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!


Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

4.0cck-3cr/12017R Natural gas derating, gaskets, and circuit boards

this thread has 1 replies and has been viewed 880 times

Thread Tools Display Modes
Old 04-28-2013, 05:04:51 PM
gchank gchank is offline
Join Date: Nov 2012
Location: New Jersey, USA
Posts: 220
Thanks: 127
Thanked 65 Times in 43 Posts
Default 4.0cck-3cr/12017R Natural gas derating, gaskets, and circuit boards

Just got my new dual fuel carb for the 4.0. I understand the engine is the same as the 5.0 so if I go to natural gas do I still derate?

The manuals I recieved have "old" numbers on the gaskets for the manifold? Anyone off hand know the gasket numbers for the intake and exhaust gaskets?

I am buying a flight panel 300C859 replacement board, what does the one underneath do 300-1227 board? Should I also replace that one?..

Should I also decarbonize the heads while I am in there? Do I replace those or can I reuse them?

Reply With Quote
Sponsored Links
Old 04-28-2013, 05:59:11 PM
MBB MBB is offline
Join Date: Apr 2009
Location: Elk Grove Village IL USA
Posts: 3,356
Thanks: 1,453
Thanked 2,936 Times in 1,477 Posts
Default Re: 4.0cck-3cr/12017R Natural gas derating, gaskets, and circuit boards

You shouldn't have to de-rate. Like you say the motor is the same for the 5.0On the old parts number substitute the letter with a 0 (Zero) . You can check the heads. If your careful you can use the gaskets again. The old gaskets are much better than the new.
Head gasket 110-0892
Intake gasket 154-0013
Exhaust gasket 154-0360
Reply With Quote
The Following 3 Users Say Thank You to MBB For This Post:

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
Mama wants bigger than Onan 4.0cck-3cr/12017R gchank Onan Generators 24 04-25-2013 11:59:17 AM
Circuit breakers for Onan 4.0CCK? c east Onan Generators 4 06-17-2011 10:03:48 AM
Onan 4.0CCK Q&D Natural Gas Conversion Pierce Roselle Onan Generators 5 05-26-2011 10:34:44 PM
Natural gas conversion 5.0cck now Works MBB Onan Generators 3 03-18-2011 09:29:37 PM
Onan 4k BGEFA would like to rewire and get rid of circuit boards oldsteveo Onan Generators 9 11-08-2010 09:25:25 AM

Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 11:06:31 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