Completely rebuilt 310T, all the updates, all rotating parts balanced, crank blue printed no holds barred in this. Injection pump was completely rebuilt, except for the head in the pump which was good and well with in specs. New injectors. Has about 15 hours on it, plowing heavy clay with 5 year old alfalfa, and did very well.
At 720 rpm it runs perfect, and over 875 it runs perfect, or sounds like it anyway, and no smoke. In between, increasing the rpm, it will smoke a little and the exhaust is very sharp, possibly a miss but maybe just each fire more prominent. But, if you take it up to 900 or higher, and let it run a few minutes or so there, then decrease the rpm to between 720 & 875, it wont repeat the symptom for 3-4 minutes. This one is timed at 1 BTDC. Anyone have any thoughts as to why? Is there a scenario in the pump advance or fuel preasure in the pump that can cause this?
At 720 rpm it runs perfect, and over 875 it runs perfect, or sounds like it anyway, and no smoke. In between, increasing the rpm, it will smoke a little and the exhaust is very sharp, possibly a miss but maybe just each fire more prominent. But, if you take it up to 900 or higher, and let it run a few minutes or so there, then decrease the rpm to between 720 & 875, it wont repeat the symptom for 3-4 minutes. This one is timed at 1 BTDC. Anyone have any thoughts as to why? Is there a scenario in the pump advance or fuel preasure in the pump that can cause this?