| Oil Filter Sandwich Plate O-Ring [message #324891] |
Fri, 13 October 2017 08:15  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Good morning
I need a replacement O-Ring that goes between the engine oil filter housing and the sandwich plate. Does anyone have a part number/source? I've tried using the rubber seal off of an oil filter but that ends up leaking.
Thanks
Ray Erspamer
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Oil Filter Sandwich Plate O-Ring [message #324928 is a reply to message #324892] |
Fri, 13 October 2017 21:46  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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Reading the info on this link is scary. It sounds like the oil will ALWAYS go through the relief and never be filtered or cooled. If this is the case, what's the solution???
http://www.gmcmhphotos.com/photos/455-403-engine-oil-flow-path/p53706-dorman-oil-filter-o-ri.html
This is what the one picture says....
1) By-pass valve - According to MM X-7525 the valve opens at 5.3 to 6.3 psi and returns uncooled and unfiltered oil to engine block
2) Oil cooler adapter and oil filter attachment fitting - returns cooled and filtered oil to engine.
3) Inlet from engine oil pump
When the by-pass opens the oil flow goes directly from the inlet port 3) to the by-pass valve 1) because it is the path of the least resistance (shown by the red arrow). The path through the oil cooler adapter, lines, oil cooler; and oil filter has more resistance.
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Oil Filter Sandwich Plate O-Ring [message #324929 is a reply to message #324928] |
Fri, 13 October 2017 22:53 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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That i to 6 pound pressure differential bets ONLY is there is a 5 or 6 pound pressure differential between the inlet and outlet. That should only occur if there is a clog in the filter, lines, or cooler. That bypass will save your engine from oil starvation. The only time that should occur is if you have a very dirty filter or very thick oil.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Oil Filter Sandwich Plate O-Ring [message #324934 is a reply to message #324891] |
Sat, 14 October 2017 08:27 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Ok, went thru this during the beginning of the summer and re-used a rubber gasket that was there. If I remember right, this gasket was more square and seemed to fit into a channel in the flange plate. Am I remembering right? So then I guess my question is , do I just add this o-ring between the flanges and then bolt it together with the filter stem sleeve bolt?
Tom Geiger
76 Eleganza II
KCMO
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| Re: Oil Filter Sandwich Plate O-Ring [message #324936 is a reply to message #324891] |
Sat, 14 October 2017 08:46 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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The oil filer ring works in a pinch to get you home. Pedantic Rob went into great detail to get to the bottom of this urban myth and explain the cold flow deformation and determine the correct part to use. I'm going with his research.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Oil Filter Sandwich Plate O-Ring [message #324963 is a reply to message #324936] |
Sun, 15 October 2017 10:27 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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JohnL455 wrote on Sat, 14 October 2017 08:46The oil filer ring works in a pinch to get you home. Pedantic Rob went into great detail to get to the bottom of this urban myth and explain the cold flow deformation and determine the correct part to use. I'm going with his research.
I used the Fram "square" O-ring for a few years and noted that when I changed oil, and took that cooler adaptor off to drain oil in the cooler, that the "Square" gasket was always slightly deformed at one particular location and leaked just a little at that spot. At one of the Greater Midwest Classics Rallys, I queried the great late Bob Drews about this. He said..."Well Larry, think about this a second. you've got a gasket from a filter that is usually coated with a little oil, designed to be spun on. The oil allows that to slide as it makes contact. You are using that gasket on an adaptor plate that is not being spun on...It is tightened in place straight on by the center bolt holding the adaptor in place, and no need to put oil on the gasket. So don't lubricate that gasket." So, I stoped putting a thin coat of oil on that gasket and have not had a deformation or leak since. Essentially treated it as if it were a "round" O-ring.
Just a note, a lot of people move the gasket from the oil filter that they are taking off, to the oil filter adaptor. I have found that the "Square" O-ring on the WIX 51258 does not fit on my oil cooler adaptor. That is why I buy and use JUST the "square"O-ring from the Fram filter. Put a new O-ring in about every 3-4 oil changes.
Just my relatively informed, off the cuff, back yard mechanic, gut level, eyeball it up and guestimate, way of doing things....that's all...
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Oil Filter Sandwich Plate O-Ring [message #324978 is a reply to message #324963] |
Sun, 15 October 2017 16:35 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Larry,
I agree 100% with what Bob said as well as what you've been doing since it works, however, why not just use a round o-ring that is
sized properly for the groove in the first place?
I personally did not come up with the size of the o-ring; I contacted engineers at Parker Hannifin and gave them the dimensions of
the groove and they provided me with that part number.
The red silicone o-ring from Dorman also works just as the dry Fram o-ring but the Parker Hannifin o-ring is sized properly and you
wind up with a metal to metal fit.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Larry
Sent: Sunday, October 15, 2017 11:27 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Oil Filter Sandwich Plate O-Ring
JohnL455 wrote on Sat, 14 October 2017 08:46
> The oil filer ring works in a pinch to get you home. Pedantic Rob went into great detail to get to the bottom of this urban myth
and explain the > cold flow deformation and determine the correct part to use. I'm going with his research.
I used the Fram "square" O-ring for a few years and noted that when I changed oil, and took that cooler adaptor off to drain oil in
the cooler, that the "Square" gasket was always slightly deformed at one particular location and leaked just a little at that spot.
At one of the Greater Midwest Classics Rallys, I queried the great late Bob Drews about this. He said..."Well Larry, think about
this a second. you've got a gasket from a filter that is usually coated with a little oil, designed to be spun on. The oil allows
that to slide as it makes contact. You are using that gasket on an adaptor plate that is not being spun on...It is tightened in
place straight on by the center bolt holding the adaptor in place, and no need to put oil on the gasket. So don't lubricate that
gasket." So, I stoped putting a thin coat of oil on that gasket and have not had a deformation or leak since.Essentially treated it
as if it were a "round" O-ring.
Just a note, a lot of people move the gasket from the oil filter that they are taking off, to the oil filter adaptor. I have found
that the "Square" O-ring on the WIX 51258 does not fit on my oil cooler adaptor. That is why I buy and use JUST the "square"O-ring
from the Fram filter. Put a new O-ring in about every 3-4 oil changes.
Just my relatively informed, off the cuff, back yard mechanic, gut level, eyeball it up and guestimate, way of doing
things....that's all...
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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