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post #1 of 7 Old 11-17-2017 Thread Starter
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oday 30 - universal 20hp issue

Hello all. I have an 84' oday 30 sloop with a universal M3-20B. About a week ago I noticed that I was giving it more throttle when in gear and the engine didn't repond, wouldn't go above 2k RPMs. Runs fine in netural but under laod it dies down and emits a nasty black looking soot in the exhaust water. Any suggestions? Any one else have this happen?
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post #2 of 7 Old 11-17-2017
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Re: oday 30 - universal 20hp issue

Black soot means a very rich fuel to air mixture typically. Start with the air filter and ensure you are getting appropriate airflow. Then move onto your injectors ensure they are clean and the nozzles don't look worn. Installing new ones might be required. I haven't done much work on diesels but lots on old motorcycle gas engines. If the problem persists then I would go with a compression test.
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Re: oday 30 - universal 20hp issue

Thank you. I had the injectors tested a shop today and they are fine, no issues with the air intake either. I also had a local mechanic provide some guidance and he didn't perform the compression test but said the resistance when turning the crank showed compression was good.......I don't know. will let ya all know what comes of it
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Clean your exhaust elbow.


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Re: oday 30 - universal 20hp issue

Thank you I will definitely do that, let you know how it goes.
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Re: oday 30 - universal 20hp issue

What's your running gear look like? Any chance it is loaded up with creepy crawlers?

Catalina 34
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post #7 of 7 Old 11-18-2017
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Re: oday 30 - universal 20hp issue

Quote:
Originally Posted by eherlihy View Post
Clean your exhaust elbow.
Yes, that's my thought as well gotta be an exhaust issue.

Scott
s/v Karma
Short Pump, VA
1981 O'Day 34
"No matter where you go, there you are."
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