Quote:
Originally Posted by gonesurfing
I just rebuilt mine with Firad nozzles. I have one nailing that follows the nozzle if swap cylinders. I disassembled it and it has light scoring in one area and doesn't seat well after popping. I also have one leaking at the half despite lapping it to a mirror finish with 2000 grit.
The bosch nozzles do pee if the pressure is applied too slowly. I think this is a "feature" of the drilled pintile.
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In old threads back in 2007-2008 I said where I worked we used 500 grit lapping compound. No one was interested and said it had to be a finer grit then that and I never argued the point. But I worked for 5 years in a fuel injection shop and in that time I must have done 100s of injectors during one year. Again we use 500 grit lapping compound but we had a real lapping plate.
When I no longer worked for the fuel injection shop and had to lap the parts inside of a Caterpillar Fuel Injection Pump at work I used Comet Cleanser and a piece of flat window glass. It worked fine.
When I rebuilt the Injectors on my Volvo Diesel and Mercedes I used a flat piece of glass again but bought 600 grit lapping compound from an eBay seller that sold stuff for polishing Rocks (I believe it was aluminum oxide) and that worked fine. It leaves that lapped area a light gray color and you can see any area that did not get lapped as it will not be that gray color.
Later I got a good deal on a lapping plate but have not used it for Injectors.
So you have nothing to loose by lapping the leaker with typical house hold Cleanser (bonamie is not gritty enough) like Comet or Ajax.