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Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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My 4200 SCR port engine tops ot at 2500 rpm instead of 2600.

Customer Question

My 4200 SCR port engine tops ot at 2500 rpm instead of 2600. How can I adjust the throttle?
Submitted: 6 months ago.
Category: Boat
Expert:  Jason replied 6 months ago.
Hi Eric, my name is***** difference of 100 rpms is not likely to be a throttle cable adjustment. Which engine is in the boat? Has it ever made more than 2500 rpms in the past?
Customer: replied 6 months ago.
Cummins 450C. Yes it has made 2600 before.
Expert:  Jason replied 6 months ago.
When was the last time the fuse filters were changed out?
Customer: replied 6 months ago.
Not sure what those are.
Expert:  Joe replied 6 months ago.
Hello,Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today. I think he may have meant fuel filters. How does the prop look? Has anything been done, changed or modified since the last time it ran 100rpm more? Thanks,Joe
Customer: replied 6 months ago.
No, just the annual filters impellers and oil changes.
Expert:  Joe replied 6 months ago.
When you say the annual filters I presume you are referring to the fuel filters as well? Have you checked those fuel filters since this problem began? Have you checked the prop? Thanks,Joe

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