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Onan B48G Maintenance

onan b48g b48g onan maintenence onan decarbon

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#1 KennyP OFFLINE  

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Posted May 17, 2014 - 01:29 PM

I was having starter issues on the Onan in my FF. To pull the starter, You have to pull the engine as the flywheel shroud is right against the firewall and has to come off. Taking the flywheel off helps, also. Since the engine was coming out, I wanted to check where I was getting a leak from and decarbon the cylinders. Plus, the valve lash needs to be checked.

After pulling the starter, I found the brushes were non-existant. Time for a new set. Front seal proved to NOT be the source of the leak, it's the drain plug.

Anyways, I took all tins off, covered all openings and gave the Onan and the engine compartment a bath this morning. They both needed it.

Here's some pics.

Image001.jpg     Image002.jpg

Image003.jpg     Image004.jpg

Image005.jpg     Image006.jpg

Image007.jpg

 

I ordered the valve grind/decarbon gasket set from these great folks. I will be ordering the starter parts from them as well.

 


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#2 Bmerf ONLINE  

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Posted May 17, 2014 - 02:33 PM

I've order stuff from them before. Good people and fast shipping. :thumbs:


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#3 KennyP OFFLINE  

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Posted May 17, 2014 - 03:23 PM

Got it opened up! Came in to get the specs for setting the valves. Here's a few pics of what I found.

#1 cylinder:

Image008.jpg     Image010.jpg

 

#2:

Image009.jpg

 

Head for #2:

Image011.jpg     Image012.jpg


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#4 JDBrian OFFLINE  

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Posted May 17, 2014 - 06:49 PM

Looks like it was time to clean things up in there. How do the cylinders look?  


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#5 KennyP OFFLINE  

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Posted May 17, 2014 - 07:12 PM

Looks like it was time to clean things up in there. How do the cylinders look?  

Yep! Cylinders look real good considering. No ring groove at the top of the cylinders. I got things cleaned as best I could and put it back together. Now for starter parts!

Image013.jpg     Image014.jpg



#6 JDBrian OFFLINE  

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Posted May 17, 2014 - 07:17 PM

Kenny, that square hole for the plug looks odd. I've never seen an Onans insides before. It probably doesn't have a lot of hours on it. I wonder if it will reduce carbon to run some sea foam through it on a regular basis. 



#7 KennyP OFFLINE  

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Posted May 17, 2014 - 07:25 PM

Kenny, that square hole for the plug looks odd. I've never seen an Onans insides before. It probably doesn't have a lot of hours on it. I wonder if it will reduce carbon to run some sea foam through it on a regular basis. 

Seafoam is a part of it's regular diet. The carbon was not hard at all. I haven't had one apart before and the plug hole is a bit odd. I amy add some MMO to the diet too!



#8 KennyP OFFLINE  

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Posted May 18, 2014 - 05:59 AM

I forgot to add what I used to remove the carbon build up. I have a small cup brush I use in the 3000 RPM 3/8" drill. That took care of most all in the flat areas. Then it was soak some with carb cleaner and pick at it with the side of a screwdriver to get the rest.


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#9 KennyP OFFLINE  

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Posted May 21, 2014 - 09:15 PM

I ordered the starter parts Monday morning and had them in hand this afternoon. Those folks at gphope.com are very good to deal with. I got the starter back together and tested. Put it back on and got the engine all buttoned up. It is installed and has been started. Sounds real sweet now!


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#10 Texas Deere and Horse OFFLINE  

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Posted May 21, 2014 - 09:49 PM

Glad to see you got it back together and running. It almost looked like you had block deterioration between the valves and cylinder wall. Very nice job Kenny.



#11 KennyP OFFLINE  

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Posted May 22, 2014 - 05:55 AM

Glad to see you got it back together and running. It almost looked like you had block deterioration between the valves and cylinder wall. Very nice job Kenny.

It was only the carbon, Brian. I'm real happy to have it back running. I'll get a battery for it this morning. I did clean the tins and shot some new paint on them. I'll have pics later.

 

By the way, have you ever found that 1-7/16" PTO? Sure would be nice to have one on here!


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#12 KennyP OFFLINE  

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Posted May 22, 2014 - 06:23 PM

Here's pics of what it looks like installed.

Image091.jpg     Image092.jpg

 

It has started and ran very well today!

 


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#13 MH81 ONLINE  

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Posted May 22, 2014 - 10:10 PM

Good looking refresh Kenny, glad to hear you're happy with results.
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#14 superaben OFFLINE  

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Posted May 22, 2014 - 10:14 PM

It has started and ran very well today!

 

That's a great feeling... glad it worked out for you!

 

Ben W.


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#15 KennyP OFFLINE  

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Posted May 23, 2014 - 04:51 AM

It starts so much easier now! Just sounds better, too. It will now idle down quite well, almost sounds like a Harley!







Also tagged with one or more of these keywords: onan b48g, b48g, onan maintenence, onan decarbon

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