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thought I would do a quick write up / how to on the following seeing as im doing one today
ok the car in question has a broken ringland which has lightly marked the cylinder wall so we are replacing the piston with another s/h good piston and fitting new rings to it.
the write up is not on how you do the job but on how to hone the cylinder without snapping the oil squirter which will be a nightmare to change with the crank and cradle fitted.
to do the job you will need an old piston that's no good (maybe the one you've just removed) youll need to cut it down with a grinder and remove the dish on top so its completely flat. you only need to cut down one side of the piston so that it sits on top of the oil squirter and protects it from the honing tool which is the purpose of this thread.
drill 2 holes through the top so you can lower it down and lift it out carefully with a long nosed pair of pliers as the squirters are very fragile and can break easily.
heres one I made which can be used time and time again
place this into the cylinder like so
you can then start the honing / deglazing process of that cylinder
use the drill speed at a relatively slow speed once honer attachment is installed.
lightly coat the cylinder walls with some light oil to aid the process and stop any burning.
youll need to move your arm up and down to match the speed of the drill to give you 45 to 60 degree cross hatchings (such as in above photo) DO NOT just allow the honer to spin at speed in the cylinder as this will deglaze it for sure but it will leave horizontal lines in the walls which will make it extremely difficult for the new rings to bed in properly if not impossible and it could actually damage your new rings.
once the process is complete remove the tool covering the oil squirter then clean all the cylinder with someclean rag then pre-oil it prior to fitting the replacement piston and rings, also make sure the crank journal is spotlessly clean prior to refitting the rod and bearings
that's about it
ok the car in question has a broken ringland which has lightly marked the cylinder wall so we are replacing the piston with another s/h good piston and fitting new rings to it.
the write up is not on how you do the job but on how to hone the cylinder without snapping the oil squirter which will be a nightmare to change with the crank and cradle fitted.
to do the job you will need an old piston that's no good (maybe the one you've just removed) youll need to cut it down with a grinder and remove the dish on top so its completely flat. you only need to cut down one side of the piston so that it sits on top of the oil squirter and protects it from the honing tool which is the purpose of this thread.
drill 2 holes through the top so you can lower it down and lift it out carefully with a long nosed pair of pliers as the squirters are very fragile and can break easily.
heres one I made which can be used time and time again
place this into the cylinder like so
you can then start the honing / deglazing process of that cylinder
use the drill speed at a relatively slow speed once honer attachment is installed.
lightly coat the cylinder walls with some light oil to aid the process and stop any burning.
youll need to move your arm up and down to match the speed of the drill to give you 45 to 60 degree cross hatchings (such as in above photo) DO NOT just allow the honer to spin at speed in the cylinder as this will deglaze it for sure but it will leave horizontal lines in the walls which will make it extremely difficult for the new rings to bed in properly if not impossible and it could actually damage your new rings.
once the process is complete remove the tool covering the oil squirter then clean all the cylinder with someclean rag then pre-oil it prior to fitting the replacement piston and rings, also make sure the crank journal is spotlessly clean prior to refitting the rod and bearings
that's about it
