Injector pump

[Johno]

G day all, I had anybody adjusted the max fuel adjustment on there 4BDI, I realize that it is locked by wire, however I just reckon my engine lacks a little power under load. Done a compression test all good, thinking about winding the screw out half a turn, give her a bit more fuel. Any advice would be appreciated JOHNO

[BEARMAN]

Before you adjust the fuel screw make sure you have an EGT gauge so you can monitor the combustion temperatures. You don't want to melt a piston. Usually adjusting it out 1 turn will produce a noticeable improvement but a larger exhaust in combination with a fuel increase will give a better result.

[Johno]

Thanks Bearman, I rarely have the engine under full load, it’s just that I have noticed when traveling with other Perenties mine lacks a little on long hills. Good engine does not smoke or use oil. Compression test OK. I have turned the screw out half a turn, which moved the screw about 3/4 of a millimeter. I will see how she performs. I suppose what I am doing is moving the rack open a bit more, giving her a bit more fuel? Thanks for advice mate. Johno

[john.k]

Small increase in fuel delivery may make lots of black smoke ,and earn you a smoke notice from the RTA........You certainly wont melt pistons or anything else ,diesels dont work that way.

[asmit]

Yes you certainly can melt pistons, Diesels run a hotter combustion temperature when they run a fuel rich mixture.

I would be very careful adding more fuel than standard to a N/A diesel.