Hi all. Just seeking advice on injector seal change on my pd170. Bmn engine. Im handy with tools so not worried in that respect. Im just asking if there is anything to be wary of before I venture into changing them or if there is any guides on how to do them for my specific engine

The main things to watch on the BMN, going by the workshop procedure for that engine:

- **Get the right bits before you start.** The seal kit (heat shield/washer and O-rings), plus new clamp bolt and rocker shaft bolts, because they're stretch bolts. Worth getting new ball studs and adjusting screws for the rockers as well, as the procedure says to replace them.

- **Before you take anything apart,** if you have VCDS, record the injector balance values (measuring block 013) so you can compare afterwards.

- **Getting them out:** the rocker shaft needs to come off evenly, and a stuck injector needs the proper slide hammer puller. Don't lever on the solenoid or the connector. Suck the fuel out of the bore before the new one goes in.

- **O-rings:** lubricate lightly and fit them without rolling or twisting, otherwise you'll get fuel in the oil later.

- **Refitting:** the injector has to be pushed square into its seat with the clamp while you tighten. If it isn't, it won't seal properly.

- **Rocker adjustment:** this is the bit people get wrong. The adjusting screw is set with a dial gauge against the injector after fitting, and the procedure is specific to the engine. Get the workshop data for the BMN for this step and the torque figures, and don't copy figures from the 8v PD or the common rail engines, as they're different.

Afterwards, prime the fuel, check for leaks, check the balance values again, and keep an eye on the oil level for the first few hundred miles in case an O-ring is leaking fuel into the oil.