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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old March 2nd, 2024, 06:54 PM
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Default Oil Filter Adapters

I've been on our forum since Jolly started it in January 2000. But I don't remember this topic being discussed before. So I'm looking for some advice.

I'm replacing the original oil filter adapter on the 351C in my '65 Suburban. The first photo shows the side of the engine where the filter adapter mounts.
The next two photos show the "old fashioned" original style adapter for the canister style oil filter with the replaceable element in it. As most of you know, these filters are messy to replace at oil change time. So I'm installing the spin-on style adapter which was introduced in 1966. These make changing the filter a breeze in comparison. The fourth and fifth photos show this adapter.

In the fifth photo you'll see a little spring-loaded check valve. I assume this is to help prevent oil drain-back when the engine is off. Unfortunately, one of the adapters I have has this valve installed the other way, protruding into the cavity at the top of the filter. So, I have two questions: 1. Which is the correct way to install it, and 2. Is this check valve even necessary? The original filter adapter I removed doesn't have a check valve at all. I don't want to install it backwards and prevent oil from flowing through the filter.

Just for information purposes, the last three photos show different filter adapter gaskets from some of the gasket sets I've bought over the years.
Attached Images
File Type: jpg IMG_0339.JPG (3.86 MB, Multiple views, 2 clicks)
File Type: jpg IMG_0340.JPG (1.99 MB, Multiple views, 1 clicks)
File Type: jpg IMG_0341.JPG (2.02 MB, Multiple views, 1 clicks)
File Type: jpg IMG_0334.JPG (1.66 MB, Multiple views, 1 clicks)
File Type: jpg IMG_0333.JPG (2.57 MB, Multiple views, 2 clicks)
File Type: jpg IMG_0335.JPG (2.81 MB, Multiple views, 1 clicks)
File Type: jpg IMG_0336.JPG (2.49 MB, Multiple views, 1 clicks)
File Type: jpg IMG_0337.JPG (2.67 MB, Multiple views, 2 clicks)
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  #2  
Old March 2nd, 2024, 07:16 PM
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Default Re: Oil Filter Adapters

hello, ed. maybe i can be of help. the valve you are seeing is a bypass valve. your original housing also has one under the large hex shaped nut on the outside of the housing. as far as the gasket to use, take the housing you want to use and match the gasket to it. that is the reason full gasket sets come with 3-4 different housing gaskets. it looks like you have found the "Pontiac" version of the housing, using a AC/Delco PF24. i hope that this info has been of some help. as far as the position of the valve, take some compressed air and blow through the valve and see which direction that the valve opens. as this is a "bypass valve" it will open up when the filter is restricting due to being clogged.
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Last edited by LEWISMATKIN; March 2nd, 2024 at 07:22 PM.
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  #3  
Old March 3rd, 2024, 12:15 AM
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Default Re: Oil Filter Adapters

I purchased a spin on unit that had that valve missing. I read here on this forum to use this one.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I've updated two engines with the valve in that position.



I had posted a photo of a gasket used, but was not sure if correct, so defer to Lewis Matkin's advice
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File Type: jpg IMG_2933.JPG (892.3 KB, Multiple views, 0 clicks)
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Last edited by Funky61; March 3rd, 2024 at 12:20 AM. Reason: information may be incorrect on gasket
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Old March 3rd, 2024, 12:32 AM
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Default Re: Oil Filter Adapters

Gasket numbered 70363 was the correct one
Attached Images
File Type: jpeg IMG_1686.jpeg (2.57 MB, Multiple views, 2 clicks)
File Type: jpeg IMG_1687.jpeg (2.33 MB, Multiple views, 2 clicks)
File Type: jpeg IMG_1688.jpeg (1.89 MB, Multiple views, 1 clicks)
File Type: jpeg IMG_1690.jpeg (2.12 MB, Multiple views, 1 clicks)
File Type: jpeg IMG_1689.jpeg (2.39 MB, Multiple views, 0 clicks)
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Last edited by Funky61; March 3rd, 2024 at 03:39 AM. Reason: correct number
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Old March 3rd, 2024, 07:22 AM
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Default Re: Oil Filter Adapters

Quote:
Originally Posted by Funky61 View Post
Gasket numbered 70363 was the correct one
Thanks for the info and the photos, Funky!
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Old March 3rd, 2024, 07:24 AM
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Default Re: Oil Filter Adapters

Quote:
Originally Posted by LEWISMATKIN View Post
hello, ed. maybe i can be of help. the valve you are seeing is a bypass valve. your original housing also has one under the large hex shaped nut on the outside of the housing. as far as the gasket to use, take the housing you want to use and match the gasket to it. that is the reason full gasket sets come with 3-4 different housing gaskets. it looks like you have found the "Pontiac" version of the housing, using a AC/Delco PF24. i hope that this info has been of some help. as far as the position of the valve, take some compressed air and blow through the valve and see which direction that the valve opens. as this is a "bypass valve" it will open up when the filter is restricting due to being clogged.
Thanks for the explanation, Lewis. You've confirmed my suspicions!
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Old March 4th, 2024, 03:17 AM
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Default Re: Oil Filter Adapters

There are actually 2 different spin-on oil filter adapters for the V-6. The one 'Funky61' is the 'Pontiac' style as Lewis Matkin pointed out. It uses a PF24 oil filter, same as a Pontiac V-8. I believe the GM part # for this adapter is 662066. The other type of spin-on oil filter adapter uses a Chevy type PF35 oil filter. That type of adapter is very rare and appears to have been used on '73 and '74 379 and 432 V-6's. I don't have a part number for that one.
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Old March 4th, 2024, 05:05 AM
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Default Re: Oil Filter Adapters

https://6066gmcclub.com/album.php?albumid=63

I'm not sure who posted this album, but it shows the other type that Bob Bray mentioned.
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Old March 4th, 2024, 06:13 AM
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Default Re: Oil Filter Adapters

Quote:
Originally Posted by Funky61 View Post
https://6066gmcclub.com/album.php?albumid=63

I'm not sure who posted this album, but it shows the other type that Bob Bray mentioned.
Those photos are great, Funky! I'd sure be curious to know where Jeannie got them 11 years ago.
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Old March 4th, 2024, 12:04 PM
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Default Re: Oil Filter Adapters

This is what I did to get a spin on oil filter.
https://6066gmcclub.com/showthread.php?t=51141

The machine shop charged me $850 to make both pieces.
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