SCITOO 10pcs Seat Cutter Diesel Injector Set with Flat Reamer T-Handle Angled Reamer Hex Key Fit for Mercedes-Benz PSA Renault Bosch

Was skeptical due to the very low price - often, cheap machined tools are crap quality - but I'm quite happy with this.In case anyone is wondering like I was before I bought this, it fit my T1N Sprinter (2005)'s OM647 engine's injector bores just fine. Didn't exactly leave a mirror finish, but that's what a stick+glue+sandpaper are for :)

Worked perfectly. Cleaned the seats for the injectors nicely. Put some grease (small amount) on the cutting face and it'll collect any carbon/metal and prevent it from dropping into the cylinder.

So, the arbor that the reamers fit into isn’t exactly a precise fit, so the reamers don’t run concentric to the pilot on the tip of the arbor if the grub screw is cranked down all the way.In the Mercedes OM648 CDI application which is the 17mm flat face reamer (not the tapered one as the instructions suggest), it’s actually slightly less than 17mm. The sealing washer sits in a shallow counterbore at the bottom of the injector well to center it. The reamer will cut the top of the counterbore before cutting the seat. While this isn’t exactly ideal, if the seat actually needs reaming, the integrity of the counterbore is the least of your problems.

This might work for an aluminum head, but not for cast iron 7.3 idi. Couldn’t push hard enough under the hood to get it to bite. Maybe it would work if it was out and on an engine stand. Installed a magnet in the tip to catch shavings, but didn’t make any shavings to see if it worked. Too late for return, might sell it on eBay.

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Item worked great

Should do the job.