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I had to repair an engine where the thread of the locking screw for the manual timing chain tensioner was demaged.
For this I made a tool with which I can drill out the defective thread and replace it with a glued-in socket.
The RepKit essentially consists of two guide sleeves: One for drilling out the defective thread and pre-drilling to the core diameter for an M10x1.25 thread and one as a guide for the tap.
Here as an example the sleeve for boring to the bead wire diameter for cutting the thread:
The sleeves are centered through the hole in the rear engine cover and are pressed against the engine by a shortened clutch spring. Shown here on a "sacrificial cover" that was broken out for this purpose:
For drilling, the cover must be placed on the motor and fixed with 2 M8 screws on the left and right.
For cooling and lubrication when drilling in aluminum, the hole is flooded with ethyl alcohol or petroleum:
:
Since the drill chuck of the cordless drill or a drill with a size 10 chuck is too big at this point, a smaller chuck is clamped into the machine to make the pilot hole for thread cutting:
Next, the guide sleeve is exchanged for the one for the tap, the cover is put back on and the M10x1.25 thread is cut. Again, it should be well lubricated with ethyl alcohol or petroleum.
For this I made a tool with which I can drill out the defective thread and replace it with a glued-in socket.
The RepKit essentially consists of two guide sleeves: One for drilling out the defective thread and pre-drilling to the core diameter for an M10x1.25 thread and one as a guide for the tap.
Here as an example the sleeve for boring to the bead wire diameter for cutting the thread:
The sleeves are centered through the hole in the rear engine cover and are pressed against the engine by a shortened clutch spring. Shown here on a "sacrificial cover" that was broken out for this purpose:
For drilling, the cover must be placed on the motor and fixed with 2 M8 screws on the left and right.
For cooling and lubrication when drilling in aluminum, the hole is flooded with ethyl alcohol or petroleum:
:
Since the drill chuck of the cordless drill or a drill with a size 10 chuck is too big at this point, a smaller chuck is clamped into the machine to make the pilot hole for thread cutting:
Next, the guide sleeve is exchanged for the one for the tap, the cover is put back on and the M10x1.25 thread is cut. Again, it should be well lubricated with ethyl alcohol or petroleum.