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Old 14-08-2016, 13:30   #16
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Re: diesel slow to accelerate?

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Originally Posted by sailorchic34 View Post
Check the discharge elbow for carbon buildup. That can cause a diesel not to rev.
I think sailorchic34 is right on target. I had the same symptoms you described with my Yanmar 3GM30 and 3 different Yanmar dealers told me to check the mixing elbow in the exhaust system. I checked it and found it was almost completely blocked. Apparently this is a common occurrence with Yanmar engines. If the engine can't get rid of the exhaust it can't breathe and loses power.
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Old 14-08-2016, 15:30   #17
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Re: Diesel slow to accelerate?

I assuming "slow to accelerate" means the engine RPM is slow to increase.
OPs engine is a Yanmar turbo.
Exhaust elbow or more likely turbo
here's a DIY link to check the turbo
Marine turbo chargers, love them or hate them they are here to stay
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Old 15-08-2016, 03:53   #18
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Re: Diesel slow to accelerate?

thanks for all the good input. I meant that the engine was slow to increase RPM's, not that the boat itself was slow to increase speed through the water. We put a new mixing elbow on her two years ago, but I suppose it could be obstructed.
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Old 15-08-2016, 04:02   #19
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Re: Diesel slow to accelerate?

Good luck with the repairs. Let us know what you find.
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Old 15-08-2016, 04:09   #20
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Re: Diesel slow to accelerate?

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Originally Posted by briblack View Post
thanks for all the good input. I meant that the engine was slow to increase RPM's, not that the boat itself was slow to increase speed through the water. We put a new mixing elbow on her two years ago, but I suppose it could be obstructed.
With or without a load? In gear or in neutral? When was the last time the bottom and prop were scaped and cleaned?

Without answers to these very basic questions, nobody can give you a good suggestion as to the source of your problem.
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Old 15-08-2016, 04:33   #21
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Re: Diesel slow to accelerate?

I totally agree! Troubleshooting is a logical step by step investigation based on inspections and testing. Short of that it's just guessing. Guessing can be a very expensive way to fix an engine.
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