We have a Gemini
105mc with a Westerbeke
on it that we just bought. It is a 2003 and the engine
only has 325 hours or so (didn't get used much). It sat on the hard
for a year or so before we bought her. The engine
was acting weird on the survey
1. Idle rough
2. Some greyish smoke and leaving a little fuel
sheen on the water
3. But it ran well at higher rpms - 2500-3000 (max is about 3500 I think) even though it had the smoke.
4. It stalled a couple times at low rpms - idle shifting from forward to reverse.
We had a mechanic
look at it and they thought they had solved
this issue by doing the following:
1. Replaced a cracked metal return line off of the injectors (didn't solve it).
2. Replaced secondary fuel filter
(I don't know if the replaced the primary - assumed that the would but as you see below, I found water
in the bowl after running for 4 hours so now sure if they did).
3. Put in three new injectors to see if she ran good (one was bad, one was "wet", and the other fine so they are going to send off to be refurbished).
They thought it should be fine and just needed to be run for 4-5 hours to burn off the old fuel
in the cylinders that the clogged injectors were letting in (that should get rid of smoke and sheen)? I did that and it started behaving worse.
1. Now, it will not get past about 2200 rpm
and when it gets there, you get thicker black smoke and the exhaust
spits out black stuff in the water. This is with the new injectors.
2. Still smokes (more white) at lower rpms and still doesn't idle the best.
3. Stalled on my twice today at low rpms struggling at idle trying to shift from forward to reverse - awesome for my 2nd time ever docking
4. I checked the primary filter and it had some algae in it and about half of the bowl was water, so I think the fuel must be bad.
5. This has two tanks
and I realized someone had set up the tanks
to pull fuel from one and return to the other (so the return tank was totally full). I fixed this by doing it right and pushing and pulling from same tank but only after back at the dock
(not sure if this had anything to do with it).
So, the fuel definitely needs to be addressed (either with polishing or just removing it and putting clean fuel in it I assume). Can bad fuel cause these symptoms to happen? Does this sound like a more major problem? The mechanics are having a hard time with this so I would like to throw some ideas their way. I am also freaked out because I just closed on this boat a couple days ago and am afraid that the engine has a major problem here!
Oh, prop is clean and temperature is good - no overheating