Home » Public Forums » GMCnet » Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
Re: [GMCnet] So, about removing the Onan heads and looking for carbon... [message #192742] |
Mon, 10 December 2012 20:30 |
Marcus McGee
Messages: 112 Registered: March 2004
Karma:
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Senior Member |
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Worked for me when I did it that way.
Marcus
----- Original Message -----
From: "Rob Mueller" <robmueller@iinet.net.au>
To: gmclist@temp.gmcnet.org
Date: Mon, 10 Dec 2012 21:27 -0500
Subject: Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
> Robin,
>
> I'm going to suggest the following, HOWEVER, before you do it see what the general consensus is about the idea.
>
> 1) Screw four bolts back into the head at each "corner" leaving them about 1/8" away from the head.
> 2) Put the spark plug back into the head on that side,
> 3) Disconnect the leads from both spark plugs.
> 4) Hit the start button.
> 5) The compression should separate the head from the block.
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: Robin Hood
>
> Is there a trick to getting the cylinder head off once the 10 bolts
> and washers and nuts is accomplished? I can't seem to get it to budge.
> Also, the left side cylinder head cooling fins are COVERED in oil.
>
> http://youtu.be/CeExXjNEPUQ
>
> On Mon, Dec 10, 2012 at 3:59 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> > Robin,
> >
> > You can clean the carbon (black / brown stuff) off the heads and the top of the piston with Easy Off Oven Cleaner.
> >
> > The heads are easy:
> >
> > 1) Put several layers of news paper down on your garage floor
> > 2) Lay the heads on the newspaper with the carbon facing up
> > 3) Spray the heads with Easy Off
> > 4) Let it soak in and loosen the carbon
> > 5) Scrap / wire brush the carbon stuff off
> > 6) Spray them again if it all didn't come off
> >
> > The pistons are a bit tricky
> >
> > 1) Turn over the Onan until one of the pistons is all the way up in the cylinder
> > 2) Spray it with Easy Off
> > 3) Let it soak in and loosen the carbon
> > 4) Scrap / wire brush the carbon off
> > 5) Spray them again if it all didn't come off
> > 6) When all the carbon is off the piston take a can of WD-40 and spray it in the space between the piston and cylinder start at
> > 12:00 and go counter clockwise down to 6:00. Repeat going from 12:00 to 6:00 clockwise. Do this several time to get all the Easy
> Off
> > out between the piston and cylinder.
> > 7) Rotate the Onan enough to lower the piston about 1/2 inch in the cylinder and wipe the bore out
> > 8) Return the piston to its original position and repeat the WD-40 spray.
> >
> > I used this procedure on Harleys a lot and never had any problems.
> >
> > Regards,
> > Rob M.
> >
> > From: Robin Hood
> >
> > What am I looking for, exactly, and what do I do with it when I find it?
> >
> > I need to remove the Onan cover from over the heads and clean the cooling fins.
> > I need to take off the cylinder heads and "look for carbon" but I've
> > never done this before so I don't really know what I'm looking for.
> > Surely somebody has documented the process on the GMC photo site?
> > If there's any carbon, I have to clean it away. Whether this requires
> > chemicals or just a damp rag I don't know. Neither do i know what it's
> > even necessary in the first place... but I do know I don't want to get
> > back into my Onan once I've got it in the coach.
> > Need a carb kit from JimK just to be on the safe side. My chemdip
> > prolly ate the gaskets in the needle/seat (I didn't know that stuff
> > was removable),
> >
> > --
> > Robin
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
>
> --
> Robin Hood
> Jackson, MS
> 2003 Buick Lesabre
> 1968 Pontiac Catalina
> 1978 GMC Royale motorhome
> 1977 GMC Palm Beach motorhome
> _______________________________________________
> GMCnet mailing list
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>
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: USAussie on Wed, 12 December 2012 00:03
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: JohnL455 on Wed, 12 December 2012 07:35
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: USAussie on Thu, 13 December 2012 07:35
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: USAussie on Thu, 13 December 2012 08:00
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: k2gkk on Thu, 13 December 2012 08:12
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: USAussie on Sun, 16 December 2012 16:25
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: USAussie on Sun, 16 December 2012 17:50
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: C Boyd on Mon, 17 December 2012 20:05
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: C Boyd on Mon, 17 December 2012 20:42
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: C Boyd on Mon, 17 December 2012 21:01
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: Dennis S on Mon, 17 December 2012 22:26
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] Onan Choke was (removing the Onan heads and looking for carbon.)
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Re: [GMCnet] Onan Choke was (removing the Onan heads and looking for carbon.)
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Re: [GMCnet] Onan Choke was (removing the Onan heads and looking for carbon.)
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Re: [GMCnet] Onan Choke was (removing the Onan heads and looking for carbon.)
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: Carl S. on Thu, 13 December 2012 09:22
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: Carl S. on Thu, 13 December 2012 10:51
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: Carl S. on Thu, 13 December 2012 13:09
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
By: USAussie on Thu, 13 December 2012 16:20
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Re: [GMCnet] So, about removing the Onan heads and looking for carbon...
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