Franknstein
New Member
- Messages
- 29
- Location
- Milton Keynes, UK
Hello all. I'm after some advice. I have an old BMW with a M57 Common rail diesel engine. I've had to pull the injectors in order to replace the valve cover gasket. Managed to get 5 of the 6 injectors out, but the 6th one broke during extraction. I've attached some photos.
My plan is drill the remnants of the injector from out of the cylinder head with a Cobalt HSS Blacksmith bit on an air-drill, using a drill guide I fabricated to bolt onto the head to keep the drill bit centred. My concern is that where the sleeve part of the injector has broken off in the head - is a little jagged on the top - I'm concerned about the interrupted cut that the drill bit will have to make - its a large bit (16,5mm). If I get as far as the bottom I will probably have to regrind the drill bit down to a much shallower angle too in order to avoid breaching into the cylinder head.
Basically I'd love to know anyone's thoughts on whether my plan is likely to work or if you have any thoughts on how I can lower the risks of failure.
Also, does anyone have any ideas as to how I can prevent swarf getting into the combustion chamber through the 7mm hole?
My plan is drill the remnants of the injector from out of the cylinder head with a Cobalt HSS Blacksmith bit on an air-drill, using a drill guide I fabricated to bolt onto the head to keep the drill bit centred. My concern is that where the sleeve part of the injector has broken off in the head - is a little jagged on the top - I'm concerned about the interrupted cut that the drill bit will have to make - its a large bit (16,5mm). If I get as far as the bottom I will probably have to regrind the drill bit down to a much shallower angle too in order to avoid breaching into the cylinder head.
Basically I'd love to know anyone's thoughts on whether my plan is likely to work or if you have any thoughts on how I can lower the risks of failure.
Also, does anyone have any ideas as to how I can prevent swarf getting into the combustion chamber through the 7mm hole?