Engine Block Plugs

Special Service Tool Required:

To remove a large core plug, drill a 12.70 mm (1/2-inch) hole in the center of the plug and remove with Impact Slide Hammer 307-005 (T59L-100-B) or 100-00 1 (T50T-1 00-A). Clean and inspect the plug bore.
Inspect the plug bore before installation for any damage that would interfere with the proper sealing of the plug. If the bore is damaged, true-up the surface by boring for the next specified oversize plug.
Oversize plugs are identified by the "OS" stamped in the flat located on the cup side of the plug.
Coat the plug and/or bore lightly with an oil resistant (oil galley) Stud and Bearing Mount EOAZ-19554-BA or equivalent meeting Ford specification WSK-M2G349-A1 or Threadlock 262 E2FZ-19554-B or equivalent meeting Ford specification WSK-M2G351-A6. Install the plug following the procedure for cup-type or expansion-type as listed below:





Cup-Type
Cup-type core plugs are installed with the flanged edge outward. The maximum diameter is located at the outer edge of the flange. The flange on cup-type plugs flares outward with the largest diameter at the outer (sealing) edge.

CAUTION: It is imperative to push or drive the plug into the machined bore by using a properly designed tool. Do not drive the plug into the bore using a tool that contacts the flange. This will damage the sealing edge and result in leakage and/or plug blowout.

NOTE: If the core plug replacing tool has a depth seating surface, do not seal the tool against a non-machined (casting) surface.

When installed, the flanged (trailing) edge must be below the chamfered edge of the bore to effectively seal the plugged bore.





Expansion-Type
Expansion-type core plugs are installed with the flanged edge inward. The maximum diameter of this plug is located at the base of the flange with the flange flaring inward.

CAUTION: Install or drive the plug into the machined bore by using a properly designed tool. Do not drive the plug using a tool that contacts the crowned portion of the plug. This will expand the plug prior to installation and may damage the plug and/or plug bore.

When installed, the trailing (maximum) diameter must be below the chamfered edge of the bore to effectively seal the plugged bore.

CAUTION: Install the plug into the machined bore by using a properly designed tool. Under no circumstances is the plug to be driven into the bore using a tool that contacts the flange. This will damage the sealing edge and will result in leakage and/or plug blowout.

NOTE: If the core plug replacing tool has a depth seating surface, do not seat the tool against a non-machined (casting) surface.

When installed, the flanged (trailing) edge must be below the chamfered edge of the bore to effectively seal the plugged bore.