Well i've now bench run the 170 cdi to diagnose. Two times, the fuel line on the pressure side of the pump burst open right after startng!! That is the first time ever I've seen that happen. Twice!!.<div>It then settled down, and ran. Though I initially found myself chasing the regulator settings. I could not get a reliable idle. It would settle to an idle and then sag down and go very rich and shut down. Adjusting the regulator gave mixed results. However, it has now settled down to an idle of around 1800. It does sag slightly from there about 200 rpm or so, but atleast I can advance the throttle without it cutting out. </div><div>
</div><div>When I removed the regulator, I found two silicone gaskets. One orange, and one black, which was in front of the orange one. So i removed the black one and test ran the engine again. As expected, I then had to wind the regulator in to compensate for the removed 'extra' silicone gasket. the engine seems a little better since. </div><div>More questions:</div><div>1. What are you're main needle settings</div><div>2. What are your regulator settings</div><div>3. What idle do you set at.</div><div>4. Will your engine settle to an idle and the rpm stays within +/-100rpm of that idle setting, for a prolonged period?</div><div>5. Are there supposed to be two silicone gaskets behind the regulator, or just one?</div><div>
</div><div>I think ultimately, I need to replace seals/gaskets on this engine. </div><div>
</div><div>The engine is ok to fly, but i can see it giving me headaches at the field.</div><div>
</div><div>We'll see. </div><div> </div>