GQ Injector replacement

Angelo,

All injectors for the TD42 engine are the same except for the very latest which has a sensor on no:1 for the timing correction.

They need a torque setting, its in the workshop manual.

They need bleeding although some people just crank it until it starts, the way to do it is crack open the piping (at the injector end) and crank it until you see diesel coming out on all, then close it and start it up, but don't rev it, it will missfire until all air has been pushed out of the injectors, let it idle and stabillise.

Would recommend new but they are very expensive, reco exchange is OK though.

Will

I recently installed some changeover Hi-flo injectors. They were $442 for the set,which included all the copper washers needed to install them.Only took about an hour and a half fit.

Champion ..thanks so much mate.

There is no physical difference with turbo to non turbo. The torque setting as per the book for the injector to the head is 54 - 64 Nm. You will need to by a tube socket though so you can do them up. They need to be bled by cracking the line at the injector and cranking the engine over until all the air is purged. The injector flare nut needs to be torqued to 20 - 25 Nm. The bleed off line is torqued to 29 - 39 Nm. I used to have a Safri Turbo Intercooled GQ, running around 16psi boost. One thing I was very particular about was the crack pressure. There is a company I used called Disel Tech, in Springwood QLD, and they would set all the injectors at 120 Bar by request. This is around 20 more than standard, (standard crack pressure is 100 to 105 bar), but it helps with better atomisation due to the increased combustion chamber pressure at higher boost. Even with a naturally aspirated engine, the crack pressures can be increased slightly (105 - 108ish bar) as this will help atomisation of the fuel in the pre combustion chamber. But more importantly , make sure they all crack at the same pressure, whatever you get them set to. I hope this helps you.