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ONAN JB 7.5 new life


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  #11  
Old 03-09-2017, 12:15:29 PM
Leon N. Leon N. is offline
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Default Re: ONAN JB 7.5 new life

Looks like a vacu flow plant. Maybe no tins are missing. Need to see a better picture to make sure.
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  #12  
Old 03-09-2017, 03:39:12 PM
Utah Onan Utah Onan is online now
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Default Re: ONAN JB 7.5 new life

Awesome SCORE!!! Jealous, so far I have only seen one JB out here by me.
No, your generator is not missing tins. Your video definitely shows that you have a Vacu-Flo cooled genset.
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Old 03-09-2017, 05:49:47 PM
fisherman81654 fisherman81654 is offline
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Default Re: ONAN JB 7.5 new life

Spent about half a day today adjusting valves and torqueing bolts and cleaning on the JB.
I saw an oil leak coming from some place on the fuel pump, Maybe a gasket? Not sure. Posting a picture maybe someone has had this problem before.
Oil is not seeping from the gasket area that is visible maybe on the inside somehow. I haven't taken it off yet, just wanted to get some pointers first.

It actually looks like its seeping out of that hole.
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  #14  
Old 03-09-2017, 06:09:59 PM
Max Thompson Max Thompson is offline
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Default Re: ONAN JB 7.5 new life

Quote:
Originally Posted by fisherman81654 View Post
Oil is not seeping from the gasket area that is visible maybe on the inside somehow. I haven't taken it off yet, just wanted to get some pointers first.It actually looks like its seeping out of that hole.
That is a pin that the pump pivots on. I have had "some" luck using a punch to expand the ends of the pin to stop the leak. My preferred option is to block off the mech. fuel pump and add an electric fuel pump.
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Old 03-09-2017, 06:54:22 PM
fisherman81654 fisherman81654 is offline
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Default Re: ONAN JB 7.5 new life

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Originally Posted by Max Thompson View Post
That is a pin that the pump pivots on. I have had "some" luck using a punch to expand the ends of the pin to stop the leak. My preferred option is to block off the mech. fuel pump and add an electric fuel pump.
What about applying a little jb weld in that hole for The JB ?
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Old 03-09-2017, 06:58:17 PM
Dale Russell Dale Russell is offline
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Default Re: ONAN JB 7.5 new life

Clean it GOOD with Acetone first. Might work!!!!!!!!!!
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Old 03-09-2017, 07:52:39 PM
fisherman81654 fisherman81654 is offline
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Default Re: ONAN JB 7.5 new life

Before I apply JB weld, does anyone have a parts breakdown picture for my fuel pump?
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Old 03-10-2017, 08:25:15 AM
stretch67 stretch67 is offline
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Default Re: ONAN JB 7.5 new life

Go with what Max says, make a block off plate for that old pump and put and electric pump on her.

If the old pump fails and fills crack case with gasoline that's a bad thing.

Lots of info on what electric pump to use on the forum here.
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Old 03-10-2017, 10:26:41 AM
Leon N. Leon N. is offline
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Default Re: ONAN JB 7.5 new life

I went out and took a picture of my JB fuel pump to see if it was leaking oil. Guess not. JB has been in operation since 1970. You may want to think twice about using an electric fuel pump WRT the mean time between failure (MTBF). Obviously you would want a high quality device.
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Old 03-10-2017, 10:49:24 AM
HBSaunders HBSaunders is offline
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Default Re: ONAN JB 7.5 new life

was about to bid on that one but was hoping to come up with a decent diesel, keeping my eyes open for one closer to home,howard
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