Oil filter base leak

[powwerjon]

Bob Drews was a true gentleman and thinker and I do Miss him. Great at the lairs table too!

Granted that the oil seal is a square type rubber seal rings and works well for all the millions of filters used each year. The common practice, even by me over the years is to remove that rubber seal ring and use it to replace the rubber seal/O-ring on the oil filter adapter to the engine. There are a number of O-rings that can also be used in that application too. I changed my square type seal every time that I did an oil change.

http://www.gmcmhphotos.com/photos/455-2f-403-engine-oil-flow-path/p53706-dorman-oil-filter-o-ring-kit.html

This was researched and tested by Rob M and works well and I have also used it.

There are many options available, the choice can be yours.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

>
> I certainly do miss Bob Drewes. So knowledgeable and plain spoken. Used common sense to great advantage. Never boasted or built himself up.
> A true mentor for many of us.
> Only thing was his opinion on ethanol in fuel mandate and a certain shade of green. haha But that was good natured.
>
> May he rest in eternal peace.
>
> bdub
>
>
> -----Original Message-----
> From: Larry via Gmclist
> Sent: Monday, June 22, 2020 7:37 AM
> Subject: Re: [GMCnet] Oil filter base leak
>
> When I first started this GMC thing the Oil filter o ring was the only thing we had and was being recommended by everyone in the know. I had some
> leak issues. Got to talking with the great Bob Drews about the o ring and how it squashes out and leaks. He said…”Larry, think about that o ring
> and what it was designed for on the oil filter. It is a spin on and slides on contact for half a turn. You put a little oil on it so it slides to
> tighten. Your hands don’t have near the torque that a wrench has when tightening the filter adapter. And the oil filter adapter just tightens
> straight down with no twist and no oil on the o ring. So when you use the oil filter o ring, don’t oil it down. Put it in and tighten down dry.”
> So that is what I’ve been doing ever since. Never a leak. JWID
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[Carl Stouffer]

My experience was the same as Larry's and ken's. When I did my engine rebuild, I used the recommended O-ring. It did not leak for the first few oil
changes, but then it started to leak. I replaced it with a gasket ring from a Purolator filter, installed it dry, torqued it to spec, and I'm hoping
I won't have any more issues with it.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging. GMCSJ and GMCMI member

 

[johnny]

On the cooler adapter the O ring was original, but it's simple enough to stick the top gasket off the old filter under there. That's what sealed the
filter to the block adapter on ever 455 that didn't have a cooler, and why folks find square ones there.

As to the gasket, JumK has them as does Advance if you take the adapter in for them to match. If you're in a rush there's a quick n dirty fix. Get a
square of heavy gasket paper, set it on the adapter, and peen it with the ball on a ball peen hammer which will score the openings. Take your
X-acto knife and cut along the lines, being careful. Voila! Gasket.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell

 

[Ken B]

It works and has worked for people for 40+ years. Why fight it? If you use the round one then the two pieces end up flat against each other. I
believe the o-ring is not quite thick enough, so it leakes over time. On the square one you removed from the oil filter when installed and torqued
it leaves about a 1/16" gap between the two pieces so you know the pressure is all being applied to the square o-ring. I imagine that it could
flatten out some more over time. That is why I suggest that you re-torque it on the next two oil changes.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[powwerjon]

Ken,

I am going to agree and disagree here on the o-ring seals.

The semi-square seal that you remove from the Oil Filter at oil change time has and is a perfect seal to use to use on the adapter. There are many GMC owners that are or were unaware that the seal needed to be replaced. My rule was that I changed it every other oil change at about 3 or 4 k miles of usage. The black rubber seal gets hard and then can be prone to leak, look at the last picture in the album to see the deformed oil filter gasket and leads to a leak. I also torque the adapter to 55 Ft/Lbs when reinstalling. I have also used the o-ring seal and have had NO oil leaks with it too and I have changed it after the 2nd oil change too.

Rob Mueller did a excellent research test and presentation on the seals that are available and what we used and how they perform.

This is the link to the album, look at the whole thing and read the captions, lots of information there!

http://www.gmcmhphotos.com/photos/g6677-oil-filter-base-to-oil-cooler-adapter-sealing.html

The presentation is that there are several way to have a seal on the oil filter adapter.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

>
> It works and has worked for people for 40+ years. Why fight it? If you use the round one then the two pieces end up flat against each other. I
> believe the o-ring is not quite thick enough, so it leakes over time. On the square one you removed from the oil filter when installed and torqued
> it leaves about a 1/16" gap between the two pieces so you know the pressure is all being applied to the square o-ring. I imagine that it could
> flatten out some more over time. That is why I suggest that you re-torque it on the next two oil changes.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org