.5 NH. I assume the larger venturi was for more air flow required for the T260G motor that was mounted on a zero turn lawn mower and the motor was designed for up to 3600 rpm use. The Niki and Walbro carburetors swapped without a single modification to the BFA's motor's manifold and linkage.

JohnnyC
New Jersey
Reply With Quote
  #10  
Old 08-31-2017, 09:09:51 PM
Handyhiker1 Handyhiker1 is offline
Registered-II
 
Join Date: Jul 2014
Location: Akron, Ohio
Posts: 666
Thanks: 388
Thanked 311 Times in 157 Posts
Default Re: Onan 4.0 BFA project

The carb I have uses a rubber fuel hose and a manual choke. The part number is 146-0660.

Here is a guy selling a used one and wants $200. Mine is new in the box.

Look at this on eBay http://www.ebay.com/itm/171670219086
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
Onan BGE project KPack Onan Generators 14 10-24-2016 03:10:12 PM
New (to me!) Onan 4.0 CCK Project 808Guy Onan Generators 36 02-16-2016 01:27:58 AM
Onan djb project yellowlister Onan Generators 30 04-13-2015 10:06:21 AM
Onan CCK Project B.Ikard Onan Generators 7 02-26-2012 11:26:29 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 12:01:56 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