Ford Explorer, Maintaince And Repair Manual, Page: 457 / 1119

Screw the insert onto the installer tool until the tang engages the slot. Thread the insert into the
hole until it is
1
/
4
−
1
/
2
turn below the top surface, then remove the tool and break off the tang
using a punch
Several methods of repairing damaged threads are available. Heli−Coil® (shown here), Keenserts® and
Microdot® are among the most widely used. All involve basically the same principle−drilling out stripped
threads, tapping the hole and installing a prewound insert−making welding, plugging and oversize fasteners
unnecessary.
Two types of thread repair inserts are usually supplied: a standard type for most inch coarse, inch fine, metric
course and metric fine thread sizes and a spark lug type to fit most spark plug port sizes. Consult the
individual tool manufacturer's catalog to determine exact applications. Typical thread repair kits will contain a
selection of prewound threaded inserts, a tap (corresponding to the outside diameter threads of the insert) and
an installation tool. Spark plug inserts usually differ because they require a tap equipped with pilot threads and
a combined reamer/tap section. Most manufacturers also supply blister−packed thread repair inserts separately
in addition to a master kit containing a variety of taps and inserts plus installation tools.
Before attempting to repair a threaded hole, remove any snapped, broken or damaged bolts or studs.
Penetrating oil can be used to free frozen threads. The offending item can usually be removed with locking
pliers or using a screw/stud extractor. After the hole is clear, the thread can be repaired as shown in the kit
manufacturer's instructions.
Engine Preparation
To properly rebuild an engine, you must first remove it from the vehicle, then disassemble and diagnose it.
Ideally you should place your engine on an engine stand. This affords you the best access to the engine
components. Remove the flywheel or flexplate before installing the engine to the stand.
Now that you have the engine on a stand, and assuming that you have drained the oil and coolant from the
engine, it's time to strip it of all but the necessary components. Before you start disassembling the engine, you
HOW TO USE THIS BOOK
Engine Preparation 451