Oil Flow Check Valve Removal Using Modified Screw:

1. Remove cylinder head. Refer to the Service Manual section.

2. Carefully soak up any oil remaining in the check valve with shop or paper towel.

3. Carefully insert the modified screw head into the check valve past the indentations. Rotate screw 90 degrees to engage the screw head under valve indentations. Refer to Figure 3.

Notice:

Use care not to let the modified screw head impact the ball check in the valve. Impact could cause the ball check to disengage from the valve allowing it to drop into the engine oil galleries.

4. Use a slide hammer or other suitable tool on the threaded end of the modified screw to pull the check valve from its bore.

IMPORTANT:

If the ball check is missing from the valve when removed, it must be located and removed from the engine prior to installation of a new check valve. If the ball is not removed from the engine and the engine is started, a "no engine oil pressure" condition will likely result. Refer to "Check Valve Ball Removal From Oil Galleries" procedure in this bulletin.

Installation:

1. Place new check valve, part number 22548701 into valve bore in block.

2. Use appropriate size socket or flat nose punch to drive valve. Lightly tap socket/punch to seat valve in bore.

IMPORTANT:

When tapping socket or punch to seat valve in bore, there will be a distinct change of sound as valve seats. A properly seated valve check should not protrude above the top of the block surface and should be slightly below it.