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Ask Noel Schembri Your Own Question
Noel Schembri
Noel Schembri, Marine Technician
Category: Boat
Satisfied Customers: 1944
Experience:  Advanced technical diploma
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I'm Nick. I have a 1989

Customer Question

I have a 1989 Sea ***** ***** with twin 3208s. When I put the boat away last year, I had no problems. On my first voyage out this year, I noticed my starboard engine seems like the throttle is out of whack. I have to move the throttle significantly further to produce the same RPMs as the port engine and is maxing at about 1800 RPMs. All fluids and filters/seps are good, good water pumping and no leaks are evident. Also, no funny smells (turbo charger) or noticable difference in exhaust. Approximately 1050 hours on the engines. Is it possible the linkage slipped over the winter or do you think it could be something else?
Submitted: 1 year ago.
Category: Boat
Expert:  Noel Schembri replied 1 year ago.
Hello my name is ***** ***** I will assist you. I doubt the throttle linkage has slipped. What i would check first is the turbocharger pressure, make sure that it is boosting as the other engine. If it is then i would get the injectors cleaned as it looks it is starving for diesel.
Check the above and let me know.
Noel
Customer: replied 1 year ago.
Neither sounds like a very cheap solution.
Expert:  Noel Schembri replied 1 year ago.
To check the turbocharger pressure you just need to connect a boost gauge to your intake system. It is not an expensive thing to do but you need to start from there.
Noel
Customer: replied 1 year ago.
I am far from any kind of a mechanic, but will give it a try.
Customer: replied 1 year ago.
What should the pressure read?
Expert:  Noel Schembri replied 1 year ago.
it should be around 10-11psi. Have you also checked the fuel filter for any restrictions and contamination?
Noel
Customer: replied 1 year ago.
I did last night. I replaced the filter/sep and cleaned the can and replaced the secondary filters on each engine. The water sep can (bottom) had a some setiment, but the filters themselves looked ok.
Expert:  Noel Schembri replied 1 year ago.
Ok then next thing to check is the boost pressure under load. Ideally compare it with the other engine.
Noel
Customer: replied 1 year ago.
Ok. I just need to get a boost guage and figure out where to put it (lol). The service manual I downloaded doesn't give an illustration. I'll let you know how it goes.
Expert:  Noel Schembri replied 1 year ago.
Ok keep me updated
Noel
Customer: replied 1 year ago.
It seems that it is the hydraulic shifter. Pumped it a few times and worked a bubble out. Engine responded and 3k+ rpm. Going to drain the fluid and replace
Expert:  Noel Schembri replied 1 year ago.
Ok great, if you require further assistance let me know.
Noel
Customer: replied 1 year ago.
So the follow up to that would be...where do I add hydraulic fluid to the throttles? I want to take the old fluid out and replace so that it doesn't happen again. I've tried looking at schematics (again...I'm an accountant and not a diesel mechanic lol), but have been unable to find anything.
Expert:  Noel Schembri replied 1 year ago.
To do that job it is not that easy as you need special tools to bleed out air. At this stage i suggest you talk to a cat mechanic.
Noel

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