Onan Front Seal [message #278159] |
Thu, 21 May 2015 17:19 |
jtfred
Messages: 132 Registered: January 2015 Location: Grand Marais, MN
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Now that I have my onan starting and running OK, it has spring an oil leak. I ran it for about 30 minutes today and ended up with a good sized oil puddle under it. There was no indication of a leak yesterday.
I haven't removed any of the covers yet, but I suspect that it is a front oil seal. How significant of a job is it to replace this oil seal? How much time will it take me?
Thanks,
John
Fayetteville, GA
1978 Eleganza
John Fredrikson
Grand Marais, MN
1978 Eleganza
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Re: [GMCnet] Onan Front Seal [message #278160 is a reply to message #278159] |
Thu, 21 May 2015 17:50 |
George Zhookoff
Messages: 398 Registered: December 2004 Location: Snellville, GA
Karma: 6
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Check the low oil pressure switch before digging into other stuff. They tend to leak when the generator is running. Also oil filter mount gaskets, yes there are 2.
George Zhookoff
78 EL II
Atlanta
> On May 21, 2015, at 6:19 PM, "John Fredrikson" wrote:
>
> Now that I have my onan starting and running OK, it has spring an oil leak. I ran it for about 30 minutes today and ended up with a good sized oil
> puddle under it. There was no indication of a leak yesterday.
>
> I haven't removed any of the covers yet, but I suspect that it is a front oil seal. How significant of a job is it to replace this oil seal? How much
> time will it take me?
>
> Thanks,
>
> John
> Fayetteville, GA
> 1978 Eleganza
> --
> John Fredrikson
> Fayetteville, GA
> 1978 Eleganza
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Re: [GMCnet] Onan Front Seal [message #278166 is a reply to message #278160] |
Thu, 21 May 2015 19:10 |
jtfred
Messages: 132 Registered: January 2015 Location: Grand Marais, MN
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I will check those.
Thanks,
John
George Zhookoff wrote on Thu, 21 May 2015 18:50Check the low oil pressure switch before digging into other stuff. They tend to leak when the generator is running. Also oil filter mount gaskets, yes there are 2.
George Zhookoff
78 EL II
Atlanta
> On May 21, 2015, at 6:19 PM, "John Fredrikson" wrote:
>
> Now that I have my onan starting and running OK, it has spring an oil leak. I ran it for about 30 minutes today and ended up with a good sized oil
> puddle under it. There was no indication of a leak yesterday.
>
> I haven't removed any of the covers yet, but I suspect that it is a front oil seal. How significant of a job is it to replace this oil seal? How much
> time will it take me?
>
> Thanks,
>
> John
> Fayetteville, GA
> 1978 Eleganza
> --
> John Fredrikson
> Fayetteville, GA
> 1978 Eleganza
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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John Fredrikson
Grand Marais, MN
1978 Eleganza
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Re: Onan Front Seal [message #278167 is a reply to message #278159] |
Thu, 21 May 2015 19:19 |
lqqkatjon
Messages: 2324 Registered: October 2010 Location: St. Cloud, MN
Karma: 5
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Senior Member |
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I think it is a pretty easy job... as long as you have the right puller for the flywheel.(easily found)
couple pictures here:
http://lqqkatjon.blogspot.com/search?q=onan+repair
the other trick is getting the old seal out carefully. there are some tricks on that too. I drilled a couple holes and pulled it out using a homemade rod/hook, being really careful to vacuum the metal filings and using some grease.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Re: Onan Front Seal [message #278168 is a reply to message #278159] |
Thu, 21 May 2015 19:26 |
Tilerpep
Messages: 404 Registered: June 2013 Location: Raleigh, NC
Karma: 7
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Been learning/fixing mine in recent weeks...due to a sudden pronounced leak. One experienced owner told me the amount I was losing indicated pressure leak - which would most likely be the oil pressure sender or oil filter mount gaskets (both on side of gen to the rear of coach). The front seal does not have the same pressure apparently. Mine was profuse and the fan was blowing it down the front so I thought the front seal was bad. Turned out to be oil pressure cutoff switch (leaking through the sender, not from where it threaded in), and it got worse the longer it ran (oil thinned with heat?). Changed the switch, all fine.
To check and tighten the two bolts that hold the oil filter mount, the best tip I found on the forum archives was to use what is called a distributor wrench to reach the bolts. I picked one up for $5. You have to remove the side cover to do the two bolts and oil pressure sender. The flywheel and several covers are removed to do the front seal.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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Re: Onan Front Seal [message #278174 is a reply to message #278168] |
Thu, 21 May 2015 20:50 |
Ken Burton
Messages: 10030 Registered: January 2004 Location: Hebron, Indiana
Karma: 10
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I had an Onan oil leak. It was blowing oil out of the air cooling vent at the bottom of the generator. I diagnosed it as a bad front seal and ordered one. A year later I pulled the flywheel and the front seal was fine. My leak was the mounting bolts for the oil filter adapter. (A five minute fix.)
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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Re: Onan Front Seal [message #278176 is a reply to message #278168] |
Thu, 21 May 2015 21:08 |
jtfred
Messages: 132 Registered: January 2015 Location: Grand Marais, MN
Karma: 0
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My leak sounds much like what you and Ken are describing. Profuse leak spraying out of the fan. I will have to pull the side cover and see if I can track it down. I'm hoping that is all it is.
Thanks!
John
Tilerpep wrote on Thu, 21 May 2015 20:26Been learning/fixing mine in recent weeks...due to a sudden pronounced leak. One experienced owner told me the amount I was losing indicated pressure leak - which would most likely be the oil pressure sender or oil filter mount gaskets (both on side of gen to the rear of coach). The front seal does not have the same pressure apparently. Mine was profuse and the fan was blowing it down the front so I thought the front seal was bad. Turned out to be oil pressure cutoff switch (leaking through the sender, not from where it threaded in), and it got worse the longer it ran (oil thinned with heat?). Changed the switch, all fine.
To check and tighten the two bolts that hold the oil filter mount, the best tip I found on the forum archives was to use what is called a distributor wrench to reach the bolts. I picked one up for $5. You have to remove the side cover to do the two bolts and oil pressure sender. The flywheel and several covers are removed to do the front seal.
John Fredrikson
Grand Marais, MN
1978 Eleganza
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Re: Onan Front Seal [message #278178 is a reply to message #278176] |
Thu, 21 May 2015 21:36 |
Ken Burton
Messages: 10030 Registered: January 2004 Location: Hebron, Indiana
Karma: 10
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John, Just check the oil filter adapter mounting bolts and see that they are tight. Then closely check the pressure switch and the oil filter itself. I was convinced that my front seal was bad when it was not.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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Re: Onan Front Seal [message #278181 is a reply to message #278178] |
Thu, 21 May 2015 22:41 |
Bob de Kruyff
Messages: 4260 Registered: January 2004 Location: Chandler, AZ
Karma: 1
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Ken Burton wrote on Thu, 21 May 2015 20:36John, Just check the oil filter adapter mounting bolts and see that they are tight. Then closely check the pressure switch and the oil filter itself. I was convinced that my front seal was bad when it was not.
The front leaks I have had were the oil pressure switch and the governor housing bolts. Pulling the flywheel will lead you to the leak--none of the front leaks are difficult to fix.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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Re: Onan Front Seal [message #278186 is a reply to message #278159] |
Fri, 22 May 2015 07:05 |
midlf
Messages: 2212 Registered: July 2007 Location: SE Wisc. (Palmyra)
Karma: 1
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First and easiest thing to check: Is your oil filter tight? Please don't ask how I know this. The fan will blow the oil around so much you may think everything is leaking.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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Re: Onan Front Seal [message #278203 is a reply to message #278159] |
Fri, 22 May 2015 15:41 |
jtfred
Messages: 132 Registered: January 2015 Location: Grand Marais, MN
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I pulled the side shroud and checked the filter and the adapter bolts. They were OK. Started the generator and no leaking at first after the engine warmed up, the oil pressure switch started flowing. I was able to get a replacement from Napa and I am back in business.
Thanks for all of your help!!!!!
John
John Fredrikson
Grand Marais, MN
1978 Eleganza
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