GnrlPatton
Well-Known Member
- Jul 12, 2010
- 719
- Boat Info
- Current: 1998 370 Express Cruiser
Sold:1988 230 Weekender
- Engines
- Twin Cat 3116T
Had a mechanic out in March to replace my injectors on both engines. Starboard side went fine, port side had a bad injector from Cat, and was replaced on warranty. During the sea trial after all the work was done, I noticed that the port motor was hunting while at idle after being fully warmed up - like a good 20 minutes of full cruise after the oil (not just the coolant temp) is at cruise temp. I come down off plane, put engines at idle and then take it out of gear, and it happens,
My mechanic is stumped, he's been back at least 5 times to adjust the fuel rail (several times) clean the fuel supply line, remove the fuel rail and check the bushings (one was indeed loose and he replaced it) and (I did this one myself) replace the fuel filters. So far we've not been able to solve it, and his next idea is to replace the fuel governor, which I understand will be a fairly expensive operation as nobody around here rebuilds them. I thought I would post here to see if my CSR peeps have any ideas on it. Here's a video of it in action the first time around, it's fluctuating about 2-300 RPMs. It's not quite this bad now, maybe 50-100 RPMs, but still very noticeable.
Thanks,
Kevin
My mechanic is stumped, he's been back at least 5 times to adjust the fuel rail (several times) clean the fuel supply line, remove the fuel rail and check the bushings (one was indeed loose and he replaced it) and (I did this one myself) replace the fuel filters. So far we've not been able to solve it, and his next idea is to replace the fuel governor, which I understand will be a fairly expensive operation as nobody around here rebuilds them. I thought I would post here to see if my CSR peeps have any ideas on it. Here's a video of it in action the first time around, it's fluctuating about 2-300 RPMs. It's not quite this bad now, maybe 50-100 RPMs, but still very noticeable.
Thanks,
Kevin