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GENERAL INFORMATION
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remaining portion of the screw or bolt. Drill a small hole in the screw and tap the extractor into the hole.
Back the screw out with a wrench on the extractor (Figure 38)
Repairing Damaged Threads
Occasionally, threads are stripped through
carelessness or impact damage. Often the threads
can be repaired by running a tap (for internal threads
on nuts) or die (for external threads on bolts) through
the threads (Figure 39). To clean or repair spark plug
threads, use a spark plug tap.
If an internal thread is damaged, it may be
necessary to install a Helical or some other type of
thread insert. Follow the manufacturer’s instructions when installing their insert.
If it is necessary to drill and tap a hole, refer to Table 8 for metric tap and drill sizes.
Stud Removal/Installation
A stud removal tool (Figure 40) is available from
most tool suppliers. This tool makes the removal and
installation of studs easier. If one is not available,
thread two must onto the stud and tighten them
against each other. Remove the stud by turning the
lower nut (Figure 41).
1. Measure the height of the stud above the
surface.
2. Thread the stud removal tool onto the stud and
tighten it, or thread two nuts onto the stud.
3. Remove the stud by turning the stud remover
or the lower nut.
4. Remove any thread locking compound from the
threaded hole. Clean the threads with an
aerosol parts cleaner.
5. Install the stud removal tool onto the new stud
or thread two nuts onto the stud.
6. Apply thread locking compound to the threads of the stud.
7. Install the stud and tighten with the stud
removal tool or the top nut.
8. Install the stud to the height noted in Step 1 or
its torque specification.
9. Remove the stud removal tool or the two nuts.
Removing Hoses
When removing stubborn hoses, do not exert
excessive force on the hose or fitting. Remove the
