Onan Generator Carbon Knock

Mark Ruset · 12-31-2011, 09:57 PM

I believe I have developed a carbon knock in my Onan Emerald 4000 generator. Has anyone else had a similiar experience and if so is there an easy remedy?

Chuck Westcott · 01-01-2012, 09:33 AM

Onan makes a carbon remover in a spray can I believe. I remember removing the heads on a 4.0 and scraping the carbon off. Ran like new.That was a pain for sure.

Dave Tincher · 01-01-2012, 12:25 PM

Quote:

Originally Posted by Chuck Westcott

Onan makes a carbon remover in a spray can I believe. I remember removing the heads on a 4.0 and scraping the carbon off. Ran like new.That was a pain for sure.

You wont have much luck with the carbon spray. Its more for maintanance, Removing the head is a pain but its the only real fix.

DIAPERMAN · 01-01-2012, 02:03 PM

After you fix if you run some Lucas fuel treatment in every few tanks of gas this will help.I have a lot of rv buddies that swear by it. Just an idea

Mark Ruset · 01-01-2012, 02:27 PM

I was hoping that I wouldn't have to pull the head, however that seems the concensous. I thought there may be a way to inject throught the intake some sort of liquid to breakup the carbon, like GM Top Engine Cleaner.

Dave Steltz · 01-01-2012, 05:49 PM

Mark I had the same thing with my previous MH...tried a few different spays, gas treatments...didnt work...Had to pull the generator out and pull the heads off...PIA for sure...also I dunno if you can do it in the MH, it was easier for me just to pull it out....

12-31-2011, 09:57 PM	#1
Mark Ruset Member Join Date: May 2006 Location: Southwest Florida Posts: 250 Likes: 23 Liked 34 Times in 24 Posts	Onan Generator Carbon Knock I believe I have developed a carbon knock in my Onan Emerald 4000 generator. Has anyone else had a similiar experience and if so is there an easy remedy? __________________ Mark Ruset 2048 STK

01-01-2012, 09:33 AM	#2
Chuck Westcott Member Join Date: Dec 2003 Location: Brownsburg,Indiana Posts: 326 Likes: 0 Liked 0 Times in 0 Posts	Re: Onan Generator Carbon Knock Onan makes a carbon remover in a spray can I believe. I remember removing the heads on a 4.0 and scraping the carbon off. Ran like new.That was a pain for sure. __________________ Chuck Westcott- S/C -S/G 225

01-01-2012, 02:03 PM	#4
DIAPERMAN Senior Member Join Date: Apr 2007 Location: ILLINIOS Posts: 715 Likes: 2 Liked 21 Times in 6 Posts	Re: Onan Generator Carbon Knock After you fix if you run some Lucas fuel treatment in every few tanks of gas this will help.I have a lot of rv buddies that swear by it. Just an idea

01-01-2012, 02:27 PM	#5
Mark Ruset Member Join Date: May 2006 Location: Southwest Florida Posts: 250 Likes: 23 Liked 34 Times in 24 Posts	Re: Onan Generator Carbon Knock I was hoping that I wouldn't have to pull the head, however that seems the concensous. I thought there may be a way to inject throught the intake some sort of liquid to breakup the carbon, like GM Top Engine Cleaner. __________________ Mark Ruset 2048 STK

01-01-2012, 05:49 PM	#6
Dave Steltz Member Join Date: Nov 2003 Posts: 323 Likes: 0 Liked 0 Times in 0 Posts	Re: Onan Generator Carbon Knock Mark I had the same thing with my previous MH...tried a few different spays, gas treatments...didnt work...Had to pull the generator out and pull the heads off...PIA for sure...also I dunno if you can do it in the MH, it was easier for me just to pull it out.... __________________ Dave Steltz 135G SG/SP/SST BIAECH Racing Team