F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Expansion/Freeze Plug: Service and Repair
REMOVAL
To remove a large core plug, drill a 12.70 mm (1/2-inch) hole in the center of the plug and remove with an Impact Slide Hammer T59L-100-B or
T50T-100-A or pry it out with a large drift punch. On a small core plug, drill a 6.35 mm (1/4-inch) hole in the center of the plug and pry it out with a
small pin punch. Clean and inspect the plug bore
INSTALLATION
Prior to installing a core plug, the plug bore should be inspected for any damage that would interfere with the proper sealing of the plug. If the bore is
damaged, it will be necessary to true the surface by boring for the next specified oversize plug.
Oversize plugs are identified by the OS stamped in the fiat 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 262E2FZ-19554-B or equivalent meeting Ford specification WSK-M2G351-A6, and install it following the
procedure for cup-type or expansion-type below:
Cup-Type
Cup-type core plugs are installed with the flanged edge outward. The maximum diameter of this plug is located at the outer edge of the flange. The
flange on cup-type plugs flare outward with the largest diameter of the outer (sealing) edge.
Expansion Type
CAUTION: It is imperative to push or drive the plug into the machined bore using a properly designed tool. Do not drive the plug using a tool that
contacts the crowned portion of the plug. This method will expand the plug prior to installation and can damage the plug and plug bore.
Expansion-type core plugs are installed with the flange edge inward. The maximum diameter of this plug is located at the base of the flange with the
flange flaring inward.
When installed, the trailing (maximum) diameter must be below the chamfered edge of the bore to effectively seal the plugged bore.
If the core plug replacing tool has a depth seating surface, do not seat the tool against a nonmachined (casting) surface.
