Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
and a new valve installed using the oil flow check valve removal tool, J 38123 (if available) following the procedure outlined on page 6A7-48 in the
1989 "N" Service Manual.
If tool J38123 is not available, it will be necessary to fabricate a check valve removal tool using a 3/16x4 inch round head machine screw.
Modifying the Screw
IMPORTANT:
To aid in screw modification, it is recommended that a new checkvalve, part number 22548701 be used as a guide while performing the following two
steps.
1.
Parallel to the screwdriver slot, evenly grind both sides of the head of the screw until the screw head can be inserted into and past the two
indentations in the check valve.
2.
With the screw head inserted into check valve past the valve indentations as described in Step 1, rotate the screw 90 degrees to engage the screw
head under the indentations.
IMPORTANT:
If the screw cannot be rotated to engage the head under the valve indentations, very lightly grind the screw head outside diameter until the screw can be
rotated (with some friction).
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.
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.
Check Valve Ball Removal From Oil Galleries
The following procedures can be used (as required) to remove the check valve ball check from engine oil galleries.
These procedures (A through C) are listed in sequence and should be followed accordingly.
Procedure A
1.
Insert a narrow magnet (or screwdriver with a magnet on top of the screwdriver shank) into the check valve bore in the block.
2.
If magnet contacts ball check, ball can be removed.
Procedure B
