How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Cat Man Your Own Question
Cat Man
Cat Man, Cat Engine Expert
Category: Boat
Satisfied Customers: 8725
Experience:  23 years Caterpillar Engine Experience
30708357
Type Your Boat Question Here...
Cat Man is online now
A new question is answered every 9 seconds

I own a 2007 defever 50' cockpit with twin C7 asert 450hp,

Customer Question

I own a 2007 defever 50' cockpit with twin C7 asert 450hp, port engine at idle up to 1100 rpm free wheeling rpms ,engine has a distinct sound coming from the air cleaner element. the sound its making would spell out like this, booboobooboo and as the rpms go up the sound speeds up untill 1100 plus and vanishes ?
Submitted: 1 year ago.
Category: Boat
Expert:  Cat Man replied 1 year ago.

Thanks for asking your question. I will try and help you out.

It sounds like you may have an intake valve not sealing. I have seen this before. When this happens there will be a popping noise in the air cleaner. To repair, the head would have to come off and then valve repaired. I am sorry. I wish I had better news.

Please reply back if you need more help or have more questions. I am happy to assist.

Customer: replied 1 year ago.
Low hours on the engine and when cranking over there is no sound differance in the rotating the engine like if one cylinder was low compression . Are these engines hydronic or mechanical adjusted valve terraine ? I'm hopeing a thought intake valve . Or even a possible bearing failure in the turbo and turbo cartridge noise ?
Expert:  Cat Man replied 1 year ago.

Thanks for asking your question. I will try and help you out. This engine has a mechanical valve train. I would definetely check this first. You may have a kid adjustment or bent push tube.

Not common for a turbo to make this noise. Normally when they have a problem. They fail by breaking the shaft or end wheel.

Please reply back if you need more help or have more questions. I am happy to assist.

Expert:  Cat Man replied 1 year ago.

Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

Related Boat Questions