Hopefully yours is sorted soon too
Ouch.
The bubbles are troubling. If none in the supply then most likely a cylinder gas leak into the injector fuel passages. You said the cups were re-cut so the injectors were out. This could have been an issue 100 hours ago. Could be simply a seal needing to be replaced. But cylinder gasses will definately mess up the fuel mix and make that racket.yep, I’d love to complain more but they’re the original injectors and 20+ years old so it happens. I do things in pairs so I’ll probably do the other side over the off-season next winter, I have no plans of getting rid of this boat.
Oh and thanks @Chris L for reminding me we have a multi-thousand dollar repair
Here is an FYI on the Cat injectors. My boat neighbor has been through three sets of injectors on his C18's. The external leakage has been so bad on the Cat rebuilds that he is getting high fuel in his oil sampling. I machined a test rig that we could install and pressurize the injectors and monitor/measure external leakage - I was amazed how much fuel leaks from the plunger - on all 12 injectors we tested. Some leaked much more than others. So be aware replacement injectors may not be the panacea you are thinking. We ended up selecting the best of the 12 tested for that engine.
Cat says all of the injectors (at least for the C18's) have an allowable external leak rate. All Cat has is rebuilds, at least when we were testing them. He knows the folks at Ringpower (our local Cat) and they provided the injectors at no cost for the replacements. The twelve we had was six pulled from the engine and six Ringpower gave him pending exchange. The Six pulled from the engine had less than 100 hours on them, that's when the oil samples showed fuel - again. I know he provided the data to them of the testing. He wanted new injectors but there are none available.
There is an annular space machined behind the fuel rail that we filled with fuel then pressurized over the fuel with compressed air.
Pretty slick. I dig it.
