Service manual

181 CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
90-861329--1 MARCH 1999 Page 3A-69
Oil Filter By-Pass Valve
Inspection and/or Replacement
With oil filter removed, check spring and fiber valve for operation. Inspect for a cracked or
broken valve. If replacement is necessary, pry valve out with screwdriver. Install and seat
a new valve by tapping in place with a 9/16 in. thin wall deep socket.
Refer to “Engine Parts List” when ordering parts for oil filter by-pass valve.
1. Remove oil filter from cylinder block and remove by-pass valve.
2. Clean by-pass valve in solvent and blow dry with compressed air.
3. Inspect fiber valve for cracks or other damage. Check that valve fits tightly against its
seat. Push valve down and release it. Valve should return freely to its seat. If valve
operation is questionable, by-pass valve should be replaced.
72912
a
Typical By-Pass Valve
a-Fiber Valve (Ensure Valve Fits Tightly Against the Seal)
4. Wipe out valve chamber in cylinder block to remove any foreign material.
5. Install by-pass valve or cylinder block adaptor to engine block.
6. Lubricate oil filter rubber seal and install hand-tight only.
Index