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Old 05-27-2020, 09:26 AM   #21
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Originally Posted by Bcg View Post
White/grayish smoke is too much air, not enough fuel.

No, not on a diesel. An under-fueled diesel will just make limited power, but it won't smoke.
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Old 05-27-2020, 03:54 PM   #22
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City: Corpus Christi, Tx
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Originally Posted by rslifkin View Post
No, not on a diesel. An under-fueled diesel will just make limited power, but it won't smoke.
That's often true but, not always. I've got about a dozen diesel motors around here in vehicles, tractors, construction equipment, generators, etc. I have seen a clogged fuel filter produce some whitish smoke at the top of the RPM it'll get to with the reduced fuel. In fact, Sunday I got stranded by my Ford 6.7 because of a clogged fuel filter and it was producing some white smoke under load. That filter only had about 8,000 miles on it and, stupidly, I didn't have a spare in the truck so it resulted in a 5 mile round-trip walk to get one. I've got a spare now.

I've also blown turbos or had charge pipes pop off and you get copious amounts of black smoke when that happens, there's no mistaking it, along with NO power.

Anyway, what I've learned in maintaining all these motors is that 95% of problems with a diesel are fuel (which includes dirty fuel plugging a filter, by far the most commy), 4.9% are fuel system (injectors, injector pump, etc., also caused by bad fuel) and the other 0.1% are something else. This is hyperbole but, not far from reality.

I've had one actual motor problem out of all of them and that was a failed liner o-ring on a 1989 International DTA360 caused by the coolant not being right.

I've got a couple of Deere motors with over 6500 hours on them, one in an air compressor and one in a boom lift, neither have had any issues that weren't fuel related. So, it's smart to always start with the fuel and the fuel filter and, despite my failure to do so in the truck, to always have extra filters on hand.
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Old 06-10-2020, 02:46 PM   #23
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Came down to the boat today and the mechanic was onboard with the boat running. He had it in reverse pushing against the large pad i have at the back of the dock, indicated he had rev'd it pretty hard for 15 min with no smoke or issue. Told me to add some fuel additive and then take it out and run at 3000 RPM for a while to discharge any crap on the turbo and just keep an eye on things. Which we will do this weekend.

I have a Yanmar specialist scheduled to come out on the 30th (first available day) and will hold the appointment for now just in case but hopefully we are good. Fortunately)unfortunately the weekend weather has been lousy so we have not missed much.

Thanks to all for the feedback and insight.

cheers
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