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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3343
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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My 175 Optimax has just over 400 hours on it. Just recently,

Customer Question

My 175 Optimax has just over 400 hours on it. Just recently, after putting the motor into forward and moving for a few seconds, there will be a 'clunk' sound from the motor. Usually only does this once. Upon putting the motor in full throttle mode, everything is fine and there are no such noises.
Suggestions? I'm currently on vacation in Michigan's UP, with 10 days left on my trip.
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.
Hello, my name is***** you for allowing me to assist you today.
With the boat on the trailer and the throttle in Neutral, if you spin the prop, is it clean or do you hear it ratchet?
Customer: replied 1 year ago.
Clean. Also checked lower unit lube and it is good. No metal shavings
Customer: replied 1 year ago.
After further check may have been some mo or shavings
Expert:  Charles replied 1 year ago.
What is the RPM when you hear the clunk sound?
Customer: replied 1 year ago.
No idea other than its just into gear moving at its slowest speed. When I put the boat on the trailer instead of the clunk, there was grinding, like when you don't pop the engine in gear.
Expert:  Charles replied 1 year ago.
Have you adjusted the shift cable recently?
Customer: replied 1 year ago.
No I have not.
Expert:  Charles replied 1 year ago.
this is what I am felling right now, you need to adjust the cable to that it travels more to the FWD direction, when you are bring up the throttle, the shift cable is still moving, just before the throttle advances, you actually get FWD. Remove the cable barrel from its holder, turn the Ferrel 3 turns toward the end of the cable. Reinstall everything and see if the shift is better, if not adjust it again. These cables do stretch over time.
Let me know how it goes.
Customer: replied 1 year ago.
Thank you so much. Will try first thing in the AM.
Expert:  Charles replied 1 year ago.
Remember that FWD is forward on the shift selector.
I will be back online after 530 PM CST. Look forward to talking to you then.
Customer: replied 1 year ago.
Thanks for your help. Found a Merc dealer about 90 miles away. They adjusted the cable and it appears to have fixed the problem.
Expert:  Charles replied 1 year ago.
Glad that it was something simple. Have a great rest of your trip.
If you are happy with my service to you, please put forth a positive rating for me.
Thanks in advance,
Charles
Customer: replied 1 year ago.
Will do, sir.
Expert:  Charles replied 1 year ago.
Thank you very much.

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