[Custom455]

I want to replace the bypass spring in the oil filter housing.

Does anyone know what it is supposed to be pressure wise, so maybe I could just pick it up from the local hardware store?

If not what is a good source to get a new spring?

[Schurkey]

I'd be looking for a different adapter rather than a replacement spring.

The spring won't be very stiff. I think the bypass opens at about 5--7 PSI differential between filter inlet and outlet.

[PurplePackFan]

Needed to resurrect this thread as I need to replace my spring also. While preparing to assemble my 428 I decided to get the husing out of the box of parts and clean it and get it ready to install and paint. Upon dissassembly the spring came out in pieces and full of old gunk. Did you ever find a new spring? I'd hate to buy a new housing just to replace a $0.50 spring. Any help appreciated.

John

[gto406]

My spring (for my GTO) is okay, I lost the damn bolt when I put it in some cleaning solvent!

I re-tapped the bolt hole (#10-32 machine screw with a phillips head) which worked. I put some 'red' Loctite on it, and re-installed with the retainer, spring, and the little pad/gasket.

My question: should the retainer/screw have a little 'play' in it, or be rigidly bolted down? I initially had no play, and backed off the screw a bit (to get some).

Not entirely sure how this mechanism works. My assumption is that somehow (I guess when pressure builds up) the oil will push against the gasket/spring but it shouldn't push it enough that the gasket comes out, correct?

Any advice appreciated. They don't seem to have anything written about this in the service manual. I also don't have any other info in any of my books (Jim Hand's or the McCarthy books).

Thanks!

[Bluesugar]

It used to be recommended to tap and plug where that spring went and use a 2 stage oil filter so you would never circulate unfiltered oil,...I just wonder if that thought process has become passe?

[Bruce Meyer]

Originally Posted by gto406

My spring (for my GTO) is okay, I lost the damn bolt when I put it in some cleaning solvent!

I re-tapped the bolt hole (#10-32 machine screw with a phillips head) which worked. I put some 'red' Loctite on it, and re-installed with the retainer, spring, and the little pad/gasket.

My question: should the retainer/screw have a little 'play' in it, or be rigidly bolted down? I initially had no play, and backed off the screw a bit (to get some).

Not entirely sure how this mechanism works. My assumption is that somehow (I guess when pressure builds up) the oil will push against the gasket/spring but it shouldn't push it enough that the gasket comes out, correct?

Any advice appreciated. They don't seem to have anything written about this in the service manual. I also don't have any other info in any of my books (Jim Hand's or the McCarthy books).

Thanks!

TIGHT!!!!!!!!

[Skip Fix]

I think I saw a couple of those when I was going through some parts last week. Not sure their tension I know my valve spring machine couldn't measure them as they are too light.

[gto406]

Originally Posted by Bruce Meyer

TIGHT!!!!!!!!

Thanks Bruce, I will re-tighten that sucker down. Glad I checked before re-installing.

BR/Brian.

[gtofreek]

I block them off. You need to be religious about changing your oil and filter though, if you do.
I have a spring, bolt and fiber pad, if anyone needs them.

[Bluesugar]

I've been doing that for over 30 years now(that's why I brought it up),...My copy of "Pontiac High Performance engine design & blueprint assembly"(circa 1979, by Craig Hendrickson & Kern Osterstock, H-O Racing Specialties,Inc.) details this function,...You must be sure to use a 2-stage filter though after this mod,..Lee Maxi-Filter was the choice at the time(I bought 4 case's of them years ago and have only 6 left!!!),...STP was another if my memory works anymore

[Schurkey]

What is a two-stage filter?

[rod cole]

Most quality filters have a bypass built into them. So the factory bypass is really redundent. Most filter sights say whether a filter number has a built in bypass. Or cut apart the planed filter you will use and if it has a means for the filter media to move down in the housing like a spring or a piece of spring steel under it . It will bypass if the filter clogs or is out ran by pressure. But if you allow the engine to warm up and change the oil regularly the filter bypass really never does anything. So plug it buy a filter with a built in bypass and forget about it. Rod

[PurplePackFan]

Paul, aka "GTOFREAK", hooked me up with a spring and check valve. Very cool!! Thanks a bunch, I am on way to completing assembly...

[gtofreek]

Your welcome!