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INSTRUCTIONS
This is not recommended as an "Over the
fender repair" Due to the long pilots on the reamer and tap,
there is a possibility of the pilot breaking off and falling into the
engine.
Before you proceed:
Make sure that the head is raised above the working surface at
least an inch or 25mm so that the pilots on the reamer and tap tools
have clearance as to not hit the surface below. If repairing on a work
bench this can be accomplished by using 2 short pieces of 2"x4" wood to
raise the head from the surface then secure the head in place.
Instructions are using a block of aluminum for better
viewing. This repair ca be done on the vehicle at your own risk.
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PAGE 1 |
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A:
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B:
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- Using the wrench provided, place the reamer into the
square of the wrench and tighten the set screw to secure the
reamer in place. The pilot on the reamer will keep the newly
reamed hole square to the original threads Picture A.
Ream the hole until the black stop collar bottoms out on
the hole and spins freely. This will create a countersink for
the flange of the insert.
Picture B .
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C:
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D:
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2. Using the wrench provided, place the tap into the square
of the wrench and tighten the set screw to secure the tap in place.
Picture C. Tap the hole to the full depth
permitted by the tool. The tap should "stop" or bottom out as it
comes in contact with the bottom of the newly reamed hole. Picture
D. |

E:
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F: |
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3. Using the wrench provided, place the
Driver into the square of the wrench and tighten the set screw to
secure the driver in place. Picture E.
Oil the bottom threads of the Driver tool with a few drops of driver
oil. Picture F. |
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G:
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H:
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4. Screw an insert onto the driver and into the newly
prepared hole. Picture G:
While screwing the driver into the insert you well feel the
driver start to tighten up, with a little more power continue
through the insert until it loosens up. The driver will cold
form the last few threads of the insert locking it in place.
Picture H.
Remove driver, repair is complete.
The new steel threads are now
square to the original spark plug hole.
Note:Technically the spark plug size on the 3 valve head
is a M15.5x1.5 which we consider a special M16x1.5.
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