Home » Public Forums » GMCnet » Left exhaust manifold donut gasket
Left exhaust manifold donut gasket [message #283483] |
Wed, 29 July 2015 18:17 |
MikeT
Messages: 225 Registered: November 2009 Location: Marine City, Michigan
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Hello, I'm 800 miles from home in New England with a big left side donut gasket leak. Has anyone ever changed their donut without removing the exhaust manifold. I have a donut but don't want to risk breaking manifold bolts that were last removed over 5 years ago. hopefully the exhaust flange bolts don't break.
Also, is there a fuel filter for the onan 6000? Having fuel issues with tanks verified more then half full. I see the fuel pump and what I think is a check valve but no fuel filter.
Thanks
Mike Thomas
Marine City, MI
77 ex Palm Beach
[Updated on: Wed, 29 July 2015 18:18] Report message to a moderator
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Re: [GMCnet] Left exhaust manifold donut gasket [message #283486 is a reply to message #283483] |
Wed, 29 July 2015 18:27 |
Kingsley Coach
Messages: 2691 Registered: March 2009 Location: Nova Scotia Canada
Karma: -34
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Don't take the manifold off!!
Loosen the bolts at the exhaust/manifold joint and insert the donut . That
having been said, get a good fitting box end wrench or a 6point socket and
a can of good penetrating fluid....soak the bolt very well
If you break a bolt you'll need vice grips and a source of heat to remove
the stud. It can be replaced with 'ready rod' until you get home .
Others will likely add more to my answer...or have a different answer
Mike in NS
On Wed, Jul 29, 2015 at 8:17 PM, Thomas Mike wrote:
> Hello, I'm 800 miles from home in New England with big left side donut
> gasket leak. Has anyone ever changed their donut without removing the
> exhaust
> manifold. I have a donut but don't want to risk breaking manifold bolts
> that were last removed over 5 years ago. Hope the exhaust flange bolts don't
> break.
>
> Also, is there a fuel filter for the onan 6000? Having fuel issues with
> tanks verified more then half full. I see the fuel pump and what I think is
> a
> check valve but no fuel filter.
>
> Thanks
> --
> Mike Thomas
> Troy, MI
> 77 ex Palm Beach, 77 Royale (rear bath)
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
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Re: [GMCnet] Left exhaust manifold donut gasket [message #283490 is a reply to message #283483] |
Wed, 29 July 2015 18:39 |
powerjon
Messages: 2446 Registered: January 2004
Karma: 5
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Mike,
You DO NOT have to remove the exhaust manifold from the engine to change the donut out. Spray the bolts or studs at the exhaust manifold outlet with PB Blaster or similar and the remove them. The exhaust system will drop down enough to replace the donut. Put back together and drive on.
If you have the original Onan fuel pump the filter is in the bottom which will unscrew 1/4 to 1/2 turn, it has a screen inside and a rubber o-ring as a seal.
J.R. Wright
GMC Great Laker MHC
GMC Eastern States
GMCGL Tech Editor
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Jul 29, 2015, at 7:17 PM, Thomas Mike wrote:
>
> Hello, I'm 800 miles from home in New England with big left side donut gasket leak. Has anyone ever changed their donut without removing the exhaust
> manifold. I have a donut but don't want to risk breaking manifold bolts that were last removed over 5 years ago. Hope the exhaust flange bolts don't
> break.
>
> Also, is there a fuel filter for the onan 6000? Having fuel issues with tanks verified more then half full. I see the fuel pump and what I think is a
> check valve but no fuel filter.
>
> Thanks
> --
> Mike Thomas
> Troy, MI
> 77 ex Palm Beach, 77 Royale (rear bath)
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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Re: [GMCnet] Left exhaust manifold donut gasket [message #283492 is a reply to message #283490] |
Wed, 29 July 2015 18:58 |
Dennis S
Messages: 3046 Registered: November 2005
Karma: 2
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Mike
In my experience the donuts needed to be rotated and also tighten the three studs progressively to achieve a good seal.
Dennis
powerjon wrote on Wed, 29 July 2015 18:39Mike,
You DO NOT have to remove the exhaust manifold from the engine to change the donut out. Spray the bolts or studs at the exhaust manifold outlet with PB Blaster or similar and the remove them. The exhaust system will drop down enough to replace the donut. Put back together and drive on.
If you have the original Onan fuel pump the filter is in the bottom which will unscrew 1/4 to 1/2 turn, it has a screen inside and a rubber o-ring as a seal.
J.R. Wright
GMC Great Laker MHC
GMC Eastern States
GMCGL Tech Editor
GMCMHI
78 GMC Buskirk 30' Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Jul 29, 2015, at 7:17 PM, Thomas Mike wrote:
>
> Hello, I'm 800 miles from home in New England with big left side donut gasket leak. Has anyone ever changed their donut without removing the exhaust
> manifold. I have a donut but don't want to risk breaking manifold bolts that were last removed over 5 years ago. Hope the exhaust flange bolts don't
> break.
>
> Also, is there a fuel filter for the onan 6000? Having fuel issues with tanks verified more then half full. I see the fuel pump and what I think is a
> check valve but no fuel filter.
>
> Thanks
> --
> Mike Thomas
> Troy, MI
> 77 ex Palm Beach, 77 Royale (rear bath)
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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Re: [GMCnet] Left exhaust manifold donut gasket [message #283507 is a reply to message #283502] |
Thu, 30 July 2015 01:32 |
Dennis S
Messages: 3046 Registered: November 2005
Karma: 2
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Rob
The exhaust donuts (from NAPA) that I installed did not seal well but when I rotated them -- there was a "sweet spot" where they fit best between the manifold and the flare of the down pipe. The three attachment nuts should then be started and each brought down progressively (each a little at a time) to ensure they pull up the flare to the manifold.
Hopefully this is more clear.
Dennis
USAussie wrote on Wed, 29 July 2015 23:49Dennis,
Please explain.
Regards,
Rob M.
-----Original Message-----
From: Dennis Sexton
Mike
In my experience THE DONUTS NEEDED TO BE ROTATED and also tighten the three studs progressively to achieve a good seal.
Dennis
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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Re: Left exhaust manifold donut gasket [message #283524 is a reply to message #283483] |
Thu, 30 July 2015 08:51 |
lqqkatjon
Messages: 2324 Registered: October 2010 Location: St. Cloud, MN
Karma: 5
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Let us know how it turns out, The bolts will either come out or break... Lucky for me, Mine came out easily. That is the only thing that might make this a simple repair or a real pain.
I found the exhaust doughnuts hard to come by, and all parts shops in town needed to order them in. So it is good you have a spare Again, you should not need to remove the exhaust manifold, and if you remove the wheel liner, you will have easy access.
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: Left exhaust manifold donut gasket [message #283540 is a reply to message #283524] |
Thu, 30 July 2015 13:03 |
MikeT
Messages: 225 Registered: November 2009 Location: Marine City, Michigan
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Thanks to all for my donut change Success.
I drive without the inner wheel liners so a clear shot. Although I went through the engine compartment for the left side donut. I lubed up real good with PB blaster last night. Gave it another lube this morning. Crossed my fingers and closed my eyes as I started to back off flange bolts. Both came off pretty good without much struggle. Plenty of room to put new donut in after loosening/removing two bolts ;I only have two bolts not three on the 77 455. The donut I removed was stripped bare of insulation material. Much quieter now with the exception of a smaller leak front of left manifold.
The Donut I used was the rounded type. Bought at a Michigan auto parts store a few months back for $17.
Without all your advice, I probably would not have attempted this on the road and put up with the extra noise all the way home.
Thanks again
Mike Thomas
Marine City, MI
77 ex Palm Beach
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Re: Left exhaust manifold donut gasket [message #283543 is a reply to message #283483] |
Thu, 30 July 2015 13:17 |
lqqkatjon
Messages: 2324 Registered: October 2010 Location: St. Cloud, MN
Karma: 5
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glad to hear, and from my recent experience, better to tackle it now, even on the road.
I had one exhaust manifold gasket go bad, and i put alot of miles on it, without it getting much worse. The last one I had fail, I put about 100 miles on and it got way worse, to a point I was worried about other issues, and I was forced to change it on the road, when it was HOT! I had the opportunity to change it when it was cold at the start of the day, but thought I could make it home.
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: Left exhaust manifold donut gasket [message #283559 is a reply to message #283540] |
Thu, 30 July 2015 17:29 |
Dennis S
Messages: 3046 Registered: November 2005
Karma: 2
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Mike
Well done -- thanks for the feedback.
Correction -- Somehow I kept saying three studs but as you pointed out there are only two.
Dennis
MikeT wrote on Thu, 30 July 2015 13:03Thanks to all for my donut change Success.
I drive without the inner wheel liners so a clear shot. Although I went through the engine compartment for the left side donut. I lubed up real good with PB blaster last night. Gave it another lube this morning. Crossed my fingers and closed my eyes as I started to back off flange bolts. Both came off pretty good without much struggle. Plenty of room to put new donut in after loosening/removing two bolts ;I only have two bolts not three on the 77 455. The donut I removed was stripped bare of insulation material. Much quieter now with the exception of a smaller leak front of left manifold.
The Donut I used was the rounded type. Bought at a Michigan auto parts store a few months back for $17.
Without all your advice, I probably would not have attempted this on the road and put up with the extra noise all the way home.
Thanks again
Dennis S
73 Painted Desert 230
Memphis TN Metro
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