Oil pressure relief valve

[Sasquatch]

Can anyone tell me the part #'s for the spring and ball or whatever is used in an older 258 where the valve is a part of the oil filter connection housing?

[GeeAea]

I'm curious when this was done. My HV pump on my 4.0 is the same part number as one for a 4.2. They didn't even offer it for the 4.0 under this aftermarket supplier's catalog. It's relief is in the pump.

A 240/300 Ford truck block uses accessible relief, iirc.

[Sasquatch]

Well I found some information here:
AMC* Engine Information


OIL FILTER REPLACEMENT CAUTION ON AMC 4.2L ENGINES

Oil Filter Replacement Caution on
Chrysler (AMC) 4.2L (258 CID) Engines

Chrysler Corporation cautions on the replacement of oil filters on 4.2L (258 CID) AMC built engines.

Engines built prior to 1987 utilize an oil filter without internal bypass architecture. A bypass valve is necessary to provide adequate lubrication to the engine should the oil filter become clogged. Engines using this style filter have a bypass valve assembly built into the cylinder block (see illustration).
This earlier filter design features a .813 connector thread.

Engines built during and after 1987 do not have the built-in bypass assembly and therefore utilize a filter assembly containing the bypass valve. The later model filter design features a 20mm (.787) connector thread.

Do not use the earlier style filter on engines built during and after the 1987 model year. Incorrect filter application may result in serious engine damage.

The AERA Technical Committee

So I guess I'm looking for the bypass valve parts.

[GeeAea]

Oh ..the "Chevy" days at Jeep. I see. Followed by the metric thread jeeps.




I seem to recall something like 7-11lbs. That would fall into most filter medias tolerance for PSID.

[GeeAea]

Can't you order this from Jeg's??