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1GM10 won't run over ~2500rpm

1945 Views 8 Replies 6 Participants Last post by cheoah, Aug 25, 2014

XPatriot

Discussion Starter · Aug 23, 2014

Here is what I know about the boat/engine:

-1gm10 w/410 hrs. Not sure of service history.
-boat sat from fall 2013 to May when I bought it.
-it had about 2/3 tank of diesel, I filled it in May and put fuel treatment in.
-I changed the oil, filter, tranny oil.

The engine starts and runs well, but won't rev over 2500rpm. It also surges a bit, at full throttle is remains at 2500rpm, and occasionally goes up to 3000 only to drop back down. Also, if I drop the revs, then 'gun' it, it will go above 2500 for a short time before dropping back.

I'm thinking some kind of fuel delivery problem....time to change the fuel filters? I drained the fuel filter today and fair bit of black particles came out....this also got air in the system so I know I have to bleed it next time.

Any advice/additional info. appreciated. Hoping it's not a big job!!!

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Mechsmith

· #8 · Aug 24, 2014

Rocketer, you are over propped, or have a plugged exaust. If a diesel smokes more than briefly it's being overloaded. This will either "tulip" the valves or put a hole in the piston sooner or later.

I have seen it happen a couple of times in my farm equipmment repair business. It will happen when the wind is on your nose and all you want to do is get home and you won't even notice the smoke in time. Fix it! It will blow at the most inopportune time.

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