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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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4 cylinder penta has knocking sound and loss of power at s

Customer Question

4 cylinder penta has knocking sound and loss of power at speed.
Submitted: 2 years ago.
Category: Boat
Expert:  Tan replied 2 years ago.
Hello. My name is Tan. I know it is a 4 cylinder but what model of the 4 cylinder they have many different models so I need the engine model number please? Have you pulled the spark plugs and checked for water and done a compression test.
Customer: replied 2 years ago.
230A- no to question
Expert:  Tan replied 2 years ago.
Ok we need to start with a compression test and checking the spark plugs. Has the engine been over heated?When was the last time you had the engine tuned up.How old is the fuel you are running in the engine?
Customer: replied 2 years ago.
not over heated-been running all season-can test tomorrow
Customer: replied 2 years ago.
sounds like rod knock
Expert:  Tan replied 2 years ago.
That's not good. The compression test may tell us right away as you are loosing power it could be a piston issue or water in a cylinder. What does the engine oil look like color wise?
Customer: replied 2 years ago.
its my sons boat-I need him with me at the boat to answer-could we reconnect tomorrow?
Expert:  Tan replied 2 years ago.
Ok great yes just post back as you have been and I will get your reply.Thyanks.
Customer: replied 2 years ago.
will do -thank you
Expert:  Tan replied 2 years ago.
Your welcome.

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